* Pete Wyckoff <[EMAIL PROTECTED]> wrote: > > pretty sure this is the culprit is that num_possible_cpus() > 1, > > which would mean cpu_possible_map contains the second cpu... but i'm > > not quite sure what the right fix is... or perhaps this is all > > intended. > > We've seen the same problem. We use gettimeofday() for timing of > network-ish operations on the order of 10-50 us. But not having the > TSC makes gettimeofday() itself very slow, on the order of 30 us.
30 usecs is too much - even with pmtimer it's typically below 5 usecs. Could you run this on your box: http://people.redhat.com/mingo/time-warp-test/time-warp-test.c and send back what it reports? (run it for a few minutes) Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
