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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>NO, I talk about performance at the host.<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> users-bounces@openvz.org
[mailto:users-bounces@openvz.org] <b>On Behalf Of </b>Roberto Mello<br>
<b>Sent:</b> Dienstag, 24. August 2010 14:48<br>
<b>To:</b> users@openvz.org<br>
<b>Subject:</b> Re: [Users] slow fsync rate<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>On Tue, Aug 24, 2010 at 4:36 AM, Dietmar Maurer <<a
href="mailto:dietmar@proxmox.com" target="_blank">dietmar@proxmox.com</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Hi all,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>we observe very slow fsync rates on newer 2.6.32 kernel with OpenVZ:</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>It is possible to reproduce the problem with sysbench:</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Requests/sec executed is considerable slower on OpenVZ kernel
(factor 20 on Intel Modular Server).</span><o:p></o:p></p>
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<p class=MsoNormal> <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<o:p></o:p></p>
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