[Bug 5471] offline CPU burns more power than idle CPU

2010-12-10 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #17 from Len Brown l...@kernel.org  2010-12-11 04:31:00 ---
My original plan was to add a play_dead to cpuidle drivers,
but I think that peter's solution is simpler, and solves
90% of the problem, which is to say, all the x86 hardware that
has shipped in the last few years supports native MWAIT.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-10 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471


Len Brown l...@kernel.org changed:

   What|Removed |Added

  Attachment #39662|0   |1
is obsolete||




--- Comment #18 from Len Brown l...@kernel.org  2010-12-11 04:42:23 ---
Created an attachment (id=39772)
 -- (https://bugzilla.kernel.org/attachment.cgi?id=39772)
patch vs 2.6.36.y

replace previous 2.6.36.y patch with the correct version.
(this one actually compiles... and has been verified
 with a power meter on 2.6.36.2).

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-10 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #19 from Len Brown l...@kernel.org  2010-12-11 04:44:30 ---
Created an attachment (id=39782)
 -- (https://bugzilla.kernel.org/attachment.cgi?id=39782)
patch vs 2.6.35.y

tested on 2.6.35.9

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #11 from Len Brown l...@kernel.org  2010-12-09 22:30:17 ---
Created an attachment (id=39662)
 -- (https://bugzilla.kernel.org/attachment.cgi?id=39662)
patch vs 2.6.36.y

This patch vs 2.6.36.y consolidates 3 patches upstream in 2.6.37-rc
that address this problem.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #12 from Thomas Renninger tr...@suse.de  2010-12-09 23:08:03 ---
This should not hold the patch off (took long enough until there finally showed
up a solution), just two comments:

It looks like this patch re-implements deep sleep state in smpboot.c?

1) Double sleeping
Looks like it's double sleeping in case of mwait is available, shouldn't it be
something like:
/* Returns error code if mwait is not available */
static inline *int* mwait_play_dead(void)
...
if (mwait_play_dead())
hlt_play_dead();

2) This only works for mwait... 
Thinking of other possibilities for deep sleeping, namely IO triggered
C-states, this would not work?
Instead of double implementing deep sleep something like this would be a
cleaner way?:
if (cpuidle_driver_registered())
cpuidle_enter_deepest_sleep();
else
hlt_play_dead();

This would:
   - need the two functions being implemented in the cpuidle framework
   - not work as long as cpuidle drivers did not get registered..., but it
 shouldn't be a big deal, nobody offlines CPUs at boot time

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #13 from H. Peter Anvin h...@zytor.com  2010-12-09 23:16:47 ---
Play dead and go to sleep are not necessarily the same things -- in
particular, there may be operations that are appropriate when going to sleep
but not when offlining -- e.g. invoking ACPI routines -- and there may be
operations which we can do when we're going to lose state anyway, i.e. entered
an otherwise-disabled MWAIT state.

That doesn't mean this couldn't be added to the cpuidle framework, but using
the cpuidle framework as it currently sits would be unacceptably dangerous.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #14 from Thomas Renninger tr...@suse.de  2010-12-09 23:30:31 ---
 there may be operations that are appropriate when going to sleep but not when 
  offlining -- e.g. invoking ACPI routines
Going to ACPI driven sleep states from cpuidle should not invoke ACPI
routines, just read an IO address. But I see the point (and I have to double
check). Any other requirements?
cpuidle_enter_deepest_sleep() must of course not sleep/lock before going to
idle.
If I have a lot of time I try to clean this further up if it makes sense.

Whatabout the double sleep?

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #15 from H. Peter Anvin h...@zytor.com  2010-12-09 23:33:14 ---
No, it should be cpuidle_play_dead() if anything.

There is no double sleep.   The play_dead routines never return if successful.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471


Len Brown l...@kernel.org changed:

   What|Removed |Added

 Status|RESOLVED|CLOSED




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[Bug 5471] offline CPU burns more power than idle CPU

2010-12-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #16 from Thomas Renninger tr...@suse.de  2010-12-10 00:10:59 ---
Thanks.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-09-26 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471


Zhang Rui rui.zh...@intel.com changed:

   What|Removed |Added

 Status|ASSIGNED|RESOLVED
 Resolution||PATCH_ALREADY_AVAILABLE




--- Comment #10 from Zhang Rui rui.zh...@intel.com  2010-09-27 00:22:41 ---
Mark this bug report as resolved because patch is already available.
we can close it when the patch is shipped in the upstream kernel.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-09-20 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471


Thomas Renninger tr...@suse.de changed:

   What|Removed |Added

 CC||a.p.zijls...@chello.nl

H. Peter Anvin h...@zytor.com changed:

   What|Removed |Added

 CC||h...@zytor.com




--- Comment #9 from H. Peter Anvin h...@zytor.com  2010-09-20 22:52:58 ---
Code currently in x86:tip/idle... assuming it doesn't fail in testing we'll
push it to Linus in the next merge window.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-04-29 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=5471


Thomas Renninger tr...@suse.de changed:

   What|Removed |Added

 CC||a.p.zijls...@chello.nl




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[Bug 5471] offline CPU burns more power than idle CPU

2010-03-11 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


Zhang Rui rui.zh...@intel.com changed:

   What|Removed |Added

 CC||l...@kernel.org,
   ||rui.zh...@intel.com
 AssignedTo|venkatesh.pallip...@gmail.c |shaohua...@intel.com
   |om  |




--- Comment #8 from Zhang Rui rui.zh...@intel.com  2010-03-12 03:35:40 ---
re-assign to Shaohua as Venki will not look at this any more.

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[Bug 5471] offline CPU burns more power than idle CPU

2010-03-02 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


Holger Macht hol...@homac.de changed:

   What|Removed |Added

 CC||hol...@homac.de




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[Bug 5471] offline CPU burns more power than idle CPU

2010-02-17 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471





--- Comment #7 from Abhishek J abhir...@gmail.com  2010-02-17 21:44:22 ---
hello all, i finally got time around to patch and test this.

patched 2.6.32-5 with the `unaccepted patch` and it seems to work.

reduction of about 4-5 W per core shut for an i7 920. compared with C6 state
enabled.

So any reason for using/not using this patch?

Thanks!

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[Bug 5471] offline CPU burns more power than idle CPU

2010-01-21 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


Alan a...@lxorguk.ukuu.org.uk changed:

   What|Removed |Added

 Kernel Version|2.6.14  |2.6.32
 Regression|--- |No




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[Bug 5471] offline CPU burns more power than idle CPU

2010-01-21 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


Thomas Renninger tr...@suse.de changed:

   What|Removed |Added

 CC||venkatesh.pallip...@intel.c
   ||om




--- Comment #6 from Thomas Renninger tr...@suse.de  2010-01-21 12:58:24 ---
For reference:
There has been an unaccepted approach by Venki:
http://lkml.indiana.edu/hypermail/linux/kernel/0905.2/02692.html
Adding Venkatesh to CC list, should this one be assigned to you?

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[Bug 5471] offline CPU burns more power than idle CPU

2010-01-21 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


Venkatesh Pallipadi venkatesh.pallip...@intel.com changed:

   What|Removed |Added

 Status|REOPENED|ASSIGNED
 AssignedTo|l...@kernel.org |venkatesh.pallip...@intel.c
   ||om




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[Bug 5471] offline CPU burns more power than idle CPU

2010-01-20 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


Abhishek J abhir...@gmail.com changed:

   What|Removed |Added

 CC||abhir...@gmail.com




--- Comment #5 from Abhishek J abhir...@gmail.com  2010-01-21 03:01:37 ---
I can attest this happening with i7 920 processor 

With the watts-up-pro wattmeter. on Evga x58 SLI-758 board with C6 state
enabled and HT disabled.

Kernel tested - 2.6.30, 2.6.31, 2.6.32.3,

With all 4 cores running Wattmeter reading median 163 W
With 3 cores running Wattmeter reading median 168 W
With 2 cores running Wattmeter reading median 173 W

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[Bug 5471] offline CPU burns more power than idle CPU

2010-01-19 Thread bugzilla-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


Anders Aagaard aagaa...@gmail.com changed:

   What|Removed |Added

 CC||aagaa...@gmail.com




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[Bug 5471] offline CPU burns more power than idle CPU

2009-03-24 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


a...@lxorguk.ukuu.org.uk changed:

   What|Removed |Added

 CC||a...@lxorguk.ukuu.org.uk
 Status|NEW |REJECTED
 Resolution||INSUFFICIENT_DATA




--- Comment #3 from a...@lxorguk.ukuu.org.uk  2009-03-24 07:56 ---
Closing old stale bugs. If this is still a problem please re-open


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[Bug 5471] offline CPU burns more power than idle CPU

2009-03-24 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


len.br...@intel.com changed:

   What|Removed |Added

 Status|REJECTED|REOPENED
 Resolution|INSUFFICIENT_DATA   |




--- Comment #4 from len.br...@intel.com  2009-03-24 14:03 ---
re-opened


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[Bug 5471] offline CPU burns more power than idle CPU

2009-03-01 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


rui.zh...@intel.com changed:

   What|Removed |Added

   Severity|normal  |blocking




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[Bug 5471] offline CPU burns more power than idle CPU

2009-01-14 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


mozilla_b...@mail.ru changed:

   What|Removed |Added

 CC||mozilla_b...@mail.ru




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[Bug 5471] offline CPU burns more power than idle CPU

2008-12-15 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


len.br...@intel.com changed:

   What|Removed |Added

 AssignedTo|rui.zh...@intel.com |len.br...@intel.com
 Status|ASSIGNED|NEW




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[Bug 5471] offline CPU burns more power than idle CPU

2008-03-18 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


[EMAIL PROTECTED] changed:

   What|Removed |Added

 AssignedTo|[EMAIL PROTECTED]|[EMAIL PROTECTED]
 Status|NEW |ASSIGNED




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[Bug 5471] offline CPU burns more power than idle CPU

2007-10-31 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


[EMAIL PROTECTED] changed:

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   |m   |




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[Bug 5471] offline CPU burns more power than idle CPU

2007-08-19 Thread bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5471


[EMAIL PROTECTED] changed:

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 AssignedTo|[EMAIL PROTECTED] |[EMAIL PROTECTED]
   ||m
  Component|Config-Hotplug  |Power-Processor
Summary|offline CPU vs idle C-states|offline CPU burns more power
   ||than idle CPU




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