FreeBSD 5.3b7and poor ata performance

[Kenneth Culver]

Quoting fandino <fandino at ng.fadesa.es>:

> 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?
>
>
If you're still using the GENERIC kernel, that could explain it, and judging
from other emails I've seen from you, you're still using the GENERIC kernel.

Ken