Re: [2.5.2-pre3] Harddisk Performance

From: Jens Axboe (axboe@suse.de)
Date: Sat Jan 05 2002 - 06:33:46 EST

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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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