Re: Bad interactive behaviour in 2.5.65-66 (sched.c)

From: Mike Galbraith (
Date: Sat Apr 19 2003 - 22:55:50 EST

At 06:54 PM 3/31/2003 +1000, Nick Piggin wrote:

>Mike Galbraith wrote:
>>At 08:35 AM 3/31/2003 +0200, Jens Axboe wrote:
>>>What drugs are you on? 2.5.65/66 is the worst interactive kernel I've
>>>ever used, it would be _embarassing_ to release a 2.6-test with such a
>>>rudimentary flaw in it. IOW, a big show stopper.
>>It's only horrible when you trigger the problems, otherwise it's wonderful.
>Heh heh, yeah the anticipatory io scheduler is like that too ;)

I gave 2.5.67-mm4 a go yesterday, and let it fsck my old 10gig ext3-ified
source partition (1k bs, 333k files). MAJOR improvement over deadline for
this job. With the deadline scheduler, it takes 30 minutes to fsck this
partition, and when pdflush starts it's dinky little writes, it sounds like
the heads are about to fly through the chassis. The anticipatory scheduler
cuts fsck time in half, and the disk is no longer screams in (seek)
agony. 15 minutes still seems like ages when you're waiting, but it beats
the HECK out of 30 minutes :) Nice work.


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