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| author | Ingo Molnar <mingo@elte.hu> | 2008-06-19 16:32:14 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-06-21 22:24:57 -0700 |
| commit | 384353364373c7c9f8134a847a35e27642cb6dae (patch) | |
| tree | d4191107a9bcd8a1d7288330673054272c3ace15 /arch/x86/kernel/mpparse_32.c | |
| parent | b2e4b1cc4a1bfa05582949065a2c97ce7ab3caa3 (diff) | |
x86: remove mwait capability C-state check
back-ported from upstream commit a738d897b7b03b83488ae74a9bc03d26a2875dc6 by Vegard Nossum
Vegard Nossum reports:
| powertop shows between 200-400 wakeups/second with the description
| "<kernel IPI>: Rescheduling interrupts" when all processors have load (e.g.
| I need to run two busy-loops on my 2-CPU system for this to show up).
|
| The bisect resulted in this commit:
|
| commit 0c07ee38c9d4eb081758f5ad14bbffa7197e1aec
| Date: Wed Jan 30 13:33:16 2008 +0100
|
| x86: use the correct cpuid method to detect MWAIT support for C states
remove the functional effects of this patch and make mwait unconditional.
A future patch will turn off mwait on specific CPUs where that causes
power to be wasted.
Bisected-by: Vegard Nossum <vegard.nossum@gmail.com>
Tested-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/x86/kernel/mpparse_32.c')
0 files changed, 0 insertions, 0 deletions