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<div dir="ltr" align="left"><span class="710364120-16032012"><font color="#0000ff" size="2" face="Arial">Thank you very much for all the efforts, Paul.</font></span></div>
<div dir="ltr" align="left"><span class="710364120-16032012"><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span class="710364120-16032012"><font color="#0000ff" size="2" face="Arial">Regards,</font></span></div>
<div dir="ltr" align="left"><span class="710364120-16032012"><font color="#0000ff" size="2" face="Arial">Alex</font></span></div>
<br>
<div dir="ltr" lang="en-us" class="OutlookMessageHeader" align="left">
<hr tabindex="-1">
<font size="2" face="Tahoma"><b>From:</b> nvmewin-bounces@lists.openfabrics.org [mailto:nvmewin-bounces@lists.openfabrics.org]
<b>On Behalf Of </b>Luse, Paul E<br>
<b>Sent:</b> Friday, March 16, 2012 1:38 PM<br>
<b>To:</b> nvmewin@lists.openfabrics.org<br>
<b>Subject:</b> Re: [nvmewin] Learning Mode Patch for Review<br>
</font><br>
</div>
<div></div>
<div class="WordSection1">
<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">You know what, you’re right.<span style="mso-spacerun: yes">
</span>I was thinking we had a match on the CQ side even after learning which is the case for making sure that we’re building the table such that, after learning, our DPC knows exactly which queue to look in w/o searching them but we’re not NUMA optimized on
the CQ at that point.<span style="mso-spacerun: yes"> </span>Missed the forest for the trees there for a minute but there are a lot of trees
</span></font><font color="#1f497d" size="2" face="Wingdings"><span style="FONT-FAMILY: Wingdings; COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-char-type: symbol; mso-symbol-font-family: Wingdings"><span style="mso-char-type: symbol; mso-symbol-font-family: Wingdings">J</span></span></font><font color="#1f497d" size="2"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><span style="mso-spacerun: yes">
</span>I believe I can address this pretty quick and easy and it will actually be equivalent in attributes to when we had physical more and MSI address
<span class="SpellE">decomp</span> as our method.<span style="mso-spacerun: yes">
</span>Not today though, have to head out soon but little, if any, of this code will change I just need to go ahead and add code early on where we submit the N test IOs and then re-do the queues and turn off learning.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Thanks for giving this some extra thought!<span style="mso-spacerun: yes">
</span>Look for a new patch early next week…<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Thx<br>
Paul<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="COLOR: #1f497d; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<div>
<div style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt; FONT-WEIGHT: bold; mso-fareast-font-family: 'Times New Roman'">From:</span></font></b><font size="2" face="Tahoma"><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">
Chang, Alex [mailto:Alex.Chang@idt.com] <br>
<b><span style="FONT-WEIGHT: bold">Sent:</span></b> Friday, March 16, 2012 10:50 AM<br>
<b><span style="FONT-WEIGHT: bold">To:</span></b> Luse, Paul E; nvmewin@lists.openfabrics.org<br>
<b><span style="FONT-WEIGHT: bold">Subject:</span></b> RE: Learning Mode Patch for Review<o:p></o:p></span></font></p>
</div>
</div>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 11pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="blue" size="2" face="Arial"><span style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">Hi Paul,</span></font><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="blue" size="2" face="Arial"><span style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">I have a question regarding the Learning Mode. When you finish the learning and find out the mappings between cores and
vectors, do we need to delete the created Completion Queues and re-create them? When the driver creates the Completion Queues before learning, it specifies the associated vector for each Completion Queue with some assumptions in mappings between Completion
Queues and vectors. After the learning, the associations between Completion Queues and vectors need to be corrected via deleting the queues and re-creating them. Correct me if I am wrong.</span></font><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="blue" size="2" face="Arial"><span style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">Thanks,<br>
Alex</span></font><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p> </o:p></span></font></p>
<div style="TEXT-ALIGN: center" class="MsoNormal" align="center"><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">
<hr align="center" size="3" width="100%">
</span></font></div>
<p style="MARGIN-BOTTOM: 12pt; mso-outline-level: 1" class="MsoNormal"><b><font size="2" face="Tahoma"><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</span></font></b><font size="2" face="Tahoma"><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
<a href="mailto:nvmewin-bounces@lists.openfabrics.org">nvmewin-bounces@lists.openfabrics.org</a>
<a href="mailto:[mailto:nvmewin-bounces@lists.openfabrics.org]">[mailto:nvmewin-bounces@lists.openfabrics.org]</a>
<b><span style="FONT-WEIGHT: bold">On Behalf Of </span></b>Luse, Paul E<br>
<b><span style="FONT-WEIGHT: bold">Sent:</span></b> Friday, March 16, 2012 9:42 AM<br>
<b><span style="FONT-WEIGHT: bold">To:</span></b> <a href="mailto:nvmewin@lists.openfabrics.org">
nvmewin@lists.openfabrics.org</a><br>
<b><span style="FONT-WEIGHT: bold">Subject:</span></b> [nvmewin] ***UNCHECKED*** Learning Mode Patch for Review<br>
<b><span style="FONT-WEIGHT: bold">Importance:</span></b> High</span></font><font size="3" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></span></font></p>
<p class="MsoNormal"><i style="mso-bidi-font-style: normal"><font size="2" face="Calibri"><span style="FONT-STYLE: italic; FONT-SIZE: 10pt; mso-bidi-font-family: Calibri; mso-bidi-font-style: normal">Note that I merged Alex’s patch in here as it’s still pending
with Ray but is only a half-dozen lines of code so rather than have Ray create to tags and do 2 merges I just rolled them together so Ray can just process one patch.<span style="mso-spacerun: yes">
</span>Normally wouldn’t recommend this but the pending patch is so small it just makes sense.<o:p></o:p></span></font></i></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Password is ofanvme123.<span style="mso-spacerun: yes">
</span>I can schedule a call to walk through any of this if anyone would like.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><b style="mso-bidi-font-weight: normal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; FONT-WEIGHT: bold; mso-bidi-font-family: Calibri; mso-bidi-font-weight: normal">Learning Mode:</span></font></b><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><span style="mso-spacerun: yes">
</span>Pretty easy, its only enabled if we’re in an optimal config wrt cores/queues/vectors.<span style="mso-spacerun: yes">
</span>Assume we have N processors, it works like this…. On startup the first N IOs will be sent to queue # 1..N sequentially.<span style="mso-spacerun: yes">
</span>Each queue is created with a matching MSI ID so in this manner we assure to hit every queue and every message ID by incrementing the queue # for the first N IOs regardless of the submitting core.<span style="mso-spacerun: yes">
</span>On the completion side we simply look at the core that we completed on and update the table for the completing core such that the correct queues are used the next time an IO submits to this core.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><b style="mso-bidi-font-weight: normal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; FONT-WEIGHT: bold; mso-bidi-font-family: Calibri; mso-bidi-font-weight: normal">Testing:
</span></font></b><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">(in all cases I confirmed functionality<b style="mso-bidi-font-weight: normal"><span style="FONT-WEIGHT: bold; mso-bidi-font-weight: normal">
</span></b>and via iometer and<b style="mso-bidi-font-weight: normal"><span style="FONT-WEIGHT: bold; mso-bidi-font-weight: normal">
</span></b>xperf I confirmed core load balancing)<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Chatham (DT with 8 cores):<span style="mso-spacerun: yes">
</span>Win8 Server public beta, 2008R2<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">QEMU (configured for 2 cores): Win7-64<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Tools:<span style="mso-spacerun: yes">
</span>The standard stuff:<span style="mso-spacerun: yes"> </span>format, stress, iometer, SCSI compliance, shutdown/restart<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><b style="mso-bidi-font-weight: normal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; FONT-WEIGHT: bold; mso-bidi-font-family: Calibri; mso-bidi-font-weight: normal">Changes:<o:p></o:p></span></font></b></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">nvmeStd.h:
<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Comment changes as needed<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Removed the logcalmode element from the msgTable as its no longer used<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Removed DBG directive from procNum element, its now required for learning mode<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Removed proto for NVMeMsixMapCores, not used anymore (combined MSI and MSIX routines, more later)<o:p></o:p></span></font></p>
<p class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p style="MARGIN-LEFT: 0in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">nvmeIo.c:<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Removed DBG directive from procNum element, its now required for learning mode<o:p></o:p></span></font></p>
<p class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p style="MARGIN-LEFT: 0in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">nvmeInit.c<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Removed NVMeSwap(),NVMeQuickSort(),NVMeMsixMapCores() as they’re no longer used<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Changes to NVMeMsiMapCores():<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in; MARGIN-LEFT: 1in" class="MsoListParagraph"><font size="2" face="Courier New"><span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Courier New'">o</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt; mso-fareast-font-family: 'Courier New'">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Set the initial core table MsgID to the CplQ number, this is needed so that we can determine the CplQ from the MsgId during learning mode while in the DPC/ISR<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in; MARGIN-LEFT: 1in" class="MsoListParagraph"><font size="2" face="Courier New"><span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Courier New'">o</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt; mso-fareast-font-family: 'Courier New'">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">The other changes are just code simplifications
<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Changed NVMeCompleteResMapTbl() to use NVMeMsiMapCores() for either MSI or MSIX<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Changed NVMeMapCore2Queue():<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in; MARGIN-LEFT: 1in" class="MsoListParagraph"><font size="2" face="Courier New"><span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Courier New'">o</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt; mso-fareast-font-family: 'Courier New'">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">We now check if we’re in learning mode, if not then we simply look up the queue num from the core table<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in; MARGIN-LEFT: 1in" class="MsoListParagraph"><font size="2" face="Courier New"><span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Courier New'">o</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt; mso-fareast-font-family: 'Courier New'">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">If we’re in learning mode (based on a simple count of how many cores we’ve learned vs total available cores), then we use the core number that we’re on (that we’re learning)
+ 1, the +1 is because all queue numbers are core+1 by our convention<o:p></o:p></span></font></p>
<p style="TEXT-INDENT: -0.25in" class="MsoListParagraph"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">-</span></font><font size="1" face="Times New Roman"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 7pt">
</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Change in NVMeAllocIoQueues() to effectively disable learning mode if we only have 1 queue (it makes no sense and actually causes problems for learning mode if we don’t
do this).<span style="mso-spacerun: yes"> </span>We disable it by pretending that we’ve already learned all the cores<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">nvmeStd.c:<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">In NVMePassiveInitialize(), disable learning mode is we’re sharing one MSI over multiple queues, same reasons as when we hae one queue<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">In NVMeInitialize():<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Enable DPC perf opt per Msft recommendation to steer stoport completion DPCs back to the submitting core<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">In NVMeStartIo() – bug fix unrelated to learning mode but I found it while debugging learning mode (via BSOD).<span style="mso-spacerun: yes">
</span>You can’t return FALSE from this function per MSDN docs.<span style="mso-spacerun: yes">
</span>Always return TRUE<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">In IoCompletionDpcRoutine() and same changes in the ISR when its enabled for completions instead:<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Merged Alex’s bugfixes in with my changes<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Removed the DBG related code for checking core affiliation<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Where we decide which queues to check, I set a Boolean to determine if we’re learning or not to FALSE if we’re in shared mode because we disable learning mode during init
if that’s the case<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">If we’re not shared, the learning Boolean is set based on how many cores we’ve learned and whether the MsgId is >0 as MsgId 0 is admin and we exclude that from learning
mode<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">If we’re not learning then, we only search the queue specified in the MMT<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">If we are learning, we know the queue # is the same as the MsdId because we init’d it that way<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">The ‘learning’ happens in a new coniditonal just after we determine we have an srbExt.<span style="mso-spacerun: yes">
</span>It works as follows:<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Grab the startIO lock as we’re sharing the core table with startIO and during learning mode we’re not yet assured that start/complete are on the same core.<span style="mso-spacerun: yes">
</span>Note the lock is only taken on IOs during learning mode (the first few IOs)<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Lookup the CT entry for the core that we’re completing on and set its queue numbers to queue number that was associated with the IO that just completed.<span style="mso-spacerun: yes">
</span>This assures that the next lookup in the table for this core # will complete on this, the same, core.<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Increment our learning counter which will direct the next IO to the next core<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri">Unrelated changes to NVMeProcessIoctl(): A few changes were made here as the routine assumed every IOCTL we’d get would be a PT IOCTL making it difficult for venders to
add additional private IOCTLs.<span style="mso-spacerun: yes"> </span>Just moved things around a bit as we had to add one to our product specific code.<span style="mso-spacerun: yes">
</span>No other changes here other than placing IOCTL specific code in the correct case block<o:p></o:p></span></font></p>
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</span></font><font size="2"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 10pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Tahoma"><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-no-proof: yes">____________________________________</span></font><font size="3" face="Arial"><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-no-proof: yes"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Tahoma"><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-no-proof: yes">Paul Luse<br>
Sr. Staff Engineer<br>
PCG Server Software Engineering <br>
Desk: 480.554.3688, Mobile: 480.334.4630</span></font><font size="3" face="Arial"><span style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-no-proof: yes"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="FONT-SIZE: 11pt; mso-bidi-font-family: Calibri"><o:p> </o:p></span></font></p>
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