On Fri, 18 May 2007 00:09:53 +0200, Thomas Gleixner said: > Broken out version is available here: > http://www.tglx.de/projects/hrtimers/2.6.22-rc1/linux-2.6.22-rc1-x86_64-highres-v7.patches.tar.bz2 By the time I got there, you'd put the -v8 version out there. It applied to a 2.6.22-rc1-mm1 tree with only minor bashing (basically, the patches clocksource-fix-mismerge.diff and clocksource-watchdog-resumed-lockless.patch appear to already be in -rc1-mm1, and hpet-check-counter.diff in a ever-so slightly different form). I also threw on the 22-rc1 patch from linuxpowertop to tweak some timeouts in the kernel... Boots and runs on a Dell Latitude D820 laptop with an Intel Core2 T7200. Intel's 'powertop' was reporting as low as 25 wakeups/sec in single-user mode, even with CONFIG_HZ=1000. This is looking like a good -mm candidate... Some 'powertop' results (I'm not at all clear why it's reporting 3000+ wakeups/ sec on the non-NOHZ kernels with HZ=1000. I can see 1000, or 2000 because it's a dual-core, but 3000?). It doesn't look like NOHZ gains me a *lot* of extra battery time, but a bit (I believe the wattages to be reasonably accurate, the 'hours left' to be a crock...). -rc1-mm1 with X desktop running: Cn Avg residency (5s) Long term residency avg C0 (cpu running) (18.8%) C1 0.0ms ( 0.0%) 0.0ms C2 0.3ms ( 2.6%) 0.3ms C3 0.5ms (78.6%) 0.5ms Wakeups-from-idle per second : 3183.2 Power usage (ACPI estimate) : 27.4 W (2.7 hours left) Top causes for wakeups: 16.4% (62.4) <interrupt> : nvidia 13.2% (50.0) S06cpuspeed : queue_delayed_work_on (delayed_work_timer_ 12.6% (48.0) esd : schedule_timeout (process_timeout) 8.4% (31.8) gkrellm : schedule_timeout (process_timeout) 7.7% (29.2) <interrupt> : uhci_hcd:usb4 6.6% (25.2) Xorg : do_setitimer (it_real_fn) 6.6% (25.0) <interrupt> : uhci_hcd:usb3, HDA Intel 5.3% (20.0) gyachi : schedule_timeout (process_timeout) 3.3% (12.6) e16 : schedule_timeout (process_timeout) 2.6% (10.0) <kernel core> : ehci_work (ehci_watchdog) Suggestion: Enable the CONFIG_NO_HZ kernel configuration option. -rc1-mm1-hrt8 with X desktop running: Cn Avg residency (5s) Long term residency avg C0 (cpu running) ( 8.5%) C1 0.0ms ( 0.0%) 0.0ms C2 0.8ms ( 8.3%) 1.0ms C3 1.5ms (83.2%) 1.5ms Wakeups-from-idle per second : 1290.0 Power usage (ACPI estimate) : 26.8 W (2.7 hours left) Top causes for wakeups: 23.8% (62.0) <interrupt> : nvidia 15.8% (41.2) S06cpuspeed : queue_delayed_work_on (delayed_work_timer_ 14.6% (38.0) gkrellm : schedule_timeout (process_timeout) 8.7% (22.6) Xorg : do_setitimer (it_real_fn) 7.6% (19.8) gyachi : schedule_timeout (process_timeout) 3.8% (10.0) <kernel core> : ehci_work (ehci_watchdog) 3.4% ( 8.8) e16 : schedule_timeout (process_timeout) 3.2% ( 8.4) firefox-bin : futex_wait (hrtimer_wakeup) 3.1% ( 8.0) <kernel core> : usb_hcd_poll_rh_status (rh_timer_func) 2.5% ( 6.6) pcscd : schedule_timeout (process_timeout) -rc1-mm1 single-user: C0 (cpu running) (10.0%) C1 0.0ms ( 0.0%) 0.0ms C2 0.5ms ( 0.0%) 0.6ms C3 0.6ms (90.0%) 0.6ms Wakeups-from-idle per second : 3003.0 Power usage (ACPI estimate) : 24.5 W (3.1 hours left) Top causes for wakeups: 42.1% ( 8.0) <kernel core> : usb_hcd_poll_rh_status (rh_timer_func) 26.3% ( 5.0) <kernel core> : fbcon_add_cursor_timer (cursor_timer_handl 14.7% ( 2.8) <kernel core> : queue_delayed_work_on (delayed_work_timer_ 6.3% ( 1.2) <interrupt> : libata 5.3% ( 1.0) kedac : schedule_timeout (process_timeout) 1.1% ( 0.2) init : schedule_timeout (process_timeout) 1.1% ( 0.2) <kernel core> : page_writeback_init (wb_timer_fn) 1.1% ( 0.2) pdflush : blk_plug_device (blk_unplug_timeout) 1.1% ( 0.2) <kernel core> : neigh_table_init_no_netlink (neigh_periodi 1.1% ( 0.2) rc.sysinit : start_this_handle (commit_timeout) Suggestion: Enable the CONFIG_NO_HZ kernel configuration option. -rc1-mm1-hrt8 single-user: Cn Avg residency (5s) Long term residency avg C0 (cpu running) ( 0.1%) C1 0.0ms ( 0.0%) 0.0ms C2 1.9ms ( 0.2%) 1.9ms C3 58.6ms (99.7%) 58.6ms Wakeups-from-idle per second : 36.0 Power usage (ACPI estimate) : 23.2 W (2.9 hours left) Top causes for wakeups: 48.2% ( 8.0) <kernel core> : usb_hcd_poll_rh_status (rh_timer_func) 30.1% ( 5.0) <kernel core> : fbcon_add_cursor_timer (cursor_timer_handl 12.0% ( 2.0) <kernel core> : queue_delayed_work_on (delayed_work_timer_ 6.0% ( 1.0) kedac : schedule_timeout (process_timeout) 1.2% ( 0.2) init : schedule_timeout (process_timeout) 1.2% ( 0.2) <kernel core> : neigh_table_init_no_netlink (neigh_periodi 1.2% ( 0.2) rc.sysinit : start_this_handle (commit_timeout)
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