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From: Jeff Garzik <jeff@garzik.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Carlo Wood <carlo@alinoe.com>,
	Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	Arjan van de Ven <arjan@infradead.org>,
	linux-kernel@vger.kernel.org
Subject: Re: SATA Harddisk speed drop of 100 MB/s
Date: Sat, 23 Jun 2007 18:21:49 -0400	[thread overview]
Message-ID: <467D9CFD.7020603@garzik.org> (raw)
In-Reply-To: <20070623102949.09e36fb9.akpm@linux-foundation.org>

Andrew Morton wrote:
> Please see http://bugzilla.kernel.org/show_bug.cgi?id=8636
> 
> In that report a pretty large slowdown with CFQ has been identified.
> Jens has plunked a patch in there (Comment #50) and then ran away on
> vacation.
> 
> If someone can test that patch and demonstrate its goodness, I'll
> queue it up, thanks.

This has unfortunately split up into two threads.  I identified the root 
cause of the slowdown as NCQ in the thread "Re: SATA RAID5 speed drop of 
100 MB/s" on LKML.

	Jeff



  reply	other threads:[~2007-06-23 22:22 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-20 22:48 SATA Harddisk speed drop of 100 MB/s Carlo Wood
2007-06-20 23:06 ` Jeff Garzik
2007-06-21  3:36   ` Arjan van de Ven
2007-06-22 16:21     ` Carlo Wood
2007-06-22 21:17       ` Henrique de Moraes Holschuh
2007-06-22 21:27         ` Carlo Wood
2007-06-23  1:31           ` Henrique de Moraes Holschuh
2007-06-23  2:59             ` Carlo Wood
2007-06-23 17:29               ` Andrew Morton
2007-06-23 22:21                 ` Jeff Garzik [this message]
2007-06-25 15:18               ` Lennart Sorensen
2007-06-25 16:04                 ` Carlo Wood
2007-06-22 21:44   ` SATA RAID5 " Carlo Wood
2007-06-23  3:54     ` Carlo Wood
2007-06-23  6:22       ` Tejun Heo
2007-06-22 21:48   ` Carlo Wood
2007-06-23  7:03     ` Jeff Garzik
2007-06-23  7:54       ` Tejun Heo
2007-06-23 12:53       ` Carlo Wood
2007-06-23 17:30         ` Bartlomiej Zolnierkiewicz
2007-06-23 22:43         ` Jeff Garzik
2007-06-24 11:58           ` Michael Tokarev
2007-06-24 12:59             ` Dr. David Alan Gilbert
2007-06-24 14:21               ` Justin Piszcz
2007-06-24 15:52                 ` Michael Tokarev
2007-06-24 16:59                   ` Justin Piszcz
2007-06-24 22:07                     ` Carlo Wood
2007-06-24 23:46                       ` Mark Lord
2007-06-25  0:23                       ` Patrick Mau
2007-06-24 15:48               ` Michael Tokarev
2007-07-05 22:12             ` Phillip Susi
2007-06-24  0:54       ` Eyal Lebedinsky
  -- strict thread matches above, loose matches on Subject: below --
2007-06-23  5:26 SATA Harddisk " Al Boldi

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