Re: 2.5.52, load and process in D state

From: Paolo Ciarrocchi (ciarrocchi@linuxmail.org)
Date: Sat Dec 21 2002 - 20:09:59 EST

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Maybe in reply to: Paolo Ciarrocchi: "2.5.52, load and process in D state"
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From: Andrew Morton <akpm@digeo.com>
> Paolo Ciarrocchi wrote:
> >
> > Hi all,
> > I booted 2.5.52 with the following parmater:
> > apm=off mem=32M (not sure about the amount, anyway I can reproduce
> > the problem for sure with 32M and 40M)
> >
> > Then I tried the osdb (www.osdb.org) benchmark with
> > 40M of data.
> >
> > $./bin/osdb-pg --nomulti
> >
> > the result is that aftwer a few second running top I see the postmaster
> > process in D state and a lot if iowait.
>
> What exactly _is_ the issue? The machine is achieving 25% CPU utilisation
> in user code, 6-9% in system code. It is doing a lot of I/O, and is
> getting work done.

The issue it that with 2.4.19 the postmaster process never go in D state
and iowait always reports 0%.
Sounds strange with me.

Ciao,
Paolo

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