IO scheduler based IO controller V10

Ulrich Lukas stellplatz-nr.13a at
Thu Sep 24 19:20:14 PDT 2009

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,

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
(Message ID: 4AB59CBB.8090907 at

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.


More information about the Containers mailing list