From: Mike Galbraith <mikeg@wen-online.de>
To: Matti Aarnio <matti.aarnio@zmailer.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: scheduling problem test13-pre7
Date: Sun, 31 Dec 2000 12:44:22 +0100 (CET) [thread overview]
Message-ID: <Pine.Linu.4.10.10012311237420.1563-100000@mikeg.weiden.de> (raw)
In-Reply-To: <20001231132850.C28963@mea-ext.zmailer.org>
On Sun, 31 Dec 2000, Matti Aarnio wrote:
> On Sun, Dec 31, 2000 at 10:42:26AM +0100, Mike Galbraith wrote:
> > Hi,
> >
> > While running iozone, I notice severe stalls of vmstat output
> > despite vmstat running SCHED_RR and mlockall().
>
> Lets eliminate the obvious:
>
> - Are you running with IDE disk ?
Yes.
> - Does hdparm /dev/hda(whatever) report:
>
> /dev/hda:
> unmaskirq = 0 (off)
> using_dma = 0 (off)
No.
/dev/hda:
multcount = 0 (off)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 1 (on)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 2482/255/63, sectors = 39876480, start = 0
>
> The IKD uses local interrupts, so this isn't necessarily true...
I just did a (mondo) trace covering 8 seconds of kernel time, and
vmstat ran twice. (Those two times were before I noticed the stall
and started counting down toward 'poke the freeze-frame button')
-Mike
-
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prev parent reply other threads:[~2000-12-31 12:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-31 9:42 Mike Galbraith
2000-12-31 11:28 ` Matti Aarnio
2000-12-31 11:44 ` Mike Galbraith [this message]
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