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SubjectRe: Odd IDE performance drop 2.4 vs 2.6?
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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