linux-kernel - Re: Linux disk performance.

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Message-ID: <652016d30612200317i6d33d097xe55971750e83cd97@mail.gmail.com>
Date:	Wed, 20 Dec 2006 17:02:38 +0545
From:	"Manish Regmi" <regmi.manish@...il.com>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	kernelnewbies@...linux.org, linux-kernel@...r.kernel.org
Subject: Re: Linux disk performance.

On 12/19/06, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> When you submit a request to an empty block device queue, it can
> get "plugged" for a number of timer ticks before any IO is actually
> started. This is done for efficiency reasons and is independent of
> the IO scheduler used.
>

Thanks for the information..

> Use the noop IO scheduler, as well as the attached patch, and let's
> see what your numbers look like.
>

Unfortunately i got the same results even after applying your patch. I
also tried putting
q->unplug_delay = 1;
But it did not work. The result was similar.

-- 
---------------------------------------------------------------
regards
Manish Regmi

---------------------------------------------------------------
UNIX without a C Compiler is like eating Spaghetti with your mouth
sewn shut. It just doesn't make sense.
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