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authorSebastien Rannou <mxs@sbrk.org>2015-02-13 15:55:03 +0100
committerDaniel Lezcano <daniel.lezcano@linaro.org>2015-03-13 18:31:29 +0100
commitce6031c89a35cffd5a5992b08377b77f49a004b9 (patch)
tree60706985fee58019f3028ac2206049a8ed60a92a /drivers/cpuidle
parent43b68879de27b1993518687fbc6013da80cdcbfe (diff)
downloadop-kernel-dev-ce6031c89a35cffd5a5992b08377b77f49a004b9.zip
op-kernel-dev-ce6031c89a35cffd5a5992b08377b77f49a004b9.tar.gz
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>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle-mvebu-v7.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/cpuidle/cpuidle-mvebu-v7.c b/drivers/cpuidle/cpuidle-mvebu-v7.c
index cefa074..980151f 100644
--- a/drivers/cpuidle/cpuidle-mvebu-v7.c
+++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
@@ -50,17 +50,17 @@ static struct cpuidle_driver armadaxp_idle_driver = {
.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,
.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 = MVEBU_V7_FLAG_DEEP_IDLE,
.name = "MV CPU DEEP IDLE",
.desc = "CPU and L2 Fabric power down",
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