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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">Took a week for this to make it out to the list…. odd.<span style="mso-spacerun:yes">
</span>We talked about this already and I’m still investigating (time has not permitted) the scenario where it appears we’re getting paged pool memory – have confirmed w/Msft contact that we shouldn’t be<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"">
nvmewin-bounces@lists.openfabrics.org [mailto:nvmewin-bounces@lists.openfabrics.org]
<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> nvmewin@lists.openfabrics.org<br>
<b><span style="font-weight:bold">Subject:</span></b> [nvmewin] 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" 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" style="text-autospace:none"><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" style="text-autospace:none"><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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