Hi! > > > > > 0.00user 0.00system 0.08 (0m0.081s) elapsed 3.71%CPU > > > > 0.00user 0.00system 0.01 (0m0.013s) elapsed 23.33%CPU > > > > 0.00user 0.00system 0.01 (0m0.019s) elapsed 15.92%CPU > > > > > > > > nohz=off helps a lot. while true; do time sleep 0.0; done does not > > > > have unexpected latencies. > > > > > > does hpet=disable on the boot line also help? (without nohz=off) > > > > hpet-disable helps.. a bit. 200msec latencies are gone. (What is used > > for wakeups in this case?) > > > > pavel@amd:~$ while true; do time sleep 0.01; done > > 0.00user 0.00system 0.01 (0m0.013s) elapsed 22.96%CPU > > 0.00user 0.00system 0.01 (0m0.018s) elapsed 11.05%CPU > > 0.00user 0.00system 0.01 (0m0.013s) elapsed 15.54%CPU > > could you run this while doing the sleep test: > > http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh > > and send us the output? (Enabling CONFIG_TIMER_STATS, CONFIG_SCHED_DEBUG > and CONFIG_SCHEDSTATS would maximize the amount of information.) This was w/o hpet=disable . Do you want me to test with hpet=disable? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Attachment:
cfs-debug-info-2007.11.20-11.51.22.gz
Description: Binary data
- Follow-Ups:
- Re: nohz and strange sleep latencies
- From: Ingo Molnar <[email protected]>
- Re: nohz and strange sleep latencies
- References:
- nohz and strange sleep latencies
- From: Pavel Machek <[email protected]>
- Re: nohz and strange sleep latencies
- From: Ingo Molnar <[email protected]>
- Re: nohz and strange sleep latencies
- From: Pavel Machek <[email protected]>
- Re: nohz and strange sleep latencies
- From: Ingo Molnar <[email protected]>
- nohz and strange sleep latencies
- Prev by Date: Re: CONFIG_IRQBALANCE for 64-bit x86 ?
- Next by Date: Re: [ALSA PATCH] alsa-git merge request
- Previous by thread: Re: nohz and strange sleep latencies
- Next by thread: Re: nohz and strange sleep latencies
- Index(es):
 |