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| author |   Ronan Le Martret <ronan.lemartret@iot.bzh> | 2022-01-28 15:34:25 +0100 |
|---|---|---|
| committer |   Jan-Simon Moeller <jsmoeller@linuxfoundation.org> | 2022-02-02 11:49:26 +0000 |
| commit | d32ed899583ab14e6442f76dd1c78695f9c0ec33 (patch) | |
| tree | 89c94e5dc1feb6855b403649e01088806c8b2282 | |
| parent | a12a83ebdfcd4287264e50edf3b11a156f418ae9 (diff) | |
[RCAR] Fix block device performance decreased
* After the RCAR BSP 5.5.O, the block device performance decreased.
The root cause is a change in the default kernel configuration of the BSP
(CPU Frequency scaling) from (RCAR BSP 4.7.0):
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
\# CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL is not set
To its new default (RCAR BSP 5.5.0)
\# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y
You can check current value at runtime using:
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
cat /sys/devices/system/cpu/cpufreq/policy4/scaling_governor
To mediate the regression we do switch back to the PERFORMANCE governor.
Bug-AGL: SPEC-4205
Signed-off-by: Ronan Le Martret <ronan.lemartret@iot.bzh>
Change-Id: I6d19d92dae9dd8c7977e2034215fce07d8318773
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/27108
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jenkins Job builder account
| -rw-r--r-- | meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/files/Set_GOV_PERFORMANCE.cfg | 2 | ||||
| -rw-r--r-- | meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_%.bbappend | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/files/Set_GOV_PERFORMANCE.cfg b/meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/files/Set_GOV_PERFORMANCE.cfg new file mode 100644 index 000000000..b020174e8 --- /dev/null +++ b/meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/files/Set_GOV_PERFORMANCE.cfg @@ -0,0 +1,2 @@ +CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y +# CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL is not set diff --git a/meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_%.bbappend b/meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_%.bbappend index eccac305a..3665664e0 100644 --- a/meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_%.bbappend +++ b/meta-agl-bsp/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_%.bbappend @@ -8,6 +8,7 @@ SRC_URI:append = " \ " AGL_KCONFIG_FRAGMENTS += "namespace_fix.cfg" +AGL_KCONFIG_FRAGMENTS += "Set_GOV_PERFORMANCE.cfg" # For Xen AGL_KCONFIG_FRAGMENTS += " \ |