[Intel-gfx] [PATCH 4/4] cpuidle: Hack iowait weighting to avoid C-state reduction for graphics.
yakui.zhao at intel.com
Tue Nov 2 05:20:14 PDT 2010
On Tue, 2010-11-02 at 04:23 +0800, Eric Anholt wrote:
> Improves nexuiz performance by about 1% on my system.
CC: Arjan and linux-acpi mailing list.
It seems that the selection of C-state will become very sensitive to IO
wait after the multi factor is changed from 10 to 1000.
Maybe only one IO/wait will bring that the system can't enter the deep
> Signed-off-by: Eric Anholt <eric at anholt.net>
> drivers/cpuidle/governors/menu.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
> diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
> index f508690..9bb5654 100644
> --- a/drivers/cpuidle/governors/menu.c
> +++ b/drivers/cpuidle/governors/menu.c
> @@ -175,7 +175,7 @@ static inline int performance_multiplier(void)
> mult += 2 * get_loadavg();
> /* for IO wait tasks (per cpu!) we add 5x each */
> - mult += 10 * nr_iowait_cpu(smp_processor_id());
> + mult += 1000 * nr_iowait_cpu(smp_processor_id());
> return mult;
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