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authorImre Kaloz <kaloz@openwrt.org>2015-04-07 18:13:51 +0000
committerImre Kaloz <kaloz@openwrt.org>2015-04-07 18:13:51 +0000
commitf60fea192338c898305102581db4282d14a653bb (patch)
tree5d486e5bd8d3983196923f017a7790b86ce95c26 /target/linux/mvebu/patches-3.18/061-cpuidle-mvebu-Update-cpuidle-thresholds-for-Armada-X.patch
parent503d845522a6173ff60b826a10c5d49089026ce0 (diff)
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Upstream commits 43b68879de27b1993518687fbc6013da80cdcbfe and ce6031c89a35cffd5a5992b08377b77f49a004b9 improve the cpuidle driver on Armada XP. The latter commit improves performance at the slight expense of power consumption.
Signed-off-by: Claudio Leite <leitec@staticky.com> Signed-off-by: Imre Kaloz <kaloz@openwrt.org> SVN-Revision: 45294
Diffstat (limited to 'target/linux/mvebu/patches-3.18/061-cpuidle-mvebu-Update-cpuidle-thresholds-for-Armada-X.patch')
-rw-r--r--target/linux/mvebu/patches-3.18/061-cpuidle-mvebu-Update-cpuidle-thresholds-for-Armada-X.patch66
1 files changed, 66 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.18/061-cpuidle-mvebu-Update-cpuidle-thresholds-for-Armada-X.patch b/target/linux/mvebu/patches-3.18/061-cpuidle-mvebu-Update-cpuidle-thresholds-for-Armada-X.patch
new file mode 100644
index 0000000000..bc0f1a6f5b
--- /dev/null
+++ b/target/linux/mvebu/patches-3.18/061-cpuidle-mvebu-Update-cpuidle-thresholds-for-Armada-X.patch
@@ -0,0 +1,66 @@
+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",