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Update colocation and boost min_util values

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Signed-off-by: Tyler Nijmeh <tylernij@gmail.com>
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Tyler Nijmeh 2020-08-24 09:29:37 -07:00
parent 8a69b73d6b
commit 15e4db9c81
2 changed files with 10 additions and 6 deletions
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11
README.md
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@ -86,11 +86,14 @@ Set the minimum task scheduling period to 1ms. With kernel.sched_latency_ns set
Increase the time that a task is considered to be cache hot. According to RedHat, increasing this tunable reduces the number of task migrations. This should reduce time spent balancing tasks and increase per-task performance.
See RedHat: https://www.redhat.com/files/summit/session-assets/2018/Performance-analysis-and-tuning-of-Red-Hat-Enterprise-Linux-Part-1.pdf
### kernel.sched_min_task_util_for_boost: 25
This value effects if tasks should be migrated to a higher performant CPU if it's utilization is above this amount. Allow tasks to be migrated upwards if the user is triggering a touch boost and the task is above 25% utilization.
### kernel.sched_min_task_util_for_boost: 35
This value effects if tasks should be migrated to a higher performant CPU if it's utilization is above this amount (during sched_boost). Allow tasks to be migrated upwards if the user is triggering a touch boost and the task is above 35% utilization.
### kernel.sched_min_task_util_for_colocation: 50
This value is the same as the former, except it occurs when the user is **not** touching the screen. We shouldn't upmigrate tasks if the user isn't actively interacting with them (i.e. video streaming).
### kernel.sched_min_task_util_for_colocation: 25
This value is the same as the former, except it occurs only for top-app tasks (which are of greater priority than background tasks). Lower this value a bit to use big clusters more for top-app tasks.
### kernel.sched_min_task_util_for_boost_colocation: 35
This is the same as kernel.sched_min_task_util_for_boost for older kernel versions.
### kernel.sched_nr_migrate: 32 --> 64
When migrating tasks between CPUs, allow the scheduler to migrate twice as many as usual. This should increase scheduling latency marginally, but increase the performance of SCHED_OTHER tasks.

5
system/bin/ktweak
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@ -136,8 +136,9 @@ ctl kernel.sched_tunable_scaling 0
ctl kernel.sched_latency_ns 10000000
ctl kernel.sched_min_granularity_ns 1000000
ctl kernel.sched_migration_cost_ns 1000000
ctl kernel.sched_min_task_util_for_boost 25
ctl kernel.sched_min_task_util_for_colocation 50
ctl kernel.sched_min_task_util_for_boost 35
ctl kernel.sched_min_task_util_for_colocation 25
ctl kernel.sched_min_task_util_for_boost_colocation 35
ctl kernel.sched_nr_migrate 64
ctl kernel.sched_schedstats 0
ctl kernel.sched_wakeup_granularity_ns 5000000