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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next prev parent 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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