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<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;color:#1F497D">Hi Greg-<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;color:#1F497D">Thanks for the question, it’s a good one!<span style="mso-spacerun:yes">
</span>The reasoning was mainly because it was fairly straightforward and had one benefit over the method you mention – we could assure NUMA optimization and vector matching for both SQ and CQ.<span style="mso-spacerun:yes">
</span>There are many, many ways that one could approach this problem and we discussed<span style="mso-spacerun:yes">
</span>a few as part of the <span class="SpellE">dev</span> of this driver and then individually discussed experiences with various methods with other
<span class="SpellE">dev</span> teams at our respective companies.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;color:#1F497D">If one uses the method you mention below, we’d create our SQ/CQ per core NUMA optimized and then be submitting on a different core than we complete
on however we’d still be optimizing the completion side.<span style="mso-spacerun:yes">
</span>The more I thought about this the more I realize <span class="SpellE">its</span> actually not buying us much of anything over using the Msft API due to the effects of CPU cache and the fact that the SQ access on submission is a write and not a read.<span style="mso-spacerun:yes">
</span>I also heard from various other folks that they didn’t find the API below to be accurate all of the time, I can’t say from experience that I’ve seen this.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;color:#1F497D">That said, I will likely be proposing an alternate method in the near future so I’ll go ahead and propose it now since you brought up the subject:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;color:#1F497D">Proposal:<span style="mso-spacerun:yes">
</span>no long decompose the MSI address to populate the mapping table.<span style="mso-spacerun:yes">
</span>Instead, start off with a 1:1 mapping and ‘learn and update’ the mapping table on the completion side.<span style="mso-spacerun:yes">
</span>Would still avoid the storport API because I don’t think it adds value over the learned method and requires us to use the DPC steering option which I’ve witnessed to have unpredictable side effects.<span style="mso-spacerun:yes">
</span>I do plan on following up with Msft (and have already had several internal discussions at Intel with other storport
<span class="SpellE">devs</span>) on exactly how some of these optimizations within storport so we can better gauge whether they’re a good fit for us or now.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;color:#1F497D">Pro:<span style="mso-spacerun:yes">
</span>This will *<b><span style="font-weight:bold">always</span></b>* work whereas the method we have no does not work for APIC logical mode.<span style="mso-spacerun:yes">
</span>I prefer a simple “one size fits all” solution every time over a 2 path solution even if one path is slightly optimized.<span style="mso-spacerun:yes">
</span>It makes the driver more maintainable and gives us less variables in debug (right now we don’t even store whether we found the APIC in
<span class="SpellE">phy</span> or logical mode so during debug you don’t really know).<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;color:#1F497D">Con:<span style="mso-spacerun:yes">
</span>SQ <span class="SpellE">mem</span> will be on a different core than the submitting thread but I don’t believe this is a measurable issue.<span style="mso-spacerun:yes">
</span>Certainly can perform some experiments to check though<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;color:#1F497D">Other thoughts?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;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;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;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;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"">
nvmewin-bounces@lists.openfabrics.org [mailto:nvmewin-bounces@lists.openfabrics.org]
<b><span style="font-weight:bold">On Behalf Of </span></b>Greg de Valois<br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, February 14, 2012 5:02 PM<br>
<b><span style="font-weight:bold">To:</span></b> nvmewin@lists.openfabrics.org<br>
<b><span style="font-weight:bold">Subject:</span></b> [nvmewin] Question on Processor to MSI vector mapping<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>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:#1F497D">All:</span></font><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:black"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:#1F497D">I'm wondering if anyone can explain to me the reasoning behind the processor
to MSI vector translation that is being done by the driver, instead of using the vector returned from StorPortGetStartIoPerfParams for each IO? Are there cases where this doesn't work properly?<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:#1F497D"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:#1F497D">Thanks,
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:#1F497D"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:#1F497D">Greg de Valois<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:#1F497D">SanDisk</span></font><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></font></p>
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