On 2014-10-14 11:08 AM, Martin Pitt wrote: > 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.
The change to the Deadline scheduler also improves responsiveness when a desktop user is copying large files or using VM software. I suspect switching this back to CFQ will improve issues with Balloo, at the expense of Kubuntu users who copy large files or use virtual machines. For this reason, I also disagree this change is limited in impact. > >> 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). Marc. -- technical-board mailing list technical-board@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/technical-board
