21.11.2011 15:30, Luigi Rizzo пишет: > On Mon, Nov 21, 2011 at 01:23:22PM +0700, Eugene Grosbein 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. > > apart from the scaling on number of cores (e.g. if you have 8 cores > the 15% becomes a bare 2%)
I have 4 cores (no hyperthreading) and it seems that "top -SHP" does not scale anything in this mode. > remember that percentages are computed > with some kind of filtering (EWMA ?) so if the load of dummynet threads > is bursty, the filter might eat most of it. I do not understand what this filter is. Btw, dummynet load is steady here. > not completely sure this explains a steady 0.00%, if that's is > what you are seeing Yes, I see 0.00% except of hours of most load where top shows about 10% and ps shows about 30%. Eugene Grosbein _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
