Re: 2.4.10-ac10-preempt lmbench output.

From: Andrea Arcangeli (
Date: Tue Oct 09 2001 - 23:48:33 EST

On Wed, Oct 10, 2001 at 06:42:37AM +0200, Dieter Nützel wrote:
> Am Mittwoch, 10. Oktober 2001 06:23 schrieb Andrea Arcangeli:
> > On Wed, Oct 10, 2001 at 05:57:46AM +0200, Dieter Nützel wrote:
> [...]
> > > I get the dropouts (2~3 sec) after dbench 32 is running for 9~10 seconds.
> It is mostly only _ONE_ dropout like above.

One isn't really too bad actually, if there's an huge I/O going on at

> The above plus nice -20 mpg123 *.mp3
> I've forgotten to clearify this, sorry.
> Should I try 2.4.11 + 00_vm-1 or 2.4.11aa1, again?

2.4.11aa1 with also read/write reschedule points would be more
interesting I think.

> > You're probably more interested in the possible heuristic that I've in
> > mind to avoid xmms to wait I/O completion for the work submitted by
> > dbench. Of course assuming the vm write throttling was a relevant cause
> > of the dropouts, and that the dropouts weren't just due an I/O
> > congestion (too low disk bendwith).
> > BTW, to find out if the reason of the dropouts where the vm write
> > throttling or the too low disk bandwith you can run ps l <pid_of_xmms>,
> What do you mean here? I can't find a meaningfully ps option.

I meant the output of `ps l` (WCHAN column xmms row).

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