Messages in this thread |  | | | From | Paolo Ornati <> | | Subject | Re: Strange IDE performance change in 2.6.1-rc1 (again) | | Date | Wed, 7 Jan 2004 21:12:35 +0100 |
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On Wednesday 07 January 2004 20:23, Ram Pai wrote: > > I tried on my lab machine with scsi disks. (I dont have access currently > to a spare machine with ide disks.) > > I find that reverting the changes in mm/filemap.c and then reverting the > lazy-read optimization gives much better sequential read performance on > blockdevices. Is this your observation on IDE disks too?
Yes and No. I have only tried to revert lazy-read optimization (without any visible change) so I have reapplied it AND THAN I have reverted changes in mm/filemap.c... and performance has gone back.
> > > I don't know why... but it does. > > Lets see. I think my theory is partly the reason. But the changes in > filemap.c seems to be influencing more.
YES, I agree. I haven't done a lot of tests but it seems to me that the changes in mm/filemap.c are the only things that influence the sequential read performance on my disk.
-- Paolo Ornati Linux v2.4.23
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