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<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff
size=2>Hi</FONT></SPAN></DIV>
<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff size=2>From
my testing (and also MS comments to my question) i</FONT></SPAN><SPAN
class=118185706-19042007><FONT face=Arial color=#0000ff size=2>t looks like the
SCSI driver limit the block size to maximum of 32K.</FONT></SPAN></DIV>
<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff size=2>I was
testing IOmeter with different msg size ,but I notice that the SCSI driver
split the msg to 32K chunks</FONT></SPAN></DIV>
<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff size=2>No
matter what I was set in the hba parameters I was getting blocks of 32k
.</FONT></SPAN></DIV>
<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff size=2>I
think MS is working on Virtual SCSI driver and they claim that it will support
larger IO blocks.</FONT></SPAN></DIV>
<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=118185706-19042007><FONT face=Arial color=#0000ff size=2>Yossi
</FONT></SPAN></DIV><BR>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma 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 18, 2007 8:16 PM<BR><B>To:</B>
Michael Di Domenico; ofw@lists.openfabrics.org<BR><B>Subject:</B> RE: [ofw]
windows srp<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">There
are no runtime tunables. The driver should be able to send larger I/O
requests assuming changes were made to allocate room for the buffer descriptor
tables. I don’t know what changes would be required off the top of my
head, though.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">-Fab<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
ofw-bounces@lists.openfabrics.org [mailto:ofw-bounces@lists.openfabrics.org]
<B>On Behalf Of </B>Michael Di Domenico<BR><B>Sent:</B> Wednesday, April 18,
2007 10:05 AM<BR><B>To:</B> Fab Tillier;
ofw@lists.openfabrics.org<BR><B>Subject:</B> RE: [ofw] windows
srp<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'">Fab,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'">Are
there no runtime tunables like there are for linux? Are the drivers
capable of sending large block IO’s, like on the order of 512k or 1024k bytes
per?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center>
<HR align=center width="100%" SIZE=2>
</DIV>
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> Fab Tillier
[mailto:ftillier@windows.microsoft.com] <BR><B>Sent:</B> Wednesday, April 18,
2007 12:55 PM<BR><B>To:</B> Michael Di Domenico;
ofw@lists.openfabrics.org<BR><B>Subject:</B> RE: [ofw] windows
srp</SPAN><o:p></o:p></P></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">The
SRP driver uses the maximum of number of SGEs that can fit into an ItoT IU
size or 17. This in at least 64K I/O size maximum. The driver
could be modified to increase the minimum size from 17 to some higher number –
I think it’s just a compile-time constant in one of the
headers.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">-Fab<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
ofw-bounces@lists.openfabrics.org [mailto:ofw-bounces@lists.openfabrics.org]
<B>On Behalf Of </B>Michael Di Domenico<BR><B>Sent:</B> Wednesday, April 18,
2007 7:29 AM<BR><B>To:</B> ofw@lists.openfabrics.org<BR><B>Subject:</B> [ofw]
windows srp<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Is it possible to
change the default block IO sizes for SRP sending data to native infiniband
storage devices running under windows?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">The application is
requesting large block IO, but SRP seems to be chunking the data down to
smaller blocks.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Thanks<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">-
Michael<o:p></o:p></SPAN></P></DIV></BLOCKQUOTE></BODY></HTML>