On Wed, Aug 26, 2009 at 4:42 PM, John Baldwin<j...@freebsd.org> wrote: > 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,
I was not aware, thanks. > so in theory if your machine was > livelocked temporarily that might explain this. How would we determine that? We are now able to reproduce this on a test machine, even after slipping in a 7.2-STABLE kernel with KTR enabled. So we have a lot more options now. Unfortunately, I don't really "get" KTR yet. It looks like it has relevant info, but I was unable to correlate its huge timestamps (e.g. 6795522404430562) to ktrace output times (e.g. 1251387606.225544) showing problem areas. What's my best bet from here? _______________________________________________ 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"
