Roger Larsson wrote:
>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:
>>
>>[snip]
>> ide_add_setting(drive, "file_readahead", ...
>>&max_readahead[major][minor], NULL);
>>
>>Those calls can be found in ide-cd.c, ide-disk,c and ide-floppy.c
>>
>>[snip]
>>
>>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
>>possible.
>>
>
>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
code garbage.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Feb 15 2002 - 21:00:53 EST