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From: "Manish Regmi" <regmi.manish@gmail.com>
To: "Nick Piggin" <nickpiggin@yahoo.com.au>
Cc: kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org
Subject: Re: Linux disk performance.
Date: Wed, 20 Dec 2006 17:02:38 +0545	[thread overview]
Message-ID: <652016d30612200317i6d33d097xe55971750e83cd97@mail.gmail.com> (raw)
In-Reply-To: <458788D7.2070107@yahoo.com.au>

On 12/19/06, Nick Piggin <nickpiggin@yahoo.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.

  parent reply	other threads:[~2006-12-20 11:17 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-18  4:07 Manish Regmi
2006-12-18  8:35 ` Arjan van de Ven
2006-12-18 12:39   ` Manish Regmi
2006-12-18 12:54     ` Nick Piggin
2006-12-18 13:07     ` Erik Mouw
2006-12-19  6:22       ` Manish Regmi
2006-12-19  6:38         ` Nick Piggin
2006-12-19 12:18           ` Arjan van de Ven
2006-12-20 11:17           ` Manish Regmi [this message]
2006-12-22  0:14             ` Bhanu Kalyan Chetlapalli
2006-12-22  5:30               ` Manish Regmi
2006-12-22  5:39                 ` Bhanu Kalyan Chetlapalli
2006-12-22  5:56                   ` Manish Regmi
2006-12-20 22:29     ` Bill Davidsen
2006-12-21  6:03       ` Manish Regmi
2006-12-21  7:15         ` Daniel Cheng
2006-12-21 13:22         ` Erik Mouw
2006-12-22  5:39           ` Manish Regmi
2006-12-27 15:50       ` Phillip Susi
2007-01-01  1:59         ` Bill Davidsen

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