From: "Stephen C. Tweedie" <sct@redhat.com>
To: Zlatko Calusic <zlatko.calusic@iskon.hr>
Cc: Andrew Morton <akpm@zip.com.au>,
sct@redhat.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: ext3 writeback mode slower than ordered mode?
Date: Mon, 10 Dec 2001 18:18:09 +0000 [thread overview]
Message-ID: <20011210181809.J1919@redhat.com> (raw)
In-Reply-To: <877krwch39.fsf@atlas.iskon.hr>; from zlatko.calusic@iskon.hr on Sun, Dec 09, 2001 at 08:46:02PM +0100
Hi,
On Sun, Dec 09, 2001 at 08:46:02PM +0100, Zlatko Calusic wrote:
> To sumarize:
>
> ext2 0.01s user 1.86s system 98% cpu 1.893 total
> ext3/ordered 0.07s user 3.50s system 99% cpu 3.594 total
> ext3/writeback 0.00s user 6.05s system 98% cpu 6.129 total
>
> What is strange is that not always I've been able to get different
> results for writeback case (comparing to ordered), but when I get it,
> it is repeatable.
So it could be something as basic as disk layout or allocation
pattern. Hmm.
Could you profile the kernel and see where writeback is spending all
the time, in that case?
Thanks,
Stephen
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next prev parent reply other threads:[~2001-12-10 18:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-08 21:10 Zlatko Calusic
2001-12-09 1:59 ` Andrew Morton
2001-12-09 12:58 ` Juan Piernas Canovas
2001-12-09 19:46 ` Zlatko Calusic
2001-12-10 18:18 ` Stephen C. Tweedie [this message]
2001-12-11 22:31 ` Zlatko Calusic
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