Messages in this thread | | | Date | Tue, 16 Mar 2004 16:23:25 -0800 | From | Jeremy Higdon <> | Subject | Re: [PATCH] per-backing dev unplugging #2 |
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On Tue, Mar 16, 2004 at 08:38:50AM +0100, Jens Axboe wrote: > On Mon, Mar 15 2004, Jeremy Higdon wrote: > > > I wonder why nobody's complained about this before? > > > > Well, some of us have, but probably not very loudly. I had > > naively believed that the global unplug was gone in 2.6. > > Ditching plugging at the water cooler doesn't count as complain, it > needs to get out in the open :-). When Intel posted their patch and
I agree. It's one of those little assumptions that one should not make, but one ends up making anyway. :-) Jbarnes did a prototype of per-queue plug/unplug a couple of years ago for LK2.4, but we didn't see much benefit. Obviously, we gave up too soon.
> numbers, that was the first I heard of it.
One problem we had is that the profiling tools on IA64 are very poor, so we couldn't really tell where the problem was.
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