Messages in this thread | | | Date | Tue, 14 Jun 2005 12:20:18 +1000 | From | Nick Piggin <> | Subject | Re: Odd IDE performance drop 2.4 vs 2.6? |
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Alan Cox wrote:
>On Llu, 2005-06-13 at 15:06, Nick Piggin wrote: > >>>Make sure you have pre-empt disabled and the antcipatory I/O scheduler >>>disabled. >>> >>> >>I don't think that those could explain it. >> > >Try it and see. The anticipatory I/O scheduler does horrible things to >my IDE streaming performance numbers and to swap performance. It tries >to merge I/O by delaying it which is deeply ungood when it comes to IDE >streaming even if its good for general I/O. > > Sure it has regression cases here and there, as you would expect. But I'm fairly sure this won't be one of them. If there is just a single process submitting the IO the anticipatory scheduler should completely turn of any delays, and degenerate basically to the deadline scheduler.
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