I tested Brian Roger's 2.6.35-rc5 kernel with the scheduling changes and saw little difference on a Intel(R) Core(TM)2 Duo CPU (Thinkpad X300). Here is the powertop output with a firefox browser open:
Wakeups-from-idle per second : 308.9 interval: 15.0s no ACPI power usage estimate available Top causes for wakeups: 30.6% ( 79.3) [kernel scheduler] Load balancing tick 19.2% ( 49.9) [extra timer interrupt] 16.5% ( 42.9) [kernel core] hrtimer_start (tick_sched_timer) 0.1% ( 0.3)D upowerd 5.9% ( 15.2) [iwlagn] <interrupt> 0.3% ( 0.8)D gnome-settings- 4.6% ( 11.9) firefox-bin 4.2% ( 11.0) nautilus 3.9% ( 10.0) syndaemon 3.1% ( 8.1) [kernel core] usb_hcd_poll_rh_status (rh_timer_func) 2.2% ( 5.7) [ahci] <interrupt> 1.6% ( 4.3) [TLB shootdowns] <kernel IPI> 0.0% ( 0.0)D flush-8:0 1.2% ( 3.1) Xorg Compared with the standard Lucid kernel, the Load balancing tick wakeups are down about 10% while the hrtimer_start (tick_sched_timer) are up some. These results compare with using the Karmic kernel where wakeups were halved. Brian: Did you apply the patch noted in the lkml thread I posted above? The claim there is a substantial wakeups reduction with that applied. -- Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo even with only 1 core enabled https://bugs.launchpad.net/bugs/524281 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
