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SubjectRe: 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

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