Hi folks, Some people have seen responsiveness improvements on desktop systems by enabling the "NO_NEW_FAIR_SLEEPERS" option in the kernel scheduler options.
I thought it'd be fun to try it out with Android on my FR but soon got sick of
reenabling it by hand through adb every time I turned it on so I used this
quick fix to my init.rc to get it going. It does seem a little snappier but
it's hard to tell if it's a real effect or just confirmation bias. ;-)
You'll need a kernel with debugfs enabled and whilst Panicking's images
have it I don't think it's enabled in the new builds on Google Code yet.
cheers,
Chris
--- init.rc.orig 2009-09-27 20:51:59.851716279 +1000
+++ init.rc 2009-09-27 21:00:54.938670547 +1000
@@ -21,10 +21,12 @@
# create mountpoints and mount tmpfs on sqlite_stmt_journals
mkdir /sdcard 0000 system system
mkdir /system
+ mkdir /debug
mkdir /data 0771 system system
mkdir /cache 0770 system cache
mkdir /sqlite_stmt_journals 01777 root root
mount tmpfs tmpfs /sqlite_stmt_journals size=4m
+ mount debugfs - /debug
mount rootfs rootfs / ro remount
@@ -33,6 +35,7 @@
write /proc/cpu/alignment 4
write /proc/sys/kernel/sched_latency_ns 10000000
write /proc/sys/kernel/sched_wakeup_granularity_ns 2000000
+ write /debug/sched_features NO_NEW_FAIR_SLEEPERS
# mount mtd partitions
# Mount /system rw first to give the filesystem a chance to save a
checkpoint
--
Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC
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