FreeBSD and poor ata performance

[fandino]

> Kenneth Culver wrote:
> 
>>> but then why does read/write tests over raw devices performs so bad?
>>> AFAIK on raw devices not filesystem, journaling, caches, etc are 
>>> involved.
>>> _______________________________________________
>>
>>
>>
>> Like I said before, you might not have been testing the throughput of 
>> the disks,
>> instead you may have been testing the throughput of /dev/zero.
> 
> 
> I woluld like to have the throughput of /dev/zero on my disks. :-)
> 
> 
> # dd if=/dev/zero of=/dev/null bs=1024k count=1024
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes transferred in 3.414659 secs (314450672 bytes/sec)

I'm redirecting this thread to current@ because something seems
broken.

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 raid split the throughput by half.

http://lists.freebsd.org/pipermail/freebsd-current/2004-October/040567.html