On Tuesday 13 November 2001 16:21, Roy Sigurd Karlsbakk wrote:
> Hi
>
> I heard linux does <= 32 page readahead from block devices
> (scsi/ide/que?). Is there a way to double this? I want to read 256kB
> chunks from the SCSI drives, as to get the best speed. These numbers are
> based on some testing and information I've got from Compaq's storage guys.
>
> roy
Note that the interface to /proc/ide/hdX/settings still is buggy...
i.e you should be able to do (in pages):
echo "file_readahead:64" > /proc/ide/hdX/settings
but the result will be a readahead of 128*1024 PAGES... and that
is too much... (even 1024 PAGES is too much)
(after patch, in kB)
echo "file_readahead:256" > /proc/ide/hdX/settings
It is likely that there are more settings in the ide subsystem that is
has this fault... (Andre, I keep repeating myself...)
/RogerL
-- Roger Larsson Skellefteċ Sweden--------------Boundary-00=_TPLRJJPFNRPIZSC0DEI8 Content-Type: text/x-diff; charset="iso-8859-1"; name="patch-2.4.11-pre2-ide_settings" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="patch-2.4.11-pre2-ide_settings"
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