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Message-ID: <19834.1179710073@turing-police.cc.vt.edu>
Date: Sun, 20 May 2007 21:14:33 -0400
From: Valdis.Kletnieks@...edu
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
john stultz <johnstul@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
Chris Wright <chrisw@...s-sol.org>,
Arjan van de Ven <arjan@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>, Andi Kleen <ak@...e.de>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86-64 highres/dyntick support 2.6.22-rc1-v7
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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