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- From ce6031c89a35cffd5a5992b08377b77f49a004b9 Mon Sep 17 00:00:00 2001
- From: Sebastien Rannou <mxs@sbrk.org>
- Date: Fri, 13 Feb 2015 15:55:03 +0100
- Subject: [PATCH] cpuidle: mvebu: Update cpuidle thresholds for Armada XP SOCs
- Originally, the thresholds used in the cpuidle driver for Armada SOCs
- were temporarily chosen, leaving room for improvements.
- This commit updates the thresholds for the Armada XP SOCs with values
- that positively impact performances:
- without patch with patch vendor kernel
- - iperf localhost (gbit/sec) ~3.7 ~6.4 ~5.4
- - ioping tmpfs (iops) ~163k ~206k ~179k
- - ioping tmpfs (mib/s) ~636 ~805 ~699
- The idle power consumption is negatively impacted (proportionally less
- than the performance gain), and we are still performing better than
- the vendor kernel here:
- without patch with patch vendor kernel
- - power consumption idle (W) ~2.4 ~3.2 ~4.4
- - power consumption busy (W) ~8.6 ~8.3 ~8.6
- There is still room for improvement regarding the value of these
- thresholds, they were chosen to mimic the vendor kernel.
- This patch only impacts Armada XP SOCs and was tested on Online Labs
- C1 boards. A similar approach can be taken to improve the performances
- of the Armada 370 and Armada 38x SOCs.
- Thanks a lot to Thomas Petazzoni, Gregory Clement and Willy Tarreau
- for the discussions and tips around this topic.
- Signed-off-by: Sebastien Rannou <mxs@sbrk.org>
- Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
- Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
- ---
- drivers/cpuidle/cpuidle-mvebu-v7.c | 8 ++++----
- 1 file changed, 4 insertions(+), 4 deletions(-)
- --- a/drivers/cpuidle/cpuidle-mvebu-v7.c
- +++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
- @@ -50,18 +50,18 @@ static struct cpuidle_driver armadaxp_id
- .states[0] = ARM_CPUIDLE_WFI_STATE,
- .states[1] = {
- .enter = mvebu_v7_enter_idle,
- - .exit_latency = 10,
- + .exit_latency = 100,
- .power_usage = 50,
- - .target_residency = 100,
- + .target_residency = 1000,
- .flags = CPUIDLE_FLAG_TIME_VALID,
- .name = "MV CPU IDLE",
- .desc = "CPU power down",
- },
- .states[2] = {
- .enter = mvebu_v7_enter_idle,
- - .exit_latency = 100,
- + .exit_latency = 1000,
- .power_usage = 5,
- - .target_residency = 1000,
- + .target_residency = 10000,
- .flags = CPUIDLE_FLAG_TIME_VALID |
- MVEBU_V7_FLAG_DEEP_IDLE,
- .name = "MV CPU DEEP IDLE",
|
