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Re: Kernel hangs with mongo.pl benchmark.

To: Seth Mos <knuffie@xxxxxxxxx>
Subject: Re: Kernel hangs with mongo.pl benchmark.
From: Paul Schutte <paul@xxxxxxxxxxx>
Date: Sun, 02 Sep 2001 22:41:58 +0200
Cc: Eric Sandeen <sandeen@xxxxxxx>, XFS mailing list <linux-xfs@xxxxxxxxxxx>
References: <Pine.BSI.4.10.10108312347080.24274-100000@xs4.xs4all.nl>
Sender: owner-linux-xfs@xxxxxxxxxxx
Seth Mos wrote:

> On Fri, 31 Aug 2001, Eric Sandeen wrote:
>
> > Paul Schutte wrote:
> > >
> > > Hi,
> > >
> > > I found a problem while doing benchmarks with mongo.pl
> > >
> > > The sympthom is that the machine just hangs. No error messages.
> >
> > Ok, I see this too.... looks like bdflush is the only thing that's
> > running.
> >
> > If I try a sync, then that's what hangs, both of these get lost in
> > write_some_buffers - looks like a deadlock?
>
> Then it is specific to scsi perhaps. AFAIk the scsi layer was never
> considered "elegant".

I Think this is a SCSI thing.
I just ran it on a BusLogic card.
I saw the same sympthoms: only bdflush running.

Thus far I could'nt reproduce this on any IDE system.


>
> > Hm.... you think Hans did this on purpose?  ;-)
> >
> > I'll see if I can find anything next week... time for my weekend now,
> > I'm afraid.
>
> Mine started 8 hours ago :-)
>
> > Thanks for pointing this out!
> >
> > -Eric
> >
> > p.s. fwiw, this is on adaptec hardware as well.
>
> I am not seeing it on my Athlon and IDE home box. Is this thus only
> reproducable on adaptec/scsi hardware?
>
> I'll scavenge the room for my spare 4.5GB scsi disk and see if I can get
> my homebox to hang. My controller however is a sym53c8xx.
>
> I have tried 1,5 and 10 processes but it just won't hang :-)
>
> Cheers
>
> Seth

Paul


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