[Users] slow fsync rate

Roberto Mello roberto.mello at gmail.com
Tue Aug 24 08:48:15 EDT 2010


On Tue, Aug 24, 2010 at 4:36 AM, Dietmar Maurer <dietmar at proxmox.com> wrote:

>  Hi all,
>
>
>
> we observe very slow fsync rates on newer 2.6.32 kernel with OpenVZ:
>
>
>
> It is possible to reproduce the problem with sysbench:
>
>
>
> # 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
>
>
>
> Requests/sec executed is considerable slower on OpenVZ kernel (factor 20 on
> Intel Modular Server).
>

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?

Roberto
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