>On Tuesday den 12 February 2002 11.52, Martin Dalecki wrote:
>>If you are already at it, I would like to ask to you consider seriously
>>the removal of the
>>following entries in the ide drivers /proc control files:
>> ide_add_setting(drive, "file_readahead", ...
>>Those calls can be found in ide-cd.c, ide-disk,c and ide-floppy.c
>>The second of them is trying to control a file-system level constant
>>inside the actual block device driver.
>>This is a blatant violation of the layering principle in software
>>design, and should go as soon as
>It really should go (the only one working is for ide-disk) but
>you need to add another way to tune readahead per disk too...
>Tuning this parameter gives quite a bit improved performance
>when reading from several big files at a time! A diff of two big files
>is enough to show it: from 10MB/s to 25MB/s (2.4.17-rc1)
>(due to less time lost seeking)
We are talking about 2.5.xx. In 2.5.xx the removed parameters just don't
change anything and are simple
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