On Wed, Oct 08, 2014 at 10:20:23AM -0700, Steve Langasek wrote: > On Wed, Oct 08, 2014 at 05:42:48PM +0100, Colin Ian King wrote: > > > Also, what exactly do you mean when you say baloo doesn't "implement > > > ionice > > > support"? The 'ionice' tool is part of the base system (util-linux). It > > > would be a simple matter of packaging to always run baloo under ionice.
> > Linux supports I/O scheduling priorities since 2.6.13 just with the CFQ > > io scheduler. > Sorry, I don't understand. Do you mean that 'ionice' doesn't help when > using the deadline scheduler? Ok, I've caught up on the IRC discussion on this and have a better understanding now. To summarize: - baloo does use ionice, but ionice has no effect when the deadline scheduler is used. There is also no equivalent to ionice for deadline that would let baloo declare that it should be given lower priority. - benchmarks for deadline vs. cfq on rotational disks are mixed; and the change to use deadline was done in part *because of* applications being i/o-starved and unresponsive on the Ubuntu desktop, which was mitigated by this switch. - due to the lack of per-process userspace controls on the deadline scheduler, overriding the kernel scheduler seems to be the only way to give a reasonable experience for kubuntu on rotational disks So while I still don't agree that this is free of risk of regression (e.g., a system with both kubuntu and ubuntu desktops installed could see a direct regression under the ubuntu session as a result of this change), I also don't see any better way to fix it. So while I wouldn't be comfortable with a kubuntu-specific udev rule in an SRU, I also wouldn't try to block it. It has been pointed out that Ubuntu also has an indexer, zeitgeist, which apparently doesn't suffer from the same problem. Perhaps the KDE team would want to take a look to understand what zeitgeist is doing differently that makes it compatible with the deadline scheduler. -- Steve Langasek Give me a lever long enough and a Free OS Debian Developer to set it on, and I can move the world. Ubuntu Developer http://www.debian.org/ slanga...@ubuntu.com vor...@debian.org
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