| Date | Fri, 25 Sep 2009 04:20:14 +0200 | From | Ulrich Lukas <> | Subject | Re: IO scheduler based IO controller V10 |
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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@datenparkplatz.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
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