Messages in this thread | | | Date | Thu, 21 Nov 2002 17:08:53 -0800 | From | William Lee Irwin III <> | Subject | Re: 2.5.48-mm1 |
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On Thu, Nov 21, 2002 at 04:04:25PM -0500, Bill Davidsen wrote: > This is purely a performance decision. If you want to avoid bad latency on > reads then you have to throttle writes. The loop_thread will make the > system just as slow as a user application writing the same number of > pages. > If you want io scheduling you will deliberately slow writes to let reads > happen in reasonable time. And vice-versa I imagine, although I don't > think I've seen that case.
Not entirely so. This is just a scheduling decision that has to discriminate between blocking and nonblocking requests and prevent starvation of the blocking requests. Write throttling is an oversimplification that functions poorly.
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