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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Applied at 2936<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Alex Naslednikov <br>
<b>Sent:</b> Sunday, May 23, 2010 10:07 AM<br>
<b>To:</b> Tzachi Dar; Uri Habusha<br>
<b>Cc:</b> ofw@lists.openfabrics.org<br>
<b>Subject:</b> [Patch][Tools] Change Peak BW calculation when the difference
between post and completion is abnormal<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The
function that used for time measuring -
QueryPerformanceCounter() - not always returns proper results.</span><o:p></o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>According
to MS (<a
href="http://msdn.microsoft.com/en-us/library/ms644904%28VS.85%29.aspx">http://msdn.microsoft.com/en-us/library/ms644904%28VS.85%29.aspx</a>)</span><o:p></o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>1.
It can return 0</span><o:p></o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>2.
By default, one does not set the affinity and thus this function' call can be
adressed to any of the CPUs and you can get different results</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>3.
As a consequence, a time difference between post and completion can be
infinitely close to 0.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>4.
It will not affect the BW but may affect Peak BW on some computers</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>signed-off
by: Alexander Naslednikov (xalex at mellanox.co.il)</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Index:
D:/windows/MLNX_VPI_trunk/tools/perftests/user/send_bw/send_bw.c<br>
===================================================================<br>
---
D:/windows/MLNX_VPI_trunk/tools/perftests/user/send_bw/send_bw.c (revision
5893)<br>
+++
D:/windows/MLNX_VPI_trunk/tools/perftests/user/send_bw/send_bw.c (revision
5894)<br>
@@ -571,13 +571,17 @@<br>
cycles_t t;<br>
<br>
<br>
+ tsize = duplex ? 2 : 1;<br>
+ tsize = tsize * size;<br>
+<br>
opt_delta = tcompleted[opt_posted] - tposted[opt_completed];<br>
-<br>
+#define MAX_AVAILABLE_BW 40000000<br>
/* Find the peak bandwidth */<br>
for (i = 0; i < (int)iters; ++i)<br>
for (j = i; j < (int)iters; ++j) {<br>
t = (tcompleted[j] - tposted[i]) / (j - i + 1);<br>
- if (t < opt_delta) {<br>
+ if (t < opt_delta && t > (tsize /
MAX_AVAILABLE_BW)) {<br>
+ // Avoid the sitatuation when opt_delta is infinitely
close to 0<br>
opt_delta = t;<br>
opt_posted = i;<br>
opt_completed = j;<br>
@@ -586,8 +590,6 @@<br>
<br>
cycles_to_units = get_cpu_mhz();<br>
<br>
- tsize = duplex ? 2 : 1;<br>
- tsize = tsize * size;<br>
printf("%7d
%d
%7.2f
%7.2f \n",<br>
size,iters,tsize *
cycles_to_units / opt_delta / 0x100000,<br>
(uint64_t)tsize * iters * cycles_to_units /(tcompleted[iters
- 1] - tposted[0]) / 0x100000);<br>
Index: D:/windows/MLNX_VPI_trunk/tools/perftests/user/write_bw/write_bw.c<br>
===================================================================<br>
--- D:/windows/MLNX_VPI_trunk/tools/perftests/user/write_bw/write_bw.c (revision
5893)<br>
+++
D:/windows/MLNX_VPI_trunk/tools/perftests/user/write_bw/write_bw.c (revision
5894)<br>
@@ -501,13 +501,17 @@<br>
cycles_t t;<br>
<br>
<br>
+ tsize = duplex ? 2 : 1;<br>
+ tsize = tsize * size;<br>
+<br>
opt_delta = tcompleted[opt_posted] - tposted[opt_completed];<br>
-<br>
+#define MAX_AVAILABLE_BW 40000000<br>
/* Find the peak bandwidth */<br>
for (i = 0; i < iters * user_param->numofqps; ++i)<br>
for (j = i; j < iters * user_param->numofqps; ++j) {<br>
t = (tcompleted[j] - tposted[i]) / (j - i + 1);<br>
- if (t < opt_delta) {<br>
+ if (t < opt_delta && t > (tsize /
MAX_AVAILABLE_BW)) {<br>
+ // Avoid the sitatuation when opt_delta is infinitely
close to 0<br>
opt_delta = t;<br>
opt_posted = i;<br>
opt_completed = j;<br>
@@ -517,8 +521,6 @@<br>
<br>
cycles_to_units = get_cpu_mhz();<br>
<br>
- tsize = duplex ? 2 : 1;<br>
- tsize = tsize * size;<br>
printf("%7d
%d
%7.2f
%7.2f\n",<br>
size,iters,tsize * cycles_to_units / opt_delta / 0x100000,<br>
(uint64_t)tsize * iters * user_param->numofqps * cycles_to_units
/(tcompleted[(iters* user_param->numofqps) - 1] - tposted[0]) / 0x100000);<br>
Index: D:/windows/MLNX_VPI_trunk/tools/perftests/user/read_bw/read_bw.c<br>
===================================================================<br>
--- D:/windows/MLNX_VPI_trunk/tools/perftests/user/read_bw/read_bw.c (revision
5893)<br>
+++
D:/windows/MLNX_VPI_trunk/tools/perftests/user/read_bw/read_bw.c (revision
5894)<br>
@@ -467,13 +467,17 @@<br>
cycles_t t;<br>
<br>
<br>
+ tsize = duplex ? 2 : 1;<br>
+ tsize = tsize * size;<br>
+<br>
opt_delta = tcompleted[opt_posted] - tposted[opt_completed];<br>
-<br>
+#define MAX_AVAILABLE_BW 40000000<br>
/* Find the peak bandwidth */<br>
for (i = 0; i < iters; ++i)<br>
for (j = i; j < iters; ++j) {<br>
t = (tcompleted[j] - tposted[i]) / (j - i + 1);<br>
- if (t < opt_delta) {<br>
+ if (t < opt_delta && t > (tsize /
MAX_AVAILABLE_BW)) {<br>
+ // Avoid the sitatuation when opt_delta is infinitely
close to 0<br>
opt_delta = t;<br>
opt_posted = i;<br>
opt_completed = j;<br>
@@ -482,8 +486,6 @@<br>
<br>
cycles_to_units = get_cpu_mhz() ;<br>
<br>
- tsize = duplex ? 2 : 1;<br>
- tsize = tsize * size;<br>
printf("%7d
%d
%7.2f
%7.2f\n",<br>
size,iters,tsize *
cycles_to_units / opt_delta / 0x100000,<br>
(uint64_t)tsize * iters *
cycles_to_units /(tcompleted[iters - 1] - tposted[0]) / 0x100000);<o:p></o:p></span></p>
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