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From: Arjan van de Ven <arjan@infradead.org>
To: "Ananiev, Leonid I" <leonid.i.ananiev@intel.com>
Cc: linux-kernel@vger.kernel.org, rdunlap@xenotime.net
Subject: Re: [PATCH 1/1] indirect function calls elimination in IO scheduler
Date: Wed, 19 Oct 2005 15:56:11 +0200	[thread overview]
Message-ID: <1129730171.2822.36.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <6694B22B6436BC43B429958787E4549892AE55@mssmsx402nb>

On Wed, 2005-10-19 at 17:08 +0400, Ananiev, Leonid I wrote:
> >From Leonid Ananiev
> 
>       Fully modular io schedulers and enables online switching between
> them was introduced in Linux 2.6.10 but as a result percentage of CPU
> using by kernel was increased and performance degradation is marked on
> Itanium. A cause of degradation is in more steps for indirect IO
> scheduler type specific function calls.
>       The patch eliminates 45 indirect function calls in 16 elevator
> functions. 

does it really reduce those function calls? I thought it only reduced a
few pointers to be followed, but not the actual indirect function calls!




  reply	other threads:[~2005-10-19 13:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-10-19 13:08 Ananiev, Leonid I
2005-10-19 13:56 ` Arjan van de Ven [this message]
  -- strict thread matches above, loose matches on Subject: below --
2005-12-01 17:18 Ananiev, Leonid I
2005-10-20  5:11 Ananiev, Leonid I
2005-10-18 13:15 Ananiev, Leonid I
2005-10-17 17:01 Ananiev, Leonid I
2005-10-17 17:58 ` [PATCH " Jens Axboe
2005-10-17 19:25   ` Chen, Kenneth W
2005-10-17 19:40     ` Jens Axboe
2005-10-17 16:12 Ananiev, Leonid I
2005-10-18  2:44 ` Randy.Dunlap
2005-10-16 22:28 Ananiev, Leonid I
2005-10-17  3:41 ` [PATCH " Randy.Dunlap

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