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Date: Sat, 7 Aug 2010 20:08:21 +1000
From: Dave Chinner <david@fromorbit.com>
Subject: Re: XFS hung on 2.6.33.3 kernel
Message-ID: <20100807100821.GC7362@dastard>
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To: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: xfs@oss.sgi.com

On Thu, Aug 05, 2010 at 02:42:38AM -0400, Ilia Mirkin wrote:
> On Thu, Aug 5, 2010 at 2:25 AM, Dave Chinner <david@fromorbit.com> wrote:
> > a couple of things to see if the hang can be caused faster? Maybe
> > trying these different initial conditions:
> =

> Together or independently?

independently first - then if that does't work, maybe together?

> > =A0 =A0 =A0 =A0- allocate the file with worst case fragmentation by
> > =A0 =A0 =A0 =A0 =A0writing it backwards in synchronous 4k blocks before
> > =A0 =A0 =A0 =A0 =A0running the test
> =

> I created the file with
> =

> dd if=3D/dev/zero of=3D... bs=3D1M count=3D...
> =

> How would I "write backwards"? Like truncate and then seek to the end,
> write, seek back, write, etc? Is there a utility that might do it
> already?

For a 1GB file:

$ for i in `seq 256000 1 0`; do
> dd if=3D/dev/zero of=3Dtestfile bs=3D4k count=3D1 seek=3D$i conv=3Dnotrun=
c,sync
> done

Cheers,

Dave.
-- =

Dave Chinner
david@fromorbit.com

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