Public bug reported:
Responsiveness of the desktop in Hardy, under CPU load, is significantly
poorer than in previous versions of Ubuntu, on the same hardware.
The easiest way to see it for me is to do this:
1. Downclock my Athlon64 3000 to 1Ghz from 2; this makes things more
noticeable. I also suspect that people running fast machines is why this isn't
reported more. Perhaps especially on multicore machines it won't be significant.
2. Record a long-enough piece in Sound Recorder (doesn't matter what, so long
as you would notice if it didn't play smoothly).
3. Press play, and do Alt-Tab between the Sound Recorder window and e.g.
Firefox, Nautilus, Totem, etc.
The symptom is that sound 'stutters' along with what sounds like static
interference. If the sound recording is music, then it becomes
impossible to listen to in a pleasant manner.
Similar and worse symptoms occur when doing so under CPU load, say when
compiling a big app, applying updates, etc.
This is not a hardware issue, since the same computer was very
responsive under Gutsy (and older versions), even at 1GHz. However, I
state my specs here just for comparison: Athlon64 3000, 512MB RAM, AC'97
onboard sound,
00:11.5 Multimedia audio controller: VIA Technologies, Inc.
VT8233/A/8235/8237 AC97 Audio Controller (rev 60)
and using the NVidia binary driver for video.
My (unfounded, hence I didn't specify a package for this bug) suspicions
are that perhaps the issue is to do with the new CPU scheduler (CFS)
and/or the new sound backend (Pulseaudio). I suspect them only because
they are new, I have no specific evidence against either at this point.
** Affects: ubuntu
Importance: Undecided
Status: New
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Bad multitasking / responsiveness in Hardy
https://bugs.launchpad.net/bugs/190754
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