Re: Fwd: [PATCH 0/5] cfq-iosched: improve latency for no-idle queues (v3)

From: Jeff Moyer
Date: Tue Nov 03 2009 - 17:00:36 EST

Jens Axboe <jens.axboe@xxxxxxxxxx> writes:

> On Tue, Nov 03 2009, Jeff Moyer wrote:
>> Jens Axboe <jens.axboe@xxxxxxxxxx> writes:
>> > Since for-linus contains conflicting changes, can you and Jeff please
>> > double check that everything is still in order? The interesting bit here
>> > is the merge with for-2.6.33 and the coop limit from Shaohua Li. I did
>> > the straight forward merge, but we likely just need to drop that logic
>> > since the coop concept is radically different given that we merge and
>> > break queues in for-2.6.33.
>> Yeah, since I changed the meaning of the cfqq_coop flag, a lot of those
>> tests are just plain wrong. Let me play with it and I'll send you an
>> incremental patch in a bit.
> Thanks, here's what I have. It's basically a revert of the commit in
> question.

Your patch looks like a straight-forward revert. I still think we need
some guards in place, though. For now, I think we can go with what you
have, and I'll come up with some other mechanism to deal with this case.

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