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Re: ahcisata poor performance

On Mon, Jul 14, 2014 at 02:38:14AM +0400, Dima Veselov wrote:
> Hello!
> Can someone tell - is there a way to inspect poor hard drive performance?
> Two computers - windows and linux, SMB and NFS connected to NetBSD host.
> Writing over SMB (GE interface) freeze linux NFS client (writing few bytes
> can take 2 seconds).
> I believe thats hard drive problem because iostat show not more than 10MB/s
> even copying locally on NetBSD from one drive to another. Top show up to
> 10% interrupt.

I would try some benchmark like iozone.
A simple dd from /dev/zero can also give some information:
dd if=/dev/zero of=file bs=1m count=50000
(you have to make sure the file created doesn't fit in ram).

Also you don't say what kind of access you're doing: a single large
file write, or lots of small files ?

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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