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Date: Fri, 25 Sep 2009 04:20:14 +0200 From: Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de> To: Vivek Goyal <vgoyal@...hat.com> CC: linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org Subject: Re: IO scheduler based IO controller V10 Vivek Goyal wrote: > Notes: > - With vanilla CFQ, random writers can overwhelm a random reader. > Bring down its throughput and bump up latencies significantly. IIRC, with vanilla CFQ, sequential writing can overwhelm random readers, too. I'm basing this assumption on the observations I made on both OpenSuse 11.1 and Ubuntu 9.10 alpha6 which I described in my posting on LKML titled: "Poor desktop responsiveness with background I/O-operations" of 2009-09-20. (Message ID: 4AB59CBB.8090907@...enparkplatz.de) Thus, I'm posting this to show that your work is greatly appreciated, given the rather disappointig status quo of Linux's fairness when it comes to disk IO time. I hope that your efforts lead to a change in performance of current userland applications, the sooner, the better. Thanks Ulrich -- 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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