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Date: Thu, 23 Apr 2009 11:18:27 +0000 From: Paolo Ciarrocchi <paolo.ciarrocchi@...il.com> To: Corrado Zoccolo <czoccolo@...il.com> Cc: jens.axboe@...cle.com, Linux-Kernel <linux-kernel@...r.kernel.org> Subject: Re: Reduce latencies for syncronous writes and high I/O priority requests in deadline IO scheduler On 4/22/09, Corrado Zoccolo <czoccolo@...il.com> 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/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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