On Tue, Aug 24, 2010 at 4:36 AM, Dietmar Maurer <span dir="ltr"><<a href="mailto:dietmar@proxmox.com" target="_blank">dietmar@proxmox.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p class="MsoNormal"><span lang="EN-US">Hi all,</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">we observe very slow fsync rates on newer
2.6.32 kernel with OpenVZ:</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span lang="EN-US">It is possible to reproduce the problem
with sysbench:</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"># sysbench --test=fileio --file-num=1
--file-total-size=50G --file-fsync-all=on --file-test-mode=seqrewr
--max-time=100 --file-block-size=4096 --max-requests=0 run</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Requests/sec executed is considerable
slower on OpenVZ kernel (factor 20 on Intel Modular Server).</span><br></p></div></div></blockquote><div> <br> Are you running the tests in a VE? I'd be curious to see your vz.conf
file, and the output of /proc/user_beancounters for the VE you are
running the tests on. Do you have quotas turned on?<br><br>Roberto<br></div></div>