Messages in this thread | | | Date | Sat, 5 Jan 2002 12:33:46 +0100 | From | Jens Axboe <> | Subject | Re: [2.5.2-pre3] Harddisk Performance |
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On Fri, Jan 04 2002, Peter Osterlund wrote: > Jens Axboe <axboe@suse.de> writes: > > > On Sat, Dec 29 2001, Heinz Diehl wrote: > > > > > > Running 2.5.2-pre3, hdparm shows up very poor harddisk performance > > > on my system compared to 2.4.x: > > > > Yes I just noticed that too (someone else reported it) -- seems to be > > due to missed merges, I'm investigating. > > I have found that if the elevator says BACK_MERGE or FRONT_MERGE, but > the request queue doesn't allow the merge, the request will be put > last in the queue instead of next to the request where the merge would > have been done if allowed.
Excellent spotting! Applied.
-- Jens Axboe
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