From: Al Boldi <a1426z@gawab.com>
To: Holger Kiehl <Holger.Kiehl@dwd.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
linux-raid <linux-raid@vger.kernel.org>
Subject: Re: Where is the performance bottleneck?
Date: Wed, 31 Aug 2005 07:30:38 -0300 [thread overview]
Message-ID: <200508310730.38112.a1426z@gawab.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0508301909220.25574@diagnostix.dwd.de>
Holger Kiehl wrote:
> On Mon, 29 Aug 2005, Al Boldi wrote:
> > You may be hitting a 2.6 kernel bug, which has something to do with
> > readahead, ask Jens Axboe about it! (see "[git patches] IDE update"
> > thread) Sadly, 2.6.13 did not fix it either.
>
> I did read that threat, but due to my limited understanding about kernel
> code, don't see the relation to my problem.
Basically the kernel is loosing CPU cycles while accessing bockdevices.
The problem shows most when the CPU/DISK ratio is low.
Throwing more CPU cycles at the problem may seemingly remove this bottleneck.
> But I am willing to try any patches to solve the problem.
No patches yet.
> > Did you try 2.4.31?
>
> No. Will give this a try if the problem is not found.
Keep us posted!
--
Al
next prev parent reply other threads:[~2005-08-31 10:30 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-29 18:20 Where is the performance bottleneck? Holger Kiehl
2005-08-29 19:54 ` Mark Hahn
2005-08-30 19:08 ` Holger Kiehl
2005-08-30 23:05 ` Guy
2005-09-28 20:04 ` Bill Davidsen
2005-09-30 4:52 ` Guy
2005-09-30 5:19 ` dean gaudet
2005-10-06 21:15 ` Bill Davidsen
2005-08-29 20:10 ` Al Boldi
2005-08-30 19:18 ` Holger Kiehl
2005-08-31 10:30 ` Al Boldi [this message]
2005-08-29 23:09 ` Peter Chubb
[not found] ` <20050829202529.GA32214@midnight.suse.cz>
2005-08-30 20:06 ` Holger Kiehl
2005-08-31 7:11 ` Vojtech Pavlik
2005-08-31 7:26 ` Jens Axboe
2005-08-31 11:54 ` Holger Kiehl
2005-08-31 12:07 ` Jens Axboe
2005-08-31 13:55 ` Holger Kiehl
2005-08-31 14:24 ` Dr. David Alan Gilbert
2005-08-31 20:56 ` Holger Kiehl
2005-08-31 21:16 ` Dr. David Alan Gilbert
2005-08-31 16:20 ` Jens Axboe
2005-08-31 15:16 ` jmerkey
2005-08-31 16:58 ` Tom Callahan
2005-08-31 15:47 ` jmerkey
2005-08-31 17:11 ` Jens Axboe
2005-08-31 15:59 ` jmerkey
2005-08-31 17:32 ` Jens Axboe
2005-08-31 16:51 ` Holger Kiehl
2005-08-31 17:35 ` Jens Axboe
2005-08-31 19:00 ` Holger Kiehl
2005-08-31 18:06 ` Michael Tokarev
2005-08-31 18:52 ` Ming Zhang
2005-08-31 18:57 ` Ming Zhang
2005-08-31 12:24 ` Nick Piggin
2005-08-31 16:25 ` Holger Kiehl
2005-08-31 17:25 ` Nick Piggin
2005-08-31 21:57 ` Holger Kiehl
2005-09-01 9:12 ` Holger Kiehl
2005-09-02 14:28 ` Al Boldi
2005-08-31 13:38 ` Holger Kiehl
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