linux-kernel - Re: Some NCQ numbers...

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 4 Jul 2007 06:22:48 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Michael Tokarev <mjt@....msk.ru>
cc:	Tejun Heo <htejun@...il.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: Some NCQ numbers...

On Wed, 4 Jul 2007, Michael Tokarev wrote:

> Tejun Heo wrote:
>> Hello,
>>
>> Michael Tokarev wrote:
>>> Well.  It looks like the results does not depend on the
>>> elevator.  Originally I tried with deadline, and just
>>> re-ran the test with noop (hence the long delay with
>>> the answer) - changing linux elevator changes almost
>>> nothing in the results - modulo some random "fluctuations".
>>
>> I see.  Thanks for testing.
>
> Here are actual results - the tests were still running when
> I replied yesterday.
>
> Again, this is Seagate ST3250620AS "desktop" drive, 7200RPM,
> 16Mb cache, 250Gb capacity.  The tests were performed with
> queue depth = 64 (on mptsas), drive write cache is turned
> off.

I found AS scheduler to be the premium and best for single-user performance.

You want speed? Use AS.

http://home.comcast.net/~jpiszcz/sched/cfq_vs_as_vs_deadline_vs_noop.html

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/