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Date: Wed, 11 Jan 2006 11:43:03 -0800
From: Andrew Morton <akpm@osdl.org>
To: cmm@us.ibm.com
Cc: hch@lst.de, pbadari@us.ibm.com, sct@redhat.com,
       linux-kernel@vger.kernel.org, ext2-devel@lists.sourceforge.net
Subject: Re: [PATCH 0/5] multiple block allocation to current ext3
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Mingming Cao <cmm@us.ibm.com> wrote:
>
> # time ./filetst  -b 1048576 -w -f /mnt/a
>  	2.6.14		2.6.15
>  real    0m21.710s	0m25.773s
>  user    0m0.012s	0m0.004s
>  sys     0m14.569s	0m15.065s

That's a big drop.

Was it doing I/O, or was it all from pagecache?

>  I also found tiobench(sequential write test) and dbench has similar
>  regression between 2.6.14 and 2.6.15. Actually I found 2.6.15 rc2
>  already has the regression.  Is this a known issue?

No, it is not known.

> Anyway I will continue looking at the issue...

Thanks.