Public bug reported:
I usually run two instances of [EMAIL PROTECTED], using schedtool to assign
each to a different CPU core, and both to nice +19 and SCHED_IDLEPRIO.
Since booting the 2.6.24 -generic kernels, my system has become severely
sluggish -- it will take somewhere between 1/4 and 1/2 second
(subjectively) for a character to appear on-screen after hitting the
key. This happens with both Metacity and Compiz-Fusion (using git
version). Switching to the NV driver reduces this sluggishness
slightly, but it's still subjectively worse than the 2.6.22 kernel ever
was at its worst.
Stopping my 'niced' [EMAIL PROTECTED] processes immediately alleviates this
severe sluggishness, so it seems that somehow these 'nice' tasks are
being given a too high priority. I believe this most likely has
something to do with the new CFS scheduler in the 2.6.24 kernel.
I tried to reproduce this using a simple busy loop in bash, and with
'yes', and by using cat /dev/zero or cat /dev/urandom > /dev/null, each
niced to +19 and SCHED_IDLEPRIO, but for some reason, these did not
create the same sluggishness that [EMAIL PROTECTED] creates. In addition,
these loads did not show up as 'nice' in my Gnome system monitor panel
applet, and they also sped up my CPU despite cpufreq being set to ignore
'nice' loads. Instead, these processes showed up as 'system' load.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Severe sluggishness under 'nice' load in 2.6.24 kernels
https://bugs.launchpad.net/bugs/178807
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