On Sun, 2013-01-27 at 16:51 +0100, Mike Galbraith wrote: > On Sun, 2013-01-27 at 21:25 +0800, Alex Shi wrote: > > On 01/27/2013 06:35 PM, Borislav Petkov wrote: > > > On Sun, Jan 27, 2013 at 05:36:25AM +0100, Mike Galbraith wrote: > > >> With aim7 compute on 4 node 40 core box, I see stable throughput > > >> improvement at tasks = nr_cores and below w. balance and powersaving. > ... > > > Ok, this is sick. How is balance and powersaving better than perf? Both > > > have much more jobs per minute than perf; is that because we do pack > > > much more tasks per cpu with balance and powersaving? > > > > Maybe it is due to the lazy balancing on balance/powersaving. You can > > check the CS times in /proc/pid/status. > > Well, it's not wakeup path, limiting entry frequency per waker did zip > squat nada to any policy throughput.
monteverdi:/abuild/mike/:[0]# echo powersaving > /sys/devices/system/cpu/sched_policy/current_sched_policy monteverdi:/abuild/mike/:[0]# massive_intr 10 60 043321 00058616 043313 00058616 043318 00058968 043317 00058968 043316 00059184 043319 00059192 043320 00059048 043314 00059048 043312 00058176 043315 00058184 monteverdi:/abuild/mike/:[0]# echo balance > /sys/devices/system/cpu/sched_policy/current_sched_policy monteverdi:/abuild/mike/:[0]# massive_intr 10 60 043337 00053448 043333 00053456 043338 00052992 043331 00053448 043332 00053488 043335 00053496 043334 00053480 043329 00053288 043336 00053464 043330 00053496 monteverdi:/abuild/mike/:[0]# echo performance > /sys/devices/system/cpu/sched_policy/current_sched_policy monteverdi:/abuild/mike/:[0]# massive_intr 10 60 043348 00052488 043344 00052488 043349 00052744 043343 00052504 043347 00052504 043352 00052888 043345 00052504 043351 00052496 043346 00052496 043350 00052304 monteverdi:/abuild/mike/:[0]# Zzzt. Wish I could turn turbo thingy off. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/