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Re: [PATCH] File readahead buffering

From: Bean
Subject: Re: [PATCH] File readahead buffering
Date: Wed, 23 Jul 2008 10:05:36 +0800

On Wed, Jul 23, 2008 at 3:06 AM, Colin D Bennett <address@hidden> wrote:
> On Tue, 22 Jul 2008 14:48:31 -0400
> Pavel Roskin <address@hidden> wrote:
>> On Tue, 2008-07-22 at 08:43 -0700, Colin D Bennett wrote:
>> > This patch speeds up loading a TGA image on my test system from 29
>> > seconds to approximately 1 second.
>> >
>> > I noticed that on my 1 GHz test system running from an IDE
>> > CompactFlash drive, loading a certain TGA image in GRUB takes about
>> > 29 seconds.
>> I'm sorry for straying from your point, but maybe we should drop TGA
>> support.  It was the first image format for GRUB to support, but now
>> PNG is supported, and it should be better in all aspects.
> I agree that TGA is not, in general, a great choice for an image format
> (unless it is faster to load a large background image -- a 1024x768 RGB
> PNG file may take more time to decompress than a TGA image would take
> to load -- although perhaps an uncompressed PNG file would be
> comparable in speed to load).  However, I have not been able to load any
> PNG images that I have tried to use. Something about the chunk type not
> being supported.


Please upload the png file that cause problem.

Also note that png use DEFLATE compression. I write a decoder in png,
which may be a little slow. Perhaps I can import the decoder from
zlib, if copyright allows.


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