Package: kernel Severity: normal
Hi, here is a scenario to illustrate the problem: - run low priority processes with a 19 nice value (for example distributed-net aka dnetc) under the identity of a specific user (daemon) - run a normal priority process under the identity of a another user (for example burnP6 from the cpuburn package) Traditional and expected Unix behavior is to give dnetc a small share of the CPU and burnP6 should have a large share of the CPU. However here is the CPU distribution according to "top" on a dual core system: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 27870 daemon 39 19 704 428 336 R 100 0.0 1:01.24 dnetc 28653 daemon 39 19 704 204 112 R 50 0.0 0:56.02 dnetc 29615 bonnaud 20 0 96 16 8 R 50 0.0 0:08.64 burnP6 [...] According to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/188226 this can be fixed by changing the kernel configuration. Here is what is used in Debian: $ grep GROUP_SCHED /boot/config-2.6.25-2-686 CONFIG_GROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y # CONFIG_RT_GROUP_SCHED is not set # CONFIG_CGROUP_SCHED is not set and here is what is used in Ubuntu: $ grep GROUP_SCHED /boot/config-2.6.24-19-generic CONFIG_FAIR_CGROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y -- System Information: Debian Release: lenny/sid APT prefers unstable APT policy: (500, 'unstable'), (1, 'experimental') Architecture: i386 (i686) Kernel: Linux 2.6.25-2-686 (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash -- Laurent Bonnaud. http://www.lis.inpg.fr/pages_perso/bonnaud/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
