On Wednesday 26 August 2009 3:03:13 pm Linda Messerschmidt wrote: > I'm trying to troubleshoot an intermittent Apache performance problem, > and I've narrowed it down using to what appears to be a brief > whole-system hang that last from 0.5 - 3 seconds. They occur every > few minutes.
One thing to note is that ktrace only logs voluntary context switches (i.e. call to tsleep or waiting on a condition variable). It specifically does not log preemptions or blocking on a mutex, so in theory if your machine was livelocked temporarily that might explain this. -- John Baldwin _______________________________________________ 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"
