On Wed, Aug 25, 2010 at 8:54 AM, Dietmar Maurer <diet...@proxmox.com> wrote:
> Hi Kir,
>
> > These numbers very much resemble fsync() rate with write cache enabled
> > (~1000/sec) and disabled (50-70/sec).
> > check write cache settings with hdparm + check whether you have barrier
> > mount option on ext3.
>
> I use exactly the same system. The only thing I change is the kernel.
> kernel with
> OpenVZ patches is factor 20 slower!
>
> That is why I ask if you can reproduce the problem?
>
poor performance here Dietmar, whit a SAS 10Krpm drive:
m2:~# sysbench --test=fileio --file-num=1 --file-total-size=20G
--file-fsync-all=on --file-test-mode=seqrewr --max-time=100
--file-block-size=4096 --max-requests=0 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 1
Extra file open flags: 0
1 files, 20Gb each
20Gb total file size
Block size 4Kb
Calling fsync() after each write operation.
Using synchronous I/O mode
Doing sequential rewrite test
Threads started!
Time limit exceeded, exiting...
Done.
Operations performed: 0 Read, 3323 Write, 3323 Other = 6646 Total
Read 0b Written 12.98Mb Total transferred 12.98Mb (132.88Kb/sec)
33.22 Requests/sec executed
Test execution summary:
total time: 100.0286s
total number of events: 3323
total time taken by event execution: 100.0146
per-request statistics:
min: 24.22ms
avg: 30.10ms
max: 89.84ms
approx. 95 percentile: 33.97ms
Threads fairness:
events (avg/stddev): 3323.0000/0.00
execution time (avg/stddev): 100.0146/0.00
m2:~# uname -a
Linux m2 2.6.32.15 #1 SMP Fri Jul 16 20:17:30 CEST 2010 x86_64 GNU/Linux
I think it's budarin.1 kernel.
--
Marc
_______________________________________________
Users mailing list
Users@openvz.org
https://openvz.org/mailman/listinfo/users
