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From: Andi Kleen <ak@suse.de>
To: Jens Axboe <axboe@suse.de>
Cc: David Chinner <dgc@sgi.com>, Neil Brown <neilb@suse.de>,
	linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: RFC - how to balance Dirty+Writeback in the face of slow  writeback.
Date: 18 Aug 2006 20:57:31 +0200	[thread overview]
Message-ID: <p73hd0998is.fsf@verdi.suse.de> (raw)
In-Reply-To: <20060818070314.GE798@suse.de>

Jens Axboe <axboe@suse.de> writes:

> On Thu, Aug 17 2006, Andrew Morton wrote:
> > It seems that the many-writers-to-different-disks workloads don't happen
> > very often.  We know this because
> > 
> > a) The 2.4 performance is utterly awful, and I never saw anybody
> >    complain and
> 
> Talk to some of the people that used DVD-RAM devices (or other
> excruciatingly slow writers) on their system, and they would disagree
> violently :-)

I hit this recently while doing backups to a slow external USB disk.
The system was quite unusable (some commands blocked for over a minute)

-Andi

  parent reply	other threads:[~2006-08-18 18:57 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-14 23:40 RFC - how to balance Dirty+Writeback in the face of slow writeback Neil Brown
2006-08-15  8:06 ` Andrew Morton
2006-08-15 23:00   ` David Chinner
2006-08-17  4:08     ` Neil Brown
2006-08-17  6:14       ` Andrew Morton
2006-08-17 12:36         ` Trond Myklebust
2006-08-17 15:14           ` Andrew Morton
2006-08-17 16:22             ` Trond Myklebust
2006-08-18  5:49               ` Andrew Morton
2006-08-18 10:43                 ` Nikita Danilov
2006-08-18  0:11         ` David Chinner
2006-08-18  6:29           ` Andrew Morton
2006-08-18  7:03             ` Jens Axboe
2006-08-18  7:11               ` Andrew Morton
2006-08-18 18:57               ` Andi Kleen [this message]
2006-08-21  0:35                 ` Neil Brown
2006-08-21  3:15                   ` David Chinner
2006-08-21  7:24                     ` Neil Brown
2006-08-21 13:51                       ` Jens Axboe
2006-08-25  4:36                         ` Neil Brown
2006-08-25  6:37                           ` Jens Axboe
2006-08-28  1:28                             ` David Chinner
2006-08-25 13:16                           ` Trond Myklebust
2006-08-27  8:21                             ` Neil Brown
2006-08-21 14:28                       ` David Chinner
2006-08-25  5:24                         ` Neil Brown
2006-08-28  1:55                           ` David Chinner
2006-08-21  7:47                     ` Andi Kleen
2006-08-18  7:07             ` Neil Brown
2006-08-17 22:17       ` David Chinner
2006-08-17  3:59   ` Neil Brown
2006-08-17  6:22     ` Andrew Morton
2006-08-17  8:36       ` Jens Axboe
2006-08-17 13:21     ` Trond Myklebust
2006-08-17 15:30       ` Andrew Morton
2006-08-17 16:18         ` Trond Myklebust
2006-08-18  5:34           ` Andrew Morton

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