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DragonFly users List (threaded) for 2006-07
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Re: disk diagnostics

From: "Pieter Dumon" <pieter.dumon@xxxxxxxxx>
Date: Thu, 27 Jul 2006 15:41:14 +0200

Could this be an interrupt problem?  I'd be interested
to see the output from "vmstat -i" before and after such
an rm or tar command or similar.  Also, some lines from
"iostat 5" during the rm/tar might be useful.

I'll post that tomorrow or so

On 7/27/06, Joerg Sonnenberger <joerg@xxxxxxxxxxxxxxxxx> wrote:
That's exactly what I expected. It needs almost no processing in
userland, a little bit more in the kernel to push the IO through the
various layer and most time waiting for the ATA controller.

Ok, but is the cause of this extremely long waiting time a hardware malfunction/misconfiguration ?

When you repeat the same process with softdep, it should be a lot faster, since
it can write out many requests ordered. It would be even faster with a
proper disk scheduler, but that's (still) a dream.

I'll try, but it will be with the latest preview (1.7), not with the 1.5.4 as I updated my kernel sources.

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