On Fri, Oct 15, 2004 at 02:50:27PM +0200, Karl Janmar wrote:
> >
> > You can also try the attached program:
> > ./tst /dev/rwd0d 30000
> > (increase the second parameter if it completes in less than 2 seconds)
> > This will benchmark the bandwith available between the drive's cache and
> > the host (as opposed to the overall drive performances).
> >
> 
> This is with the SATA disk:
> # ./tst /dev/rwd1d 3000
> 9673491 us, 19.382868 MB/s
> 
> This is on the ATA disk:
> # ./tst /dev/rwd0d 3000
> 53188011 us, 3.525231 MB/s

these are really poor performances, something is wrong.
From a seagate 8G drive (ST38410A) connected to a i810 controller:
rochebonne# /tmp/tst /dev/rwd0d 3000
4577374 us, 40.962351 MB/s

> 
> these results are a little bit strange(for me as I am not an expert),
> because  I get this when using dd, /mnt is on wd0e (the ATA disk):
> # dd if=/dev/zero of=/mnt/apslask bs=4096 count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes transferred in 17.693 secs (23150398 bytes/sec)
> 
> This doesn't ofcourse exacly test the same thing but....

This is a 400MB file, if I got it right. Could it fit entirely in RAM ?

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--