21.11.2011 23:37, Ryan Stone пишет: > On Mon, Nov 21, 2011 at 1:23 AM, Eugene Grosbein <[email protected]> wrote: >> Hi! >> >> I need to draw graph of dummynet's CPU usage. >> "procstat -t 0" shows me TID (thread id) of dummynet kernel thread. >> "ps -Hxo time,lwp" shows me total CPU time consumed by this thread. >> >> Now I see this time has 9 seconds increase during 60 seconds of real time. >> This should be 9/60=15% CPU usage, but "top -SHP" shows me 0.00% meantime. >> >> Where is my error?
> Which version are you running? 8.1-RELEASE and older have the problem > that the scheduler and the CPU statistics gatherer are driven from the > same clock. For threads that tend to frequently wake up and run for > less than a full tick(dummynet would appear to fall in this category) > this means that CPU usage statistics are never captured at a point > where those threads are running, so top shows 0% for those threads. > > I am told that some relatively recent timer-related work(eventtimer?) > should have resolved the issue, which is definitely in 9.0 and might > be in stable/8 and may even have made it into 8.2-RELEASE. I run 8.2-STABLE of 16 October. During most busy hours top shows some nonzero values but TIME obtained from ps(1) is still several times larger. Eugene Grosbein _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
