Messages in this thread | | | Date | Mon, 6 Apr 2009 19:01:16 +0200 | From | Jens Axboe <> | Subject | Re: [PATCH 0/8][RFC] IO latency/throughput fixes |
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On Mon, Apr 06 2009, Linus Torvalds wrote: > > > 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
No problem, the end result should be identical :-)
> 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.
If we can make the dd writer almost unnoticable, then I think we've come a long way already. That really is a nasty workload.
-- Jens Axboe
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