[Devel] Re: IO scheduler based IO controller V10

[Ulrich Lukas]

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 at 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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