FreeBSD 5.3b7and poor ata performance
fandino
fandino at ng.fadesa.es
Sat Oct 16 10:46:41 PDT 2004
Hello Kevin,
Kevin Oberman wrote:
>>Tests were done win bonnie++ 1.93c and the results were Linux two
>>times faster than FreeBSD using the same hardware.
>>
>>GNU/Linux 2.4.18 with ext2: 56848 K/sec
>>FreeBSD 5.3b7 with default fs: 26347 K/sec
>>FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec
>>FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec
>
>
> Are you comparing apples with apples? I believe that Linux mounts file
> systems as async by default. To compare with FreeBSD, you should use "-o
> async" when you mount. Of course, this is less reliable.
>
> Also, make sure that disk write-cache is enabled on both or disabled on
> both.
write-cache was enable on all tests and disks were in UDMA5 mode.
In this new round of tests I add FreeBSD witch async and OpenBSD (always
using the same hardware). FreeBSD is by far, the worst throughput of all
(about 50% slower than others) :-?
GNU/Linux 2.4.18 with ext2: 56848 K/sec
FreeBSD 5.3b7 with default fs: 26347 K/sec
FreeBSD 5.3b7 with default fs(async): 26566 K/sec
FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec
FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec
FreeBSD 5.3b7 geom stripe** (four disks): 31891 K/sec
OpenBSD 3.5 UFS fs: 55277 K/sec
* Each disk of the raid had a throughput of approx. 15000 K/sec
** Each disk of the raid had a throughput of approx. 7500 K/sec
Each disk of the read split the throughput by half.
How is possible that FreeBSD performs as bad?
http://195.55.55.164/tests/bsd.txt (original FBSD test)
http://195.55.55.164/tests/obsd.txt (openbsd test)
http://195.55.55.164/tests/gstripe-4.txt (4 disks gstripe tests with async)
http://195.55.55.164/tests/fbsd2.txt (FBSD test with async)
http://195.55.55.164/tests/linux.txt (original GNU/Linux test)
http://195.55.55.164/tests/dmesg.txt
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