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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 /docs | |
| 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
Diffstat (limited to 'docs')
0 files changed, 0 insertions, 0 deletions