linux-kernel - Re: [PATCH] firmware: speed up request

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Message-Id: <1233167722.18091.2.camel@calx>
Date:	Wed, 28 Jan 2009 12:35:22 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Ira Snyder <iws@...o.caltech.edu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: speed up request_firmware()

On Wed, 2009-01-28 at 18:11 +0000, Alan Cox wrote:
> > Without this patch, loading a 12MB firmware image (FPGA bitfiles) called
> > vmalloc() approximately 3000 times. With the patch, vmalloc() is only
> > called 13 times, however, some memory is wasted until firmware_release() is
> > called. Usually, this happens very quickly, so it shouldn't be a problem.
> 
> Particularly on 32bit x86 vmalloc memory space is very precious so while
> the current buffer size default may be too small doubling repeatedly is
> not a good model IMHO.

How about a small exponent like 1.1?

-- 
http://selenic.com : development and support for Mercurial and Linux


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