clone 461630 -1 reassign -1 linux-image-2.6.24-1-686 retitle -1 use CONFIG_FAIR_CGROUP_SCHED instead of CONFIG_FAIR_USER_SCHED tags -1 = submitter -1 ! stop Hello, linux-image-2.6.24-1-686 is built with the Completely Fair Scheduler (CONFIG_FAIR_GROUP_SCHED) and it uses userid as basis for grouping tasks (CONFIG_FAIR_USER_SCHED), and therefore provides equal CPU bandwidth to each user. This configuration has a severe impact on e.g. a desktop system where a CPU intensive program with niceness 19 runs under a user that is not the user who uses the desktop. The CPU intensive task gets nearly half of the CPU cycles which results in a sluggish desktop. An example of such a program is boinc-client (from which this bug has been reassigned). A possible solution for this issue is to use CONFIG_FAIR_CGROUP_SCHED instead of CONFIG_FAIR_USER_SCHED and using cgroups to assign different cpu_shares to different tasks. Without any configuration all processes are then in the same cgroup and since niceness is retained in the same cgroup this would restore the behaviour prior to 2.6.24. More information regarding this issue can be found here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/188226 https://bugs.launchpad.net/ubuntu/+source/boinc/+bug/177713 Thanks, -- Frank S. Thomas <fst@debian.org> PGP public key ID: 0xDC426429 Debian Developer finger fst/key@db.debian.org
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