Messages in this thread | | | Date | Mon, 6 Apr 2009 08:45:09 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [PATCH 0/8][RFC] IO latency/throughput fixes |
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On Mon, 6 Apr 2009, Jens Axboe wrote: > > > Jens - I can just apply this queue (I want to test it out anyway), or if > > you prefer I can pull from you. Just tell me. > > Whatever you want, if you want to pull instead of manually applying, > it's: > > git://git.kernel.dk/linux-2.6-block.git blk-latency
Ok, I applied them for testing anyway, so I think I'll just keep the series I have in my tree. I'm keeping my nasty "dd+sync" going in the background, just to verify that things really feel better, but I'm already convinced this is a winner. Especially with the request size limiter, I can really read email _almost_ as if nothing else was going on on the machine.
With that request size limiting, my fsync pauses tend to be in the 250ms range, with a one 0.75s outlier in the last few minutes. I can definitely feel that quarter-second thing, and the .75s pause was a real stutter, but boy what a difference. I don't get the uncontrollable urge to kill that nasty background writer any more.
Linus
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