[Comments copied from other bug report:] 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; Instead, these processes showed up as 'system' load, and they also sped up my CPU despite cpufreq being set to ignore 'nice' loads. -- 2.6.24-2: Regression with idle cpu cycle handling https://bugs.launchpad.net/bugs/177713 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
