Re: Strange IDE performance change in 2.6.1-rc1 (again)

[Andrew Morton]

Ram Pai <linuxram@xxxxxxxxxx> wrote:
>
> 1) see whether you see a regression with files replacing the 
>     cat command in your script with
>         dd if=big_file of=/dev/null bs=1M count=256

You'll need to unmount and remount the fs in between to remove the file
from pagecache.  Or use fadvise() to remove the pagecache.  There's a
little tool which does that in 

http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz

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