SRU IO Scheduler in Kubuntu 14.04

[Martin Pitt]

Hello Harald, hello TB,

Harald Sitter [2014-10-08 17:03 +0200]:
> I would like to kindly request the TBs input on a possible IO
> scheduler changing SRU for Kubuntu 14.04.

I followed the discussion in the other thread (on u-devel@?).

> As seen in comment #5 of [2] it was suggested to wait until after the
> release of 14.10 and only then proceed with the SRU. Most Kubuntu devs
> do not appear to agree with this as being too conservative an
> approach. The possible fallout is highly limited in impact (could only
> make some things slower) and scope (only could do so on Kubuntu with
> HDD).

I don't agree with the "highly limited in impact", but I do agree with
the compromise of putting the udev rule into kubuntu-default-settings.
While this isn't an appropriate long-term solution (i. e. it
definitively shouldn't be done that way in Utopic or at least not in
V), I don't know of a more appropriate place for an SRU.

> Would the technical board support a swifter resolution of the problem
> or indeed prefer waiting?

I think we shouldn't wait with landing that change in -proposed, but
do it now so that we can start collecting feedback and doing
measurements on this. This will require quite extensive
verification/testing on various hardware, which certainly won't be
done by next week. This should include some positive results for
KDE+balloo on HDD, confirm that the scheduler isn't changed for
KDE+balloo on SSD, and that running Unity/zeitgeist with
kubuntu-default-settings installed doesn't show a significant
regression (some minor timing changes are acceptable, I think).

Thanks,

Martin
-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)