On 09/14/10 10:29, Michael Tokarev wrote: > For comparison, here's the same strace stats without -usbdevice: > > % time seconds usecs/call calls errors syscall > ------ ----------- ----------- --------- --------- ---------------- > 97.70 0.080237 22 3584 select > 1.09 0.000895 0 6018 3584 read > 0.33 0.000271 0 9670 clock_gettime > 0.31 0.000254 0 6086 gettimeofday > 0.26 0.000210 0 2432 rt_sigaction > 0.17 0.000137 0 3653 timer_gettime > 0.15 0.000122 0 2778 timer_settime > 0.00 0.000000 0 1 ioctl > 0.00 0.000000 0 1 rt_sigpending > 0.00 0.000000 0 1 1 rt_sigtimedwait > ------ ----------- ----------- --------- --------- ---------------- > 100.00 0.082126 34224 3585 total > > Yes, it is still doing lots of unnecessary stuff, but the load > is <1%. Without a USB device attached the controller is turned off. See the call to qemu_del_timer() in uhci_frame_timer(). As soon as you add the tablet device the polling starts (see qemu_mod_timer in uhci_ioport_writew) and the cpu load starts. David > > (This is without host_alarm_handler() in qemu_notify_event()) > > /mjt > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
