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<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri;color:#1F497D">Hi Alex,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri;color:#1F497D">I’m aware of what the docs say but I have a BSOD (with verifier on) that claims that an address in the range of our
large chunk of queue memory is paged memory.<span style="mso-spacerun:yes"> </span>
Its accessed when we look for pending commands when being shutdown via the <span class="SpellE">
adapterControl</span> entry which runs at DIRQL.<span style="mso-spacerun:yes"> </span>
With verifier on, <span class="SpellE">its</span> supposed to throw regardless of whether the memory is actually paged out or not but simply based on whether its capable of being paged out.<span style="mso-spacerun:yes">
</span>I have a request from Msft to send them the DMP which I plan on doing this week.<span style="mso-spacerun:yes">
</span>Will keep you all posted.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri;color:#1F497D">Thx<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri;color:#1F497D">Paul<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"">
Chang, Alex [mailto:Alex.Chang@idt.com] <br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, July 24, 2012 3:39 PM<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: IO queue memory<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="blue" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">Hi Paul,</span></font><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="blue" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">Have you confirm that the IO queue memory the driver allocates can be paged out? You brought the issue up last week and
nobody could confirm that. According to the link below, StorPortAllocateContiguousMemorySpecifyCacheNode allocates a range of physically contiguous, noncached, nonpaged memory.
</span></font><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="blue" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><a href="http://msdn.microsoft.com/en-us/library/ff567027(v=vs.85)"><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">http://msdn.microsoft.com/en-us/library/ff567027(v=vs.85)</span></font></a></span></font><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="blue" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">Thanks,</span></font><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="blue" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">Alex</span></font><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;mso-outline-level:1"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<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> Wednesday, July 18, 2012 5:44 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] IO queue memory</span></font><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri">Discussion point I wanted to get some input on:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri">Memory type:<span style="mso-spacerun:yes">
</span>When we designed this, we chose cached memory for our IO queues because we don’t have to worry about DMA coherency with IA anymore however the implication here is that our queues can now be paged out which I don’t think we want for performance reasons.<span style="mso-spacerun:yes">
</span>Also, if we don’t decide to switch to non-paged for that reason we need to rework (minor) our shutdown code which is touching IO queue memory at DIRQL which, of course, you can’t do.<span style="mso-spacerun:yes">
</span>I think for the paging reason alone we should consider non cached allocations for the IO queues.<span style="mso-spacerun:yes">
</span>Other thoughts?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri">We may want to also think about a different strategy for IO queue sizing as well, if we switch to non cached, to be a little more accurate/conservative
with how much memory we’re using based on the current config.<span style="mso-spacerun:yes">
</span>Right now, for example, on a 32 core system we’ll use 2MB of memory just for IO queues.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri">Thx<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:10.0pt;mso-bidi-font-family:Calibri">Paul<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";mso-no-proof:yes">____________________________________</span></font><font size="3" face="Arial"><span style="font-size:12.0pt;font-family:"Arial","sans-serif";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-size:10.0pt;font-family:"Tahoma","sans-serif";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-size:12.0pt;font-family:"Arial","sans-serif";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:11.0pt;mso-bidi-font-family:Calibri"><o:p> </o:p></span></font></p>
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