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
next prev parent reply other threads:[~2007-06-23 22:22 UTC|newest]
Thread overview: 32+ 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
-- strict thread matches above, loose matches on Subject: below --
2007-06-23 5:26 SATA Harddisk " Al Boldi
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