diff options
author | 2009-09-10 20:34:48 +0200 | |
---|---|---|
committer | 2009-09-10 20:34:48 +0200 | |
commit | 3f2aa307c4d26b4ed6509d0a79e8254c9e07e921 (patch) | |
tree | 97514a19722ffe1f7a973868bf670177b671d3a5 /kernel/power/snapshot.c | |
parent | sched: Keep kthreads at default priority (diff) | |
download | linux-3f2aa307c4d26b4ed6509d0a79e8254c9e07e921.tar.gz linux-3f2aa307c4d26b4ed6509d0a79e8254c9e07e921.tar.bz2 linux-3f2aa307c4d26b4ed6509d0a79e8254c9e07e921.zip |
sched: Disable NEW_FAIR_SLEEPERS for now
Nikos Chantziaras and Jens Axboe reported that turning off
NEW_FAIR_SLEEPERS improves desktop interactivity visibly.
Nikos described his experiences the following way:
" With this setting, I can do "nice -n 19 make -j20" and
still have a very smooth desktop and watch a movie at
the same time. Various other annoyances (like the
"logout/shutdown/restart" dialog of KDE not appearing
at all until the background fade-out effect has finished)
are also gone. So this seems to be the single most
important setting that vastly improves desktop behavior,
at least here. "
Jens described it the following way, referring to a 10-seconds
xmodmap scheduling delay he was trying to debug:
" Then I tried switching NO_NEW_FAIR_SLEEPERS on, and then
I get:
Performance counter stats for 'xmodmap .xmodmap-carl':
9.009137 task-clock-msecs # 0.447 CPUs
18 context-switches # 0.002 M/sec
1 CPU-migrations # 0.000 M/sec
315 page-faults # 0.035 M/sec
0.020167093 seconds time elapsed
Woot! "
So disable it for now. In perf trace output i can see weird
delta timestamps:
cc1-9943 [001] 2802.059479616: sched_stat_wait: task: as:9944 wait: 2801938766276 [ns]
That nsec field is not supposed to be that large. More digging
is needed - but lets turn it off while the real bug is found.
Reported-by: Nikos Chantziaras <realnc@arcor.de>
Tested-by: Nikos Chantziaras <realnc@arcor.de>
Reported-by: Jens Axboe <jens.axboe@oracle.com>
Tested-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <4AA93D34.8040500@arcor.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/power/snapshot.c')
0 files changed, 0 insertions, 0 deletions