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authorKeir Fraser <keir.fraser@citrix.com>2009-11-25 14:06:17 +0000
committerKeir Fraser <keir.fraser@citrix.com>2009-11-25 14:06:17 +0000
commit7d5eee4f2c1424142790c944c8e083d13a295a37 (patch)
tree25a1c470a8706b26ca64748e9ad7cc30cf6bfc11 /tools/libxc/xc_core.c
parent08a0b4ab0d193b8fbb9270b7ab26f527535ba69c (diff)
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cpuidle: Add decaying history logic to menu idle predictor
this patch is ported from linux upstream git commit 816bb611e41be29b476dc16f6297eb551bf4d747 the original description is: " Add decaying history of predicted idle time, instead of using the last early wakeup. This logic helps menu governor do better job of predicting idle time. With this change, we also measured noticable (~8%) power savings on a DP server system with CPUs supporting deep C states, when system was lightly loaded. There was no change to power or perf on other load conditions. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Len Brown <len.brown@intel.com> " In Xen environment, we also observe this patch reduce the idle power fluctuation. In one DP server, when system is purely idle, the watts stdev/average reduce from 6% to 2%. it is helpful for idle power measurement accuracy. There is no performance and power change when system is loaded. Signed-off-by: Yu Ke <ke.yu@intel.com>
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