If I'm just using SDL, does usb tablet provide any benefit?
On Thu, Jun 19, 2008 at 2:34 PM, Anthony Liguori <[EMAIL PROTECTED]> wrote: > Haydn Solomon wrote: >> >> Hi List, >> >> When testing power usage of a windows xp guest using powertop utility, >> I'm noticing high wakeup rates. The following is the output of >> powertop for an idle windows xp guest. >> >> >> ============================== >> =========================== >> Wakeups-from-idle per second : 2716.6 interval: 10.0s >> no ACPI power usage estimate available >> >> Top causes for wakeups: >> 52.4% (2434.4) qemu-system-x86 : sys_timer_settime (posix_timer_fn) >> 21.5% (996.7) qemu-system-x86 : __kvm_migrate_pit_timer (pit_timer_fn) >> 15.0% (697.4) <interrupt> : extra timer interrupt >> 4.9% (227.6) <kernel IPI> : Rescheduling interrupts >> 1.6% ( 72.9) USB device 6-2 : Optical USB Mouse (Logitech) >> 1.3% ( 61.7) <interrupt> : nvidia >> 1.3% ( 59.0) <interrupt> : uhci_hcd:usb4, uhci_hcd:usb6, HDA Intel >> =================================================================== >> >> I'm getting similar values when running a Fedora 9 guest. >> >> My host is running F9. Details of my /proc/cpuinfo : >> >> processor : 1 >> vendor_id : GenuineIntel >> cpu family : 6 >> model : 15 >> model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz >> stepping : 10 >> cpu MHz : 2201.000 >> cache size : 4096 KB >> physical id : 0 >> siblings : 2 >> core id : 1 >> cpu cores : 2 >> fpu : yes >> fpu_exception : yes >> cpuid level : 10 >> wp : yes >> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge >> mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe >> syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor >> ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm ida >> bogomips : 4387.73 >> clflush size : 64 >> cache_alignment : 64 >> address sizes : 36 bits physical, 48 bits virtual >> power management: >> >> The linux image I'm running is Linux localhost.localdomain >> 2.6.25.4-30.fc9.x86_64 #1 SMP Wed May 21 17:34:18 EDT 2008 x86_64 >> x86_64 x86_64 GNU/Linux >> >> I'm starting my vm using the following command: >> >> /usr/local/kvm/bin/qemu-system-x86_64 \ >> -hda windowsxp.img \ >> -m 650 \ >> -localtime \ >> -net user \ >> -net nic,model=e1000 \ >> -smb /home/hsolomon \ >> -std-vga \ >> -soundhw all \ >> -usb \ >> -usbdevice tablet \ >> -name StandardPC-NAT & >> > > USB tablet polls a lot. You'll probably see far less wake ups if you don't > use the tablet. > > With the default options, my idle winxp guest causes about 550 wakeups/sec > which is pretty close to what I'd expect. I don't think you'll get much > better than that without using a dynticks guest. > > Regards, > > Anthony Liguori > >> Thanks >> >> Haydn >> -- >> To unsubscribe from this list: send the line "unsubscribe kvm" in >> the body of a message to [EMAIL PROTECTED] >> 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 [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
