[SRU] Set the default IO scheduler to CFQ in Kubuntu Trusty

Rohan Garg rohangarg at kubuntu.org
Thu Oct 9 13:33:13 UTC 2014

On Thu, Oct 9, 2014 at 8:07 AM, Martin Pitt <martin.pitt at ubuntu.com> wrote:
> Steve Langasek [2014-10-08 13:10 -0700]:
>> It has been pointed out that Ubuntu also has an indexer, zeitgeist, which
>> apparently doesn't suffer from the same problem.
> To clarify: For the most part, zeitgeist only stores access events, i.
> e. metadata like "accessed this video at this time". There have been
> some experiments with making it index full file contents, but I don't
> believe we have/use that.
> In earlier Ubuntu releases we used to install various file content
> indexers by default (like tracker), and in the end they all sucked. By
> nature they are using ginormous I/O and nontrivial CPU bandwidth all
> the time, causing both desktop slowdown and much higher battery drain.
> So the desktop team decided some time ago to not install a file
> indexer by default. People who actually do want this can install
> tracker. The desktop slowdown can probably be addressed with some
> clever scheduler/ionice/whatever magic, but the cpu/IO/power usage
> will not go down no matter how you schedule things.
> Martin
> --
> Martin Pitt                        | http://www.piware.de
> Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)
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Just as a side note, the udev rule that I introduced only changes the
scheduler for rotational media. If the disk
is a SSD, there is no change to the scheduler.

Rohan Garg

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