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<DIV><SPAN class=847172119-30042007><FONT face=Arial color=#0000ff size=2>Please
see below</FONT></SPAN></DIV>
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</FONT><FONT face=Arial><FONT size=2><B>From:</B>
ofw-bounces@lists.openfabrics.org [mailto:ofw-bounces@lists.openfabrics.org]
<B>On Behalf Of </B>Fab Tillier<BR><B>Sent:</B> Wednesday, April 11, 2007 10:14
PM<BR><B>To:</B> ofw@lists.openfabrics.org<BR><B>Cc:</B> Jeff Baxter; Xavier
Pillons<BR><B>Subject:</B> [ofw] MTHCA registry
parameters<BR><BR></FONT></FONT></DIV>
<DIV dir=ltr></DIV>
<DIV class=MsoNormal dir=ltr><FONT face=Arial><FONT size=2>Hi
folks,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office"
/><o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoNormal dir=ltr><o:p><FONT face=Arial
size=2> </FONT></o:p></DIV>
<DIV class=MsoNormal dir=ltr><FONT face=Arial><FONT size=2>What do the following
registry parameters for MTHCA do?<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoNormal dir=ltr><o:p><FONT face=Arial
size=2> </FONT></o:p></DIV>
<DIV class=MsoNormal dir=ltr><FONT face=Arial><FONT
size=2>HKR,"Parameters","TunePci",%REG_DWORD%,0<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>What does PCI tuning do?<BR><SPAN class=847172119-30042007><FONT
color=#0000ff>[Erez Cohen] It has different actions for PCIX and PCIe
based HCAs</FONT></SPAN></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT><FONT face=Arial
color=#0000ff size=2><SPAN class=847172119-30042007><SPAN
class=192062819-30042007>
</SPAN></SPAN></FONT></FONT><SPAN class=847172119-30042007><FONT
color=#0000ff><FONT face=Arial size=2>PCIX: Change default value of "max receive
byte count" in PCI configuration header</FONT></FONT></SPAN></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><SPAN
class=847172119-30042007></SPAN><SPAN class=847172119-30042007><FONT
face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=192062819-30042007>
</SPAN>PCIe: Change default value of "max read request size" in PCI
configuration header</FONT></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial
color=#000000 size=2> </FONT></SPAN><o:p></o:p></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>Why is it off by default?<BR><SPAN class=847172119-30042007><FONT
color=#0000ff>[Erez Cohen] We seen the need for this configuration only on
some systems (chipsets) </FONT></SPAN><o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>Does turning it on result in higher bandwidth or lower
latency?<BR><SPAN class=847172119-30042007><FONT color=#0000ff>[Erez
Cohen] BW only </FONT></SPAN><o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>What are the risks in turning it on?<BR><SPAN
class=847172119-30042007><FONT color=#0000ff>[Erez Cohen] reduce BW in some
systems. </FONT></SPAN><o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoNormal dir=ltr><o:p><FONT face=Arial
size=2> </FONT></o:p></DIV>
<DIV class=MsoNormal dir=ltr><FONT face=Arial><FONT
size=2>HKR,"Parameters","ProcessorAffinity",%REG_DWORD%,0<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>Is this ISR or DPC affinity, or
both?<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>Does this apply to kernel mode
only?<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoNormal dir=ltr><o:p><FONT face=Arial
size=2> </FONT></o:p></DIV>
<DIV class=MsoNormal dir=ltr><FONT face=Arial><FONT
size=2>HKR,"Parameters","MaxDpcTimeUs",%REG_DWORD%,10000<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>What does this do?<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>How does it affect performance when the value is increased or
lowered?<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoListParagraph dir=ltr
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><FONT face=Arial><FONT
size=2><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>Is this default value tuned for performance or system
responsiveness?<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoNormal dir=ltr><o:p><FONT face=Arial
size=2> </FONT></o:p></DIV>
<DIV class=MsoNormal dir=ltr><FONT face=Arial><FONT
size=2>Thanks!<o:p></o:p></FONT></FONT></DIV>
<DIV class=MsoNormal dir=ltr><FONT face=Arial><FONT
size=2>-Fab<o:p></o:p></FONT></FONT></DIV></BODY></HTML>