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From: "Eric D. Mudama" <edmudama@gmail.com>
To: Bart Van Assche <bart.vanassche@gmail.com>
Cc: Raz Ben-Yehuda <razb@bitband.com>,
	Matthew Wilcox <matthew@wil.cx>,
	linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: Intel X25-M MLC SSD benchmarks
Date: Fri, 12 Dec 2008 07:25:18 -0700	[thread overview]
Message-ID: <311601c90812120625o4e000646u98aebc8ab3556a33@mail.gmail.com> (raw)
In-Reply-To: <e2e108260812112315q5ed1d265q86cf22b1dd59c69d@mail.gmail.com>

On Fri, Dec 12, 2008 at 12:15 AM, Bart Van Assche
<bart.vanassche@gmail.com> wrote:
>
> On Fri, Dec 12, 2008 at 5:55 AM, Eric D. Mudama <edmudama@gmail.com> 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?
>
> IMHO repeating the measurements without oflag=direct does not make
> sense: measurements with oflag=direct tell something about the
> performance of the SSD and the software layers on top of it. Without
> oflag=direct writes are buffered by Linux and data is written
> asynchronously to the SSD.

Oops, I guess I assumed that by writing a few gigabytes of data it
wouldn't matter that much.  I'll run the test again in a bit once I'm
off this solaris machine.

  reply	other threads:[~2008-12-12 14:25 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 [this message]
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
2008-12-12 12:21         ` Raz Ben-Yehuda
2008-12-12 18:10   ` Greg Freemyer

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