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From: Dave Chinner <david@fromorbit.com>
To: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: xfs@oss.sgi.com
Subject: Re: XFS hung on 2.6.33.3 kernel
Date: Sat, 7 Aug 2010 20:08:21 +1000	[thread overview]
Message-ID: <20100807100821.GC7362@dastard> (raw)
In-Reply-To: <AANLkTinhwA1greZdCnoDvd9ieYinhjv0M07sNkbVdy3_@mail.gmail.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?

> >        - allocate the file with worst case fragmentation by
> >          writing it backwards in synchronous 4k blocks before
> >          running the test
> 
> I created the file with
> 
> dd if=/dev/zero of=... bs=1M count=...
> 
> 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=/dev/zero of=testfile bs=4k count=1 seek=$i conv=notrunc,sync
> done

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2010-08-07 10:08 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-17  4:01 XFS hung on 2.6.33.3 kernel Ilia Mirkin
2010-07-18  1:20 ` Dave Chinner
2010-07-18  1:35   ` Ilia Mirkin
2010-07-18 23:50     ` Dave Chinner
2010-08-03 22:30       ` Ilia Mirkin
2010-08-04  0:47         ` Dave Chinner
2010-08-04  1:15           ` Ilia Mirkin
2010-08-04  4:27             ` Dave Chinner
2010-08-04  4:39               ` Ilia Mirkin
2010-08-04  6:53                 ` Dave Chinner
2010-08-04 15:40                   ` Ilia Mirkin
2010-08-05  5:45                     ` Dave Chinner
2010-08-05  6:25         ` Dave Chinner
2010-08-05  6:42           ` Ilia Mirkin
2010-08-07 10:08             ` Dave Chinner [this message]
2013-04-04 21:44               ` qiyansun
2010-07-18  4:57   ` Christoph Hellwig
2010-07-18  5:28     ` Ilia Mirkin
2010-07-18 20:17       ` Ilia Mirkin
2010-07-18 23:33     ` Dave Chinner

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