From: Jeff Moyer <jmoyer@redhat.com>
To: Chris Mason <chris.mason@oracle.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>,
Valdis.Kletnieks@vt.edu, josef@redhat.com,
Michael Monnerie <michael.monnerie@is.it-management.at>,
Christoph Hellwig <hch@infradead.org>,
linux-raid@vger.kernel.org, xfs@oss.sgi.com,
linux-kernel@vger.kernel.org, dm-devel@redhat.com
Subject: Re: direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs]
Date: Thu, 05 Aug 2010 14:58:37 -0400 [thread overview]
Message-ID: <x49tyn8c2ea.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <20100805113240.GA29846@think> (Chris Mason's message of "Thu, 5 Aug 2010 07:32:40 -0400")
Chris Mason <chris.mason@oracle.com> writes:
> But, I'm surprised your drive is doing 8K dio reads at 16MB/s, that
> seems a little high.
I'm not sure why you think that. We're talking about a plain old SATA
disk, right? I can get 40-50MB/s on my systems for 8KB O_DIRECT reads.
What am I missing?
Cheers,
Jeff
next prev parent reply other threads:[~2010-08-05 18:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100804073546.GA7494@comet.dominikbrodowski.net>
[not found] ` <20100804085039.GA11671@infradead.org>
[not found] ` <20100804091317.GA27779@isilmar-3.linta.de>
[not found] ` <20100804092122.GA2998@infradead.org>
[not found] ` <201008041116.09822@zmi.at>
2010-08-04 10:25 ` How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs Dominik Brodowski
2010-08-04 11:18 ` Christoph Hellwig
[not found] ` <20100804111803.GA32643@infradead.org>
2010-08-04 11:24 ` Dominik Brodowski
2010-08-04 11:53 ` Mikael Abrahamsson
2010-08-04 12:56 ` Mike Snitzer
2010-08-04 22:24 ` Neil Brown
2010-08-04 20:33 ` Valdis.Kletnieks
2010-08-05 9:31 ` direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs] Dominik Brodowski
2010-08-05 11:32 ` Chris Mason
[not found] ` <20100805113240.GA29846@think>
2010-08-05 12:36 ` Josef Bacik
2010-08-05 15:35 ` Dominik Brodowski
2010-08-05 15:39 ` Chris Mason
[not found] ` <20100805153943.GO29846@think>
2010-08-05 15:53 ` Dominik Brodowski
2010-08-05 16:35 ` Dominik Brodowski
[not found] ` <20100805163519.GA6604@comet.dominikbrodowski.net>
2010-08-05 20:47 ` Performance impact of CONFIG_DEBUG? direct-io test case Dominik Brodowski
2010-08-05 20:54 ` Performance impact of CONFIG_SCHED_MC? " Dominik Brodowski
2010-08-05 18:58 ` Jeff Moyer [this message]
2010-08-05 19:01 ` direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs] Chris Mason
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