On 2010-09-20, David Xu wrote: > I redirect all output to a disk file, and it still needs 1 second to > complete, this machine is dual-core pentium E5500, faster than previous > one which is a dual-core AMD 5000+ machine, the 5000+ needs 2 > seconds to complete. > > $/usr/bin/time sysctl -b kern.geom.confdot > sysctl_geom_confdot.txt > 1.00 real 0.00 user 0.00 sys
I couldn't reproduce the problem myself but I bet that it's a lost wakeup in g_waitfor_event(). Can you try this patch? %%% Index: sys/geom/geom_event.c =================================================================== --- sys/geom/geom_event.c (revision 214048) +++ sys/geom/geom_event.c (working copy) @@ -220,11 +220,12 @@ one_event(void) mtx_lock(&g_eventlock); TAILQ_REMOVE(&g_events, ep, events); ep->flag &= ~EV_INPROGRESS; - mtx_unlock(&g_eventlock); if (ep->flag & EV_WAKEUP) { ep->flag |= EV_DONE; wakeup(ep); + mtx_unlock(&g_eventlock); } else { + mtx_unlock(&g_eventlock); g_free(ep); } g_topology_unlock(); @@ -365,11 +366,14 @@ g_waitfor_event(g_event_t *func, void *a va_end(ap); if (error) return (error); - do - tsleep(ep, PRIBIO, "g_waitfor_event", hz); - while (!(ep->flag & EV_DONE)); + + mtx_lock(&g_eventlock); + while (!(ep->flag & EV_DONE)) + msleep(ep, &g_eventlock, PRIBIO, "g_waitfor_event", hz); if (ep->flag & EV_CANCELED) error = EAGAIN; + mtx_unlock(&g_eventlock); + g_free(ep); return (error); } %%% -- Jaakko _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"