Date: Wed, 8 Oct 2008 15:02:24 +0200 From: Julien Drouard <jdrouard@ankama.com> To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Problem with writes on HD with FreeBSD 7 Message-ID: <7AFA66599AC41847AD8E021A1DBB9D1403E32A56D2@pandore.ankama.com>
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Hi,
Since a few weeks some of our database servers are running under FreeBSD 7 =
and we have noticed that writes on HD take a lot of time. To confirm our im=
pression we ran sysbench. The results are the following :
* Under FreeBSD 7 :
Random write :
Operations performed: 0 Read, 10000 Write, 12800 Other =3D 22800 Total
Read 0b Written 156.25Mb Total transferred 156.25Mb (1.6459Mb/sec)
105.34 Requests/sec executed
Test execution summary:
total time: 94.9312s
total number of events: 10000
total time taken by event execution: 41.1071
per-request statistics:
min: 0.0000s
avg: 0.0041s
max: 0.1653s
approx. 95 percentile: 0.0251s
* Under FreeBSD 6.2 :
random write
Operations performed: 0 Read, 10005 Write, 12673 Other =3D 22678 Total
Read 0b Written 156.33Mb Total transferred 156.33Mb (10.505Mb/sec)
672.32 Requests/sec executed
Test execution summary:
total time: 14.8814s
total number of events: 10005
total time taken by event execution: 112.2531
per-request statistics:
min: 0.0000s
avg: 0.0112s
max: 0.9868s
approx. 95 percentile: 0.0010s
The command used for sysbench is : sysbench --num-threads=3D16 --test=3Dfil=
eio --file-total-size=3D3G --file-test-mode=3Drndwr run
I have found absolutely nothing to explain that differences so if someone c=
an help me to solve this problem I would be very grateful.
Kind Regards,
Julien
--=20
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