Re: Reduce latencies for syncronous writes and high I/O priority requests in deadline IO scheduler

[Paolo Ciarrocchi]

On 4/22/09, Corrado Zoccolo <czoccolo@xxxxxxxxx> wrote:
> Hi,
> deadline I/O scheduler currently classifies all I/O requests in only 2
> classes, reads (always considered high priority) and writes (always
> lower).
> The attached patch, intended to reduce latencies for syncronous writes
> and high I/O priority requests, introduces more levels of priorities:
> * real time reads: highest priority and shortest deadline, can starve
> other levels
> * syncronous operations (either best effort reads or RT/BE writes),
> mid priority, starvation for lower level is prevented as usual
> * asyncronous operations (async writes and all IDLE class requests),
> lowest priority and longest deadline
>


numbers are impressive.

do you observe better latencies in normal desktop usage as well?

ciao,
-- 
Paolo
http://paolo.ciarrocchi.googlepages.com/
http://mypage.vodafone.it/
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