From: Matthew Wilcox <matthew@wil.cx>
To: "Eric D. Mudama" <edmudama@gmail.com>
Cc: Raz Ben-Yehuda <razb@bitband.com>,
linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: Intel X25-M MLC SSD benchmarks
Date: Fri, 12 Dec 2008 05:15:11 -0700 [thread overview]
Message-ID: <20081212121511.GH26095@parisc-linux.org> (raw)
In-Reply-To: <311601c90812112055i7ec955d6kf4fc13279817cdb0@mail.gmail.com>
On Thu, Dec 11, 2008 at 09:55:56PM -0700, Eric D. Mudama wrote:
> On 12/11/08, Eric D. Mudama <edmudama@gmail.com> wrote:
> > Out of curiosity, is write cache enabled or disabled on these devices?
>
> Oops, I just noticed the oflag=direct, that can have a huge
> performance difference depending on the block size.
>
> What numbers are you getting without oflag=direct?
Without the oflag=direct option, you're measuring the performance of the
Linux page cache. That's not very interesting.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2008-12-12 12:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AclbDGOLOskD7sbdTh+kIygApfPXZg==>
2008-12-10 21:15 ` Intel X25-M MLC SSD benchmarks Raz Ben-Yehuda
2008-12-10 21:39 ` Matthew Wilcox
2008-12-10 22:12 ` Raz Ben-Yehuda
2008-12-11 3:44 ` Matthew Wilcox
2008-12-12 3:27 ` Eric D. Mudama
2008-12-12 4:55 ` Eric D. Mudama
2008-12-12 7:15 ` Bart Van Assche
2008-12-12 14:25 ` Eric D. Mudama
2008-12-12 15:20 ` Matthew Wilcox
2008-12-12 15:55 ` Eric D. Mudama
2008-12-12 17:12 ` Raz Ben-Yehuda
2008-12-12 12:15 ` Matthew Wilcox [this message]
2008-12-12 12:21 ` Raz Ben-Yehuda
2008-12-12 18:10 ` Greg Freemyer
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