Re: [Users] slow fsync rate

[Roberto Mello]

On Tue, Aug 24, 2010 at 4:36 AM, Dietmar Maurer diet...@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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RE: [Users] slow fsync rate

[Dietmar Maurer]

NO, I talk about performance at the host.


From: users-boun...@openvz.org [mailto:users-boun...@openvz.org] On Behalf Of 
Roberto Mello
Sent: Dienstag, 24. August 2010 14:48
To: users@openvz.org
Subject: Re: [Users] slow fsync rate

On Tue, Aug 24, 2010 at 4:36 AM, Dietmar Maurer 
diet...@proxmox.commailto:diet...@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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