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From: Al Boldi <a1426z@gawab.com>
To: Willy Tarreau <willy@w.ods.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Eradic disk access during reads
Date: Sun, 18 Sep 2005 09:54:32 +0300	[thread overview]
Message-ID: <200509180951.50259.a1426z@gawab.com> (raw)
In-Reply-To: <20050918052301.GA20422@alpha.home.local>

Willy Tarreau wrote:
> On Sun, Sep 18, 2005 at 07:16:46AM +0300, Al Boldi wrote:
> >
> > New synonym: eradic=erratic :)
> >
> > The problem seems to be a multi-access collision in the queue, which
> > forces a ~50% reduction of thruput, which recovers with another
> > multi-access collision.  Maybe?!
>
> do you have anything else connected to the same controller ? 

Nothing, but hda.

This problem only shows in 2.6.13, 2.4.31 works ok!

Maybe this is also accociated to the block-dev read-ahead problem?

Thanks!

--
Al



  reply	other threads:[~2005-09-18  6:56 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-17  4:26 Al Boldi
2005-09-17  5:50 ` Willy Tarreau
2005-09-17 10:32   ` Al Boldi
2005-09-17 10:44     ` Denis Vlasenko
2005-09-17 16:38       ` Al Boldi
2005-09-18 11:00         ` Denis Vlasenko
2005-09-18 13:40           ` Al Boldi
2005-09-18 16:02             ` Denis Vlasenko
2005-09-18 16:34               ` Willy Tarreau
2005-09-18 18:08                 ` Al Boldi
2005-09-17 18:46     ` Willy Tarreau
2005-09-18  4:16       ` Al Boldi
2005-09-18  5:23         ` Willy Tarreau
2005-09-18  6:54           ` Al Boldi [this message]
2005-09-18 10:40       ` Denis Vlasenko

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