Marcelo Tosatti wrote: > On Thu, Apr 24, 2008 at 10:37:04AM +0200, Gerd Hoffmann wrote: >> Hi folks, >> >> My first attempt to send out a patch series with git ... >> >> The patches fix the kvm paravirt clocksource code to be compatible with >> xen and they also factor out some code which can be shared into a >> separate source files used by both kvm and xen. > > The issue with SMP guests is still present. Booting with "nohz=off" resolves > it. > > Same symptoms as before, apic_timer_fn for one of the vcpu's is ticking way > slower > than the remaining ones: > > [EMAIL PROTECTED] ~]# cat /proc/timer_stats | grep apic > 391, 4125 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 2103, 4126 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 1896, 4127 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 1857, 4128 qemu-system-x86 apic_mmio_write (apic_timer_fn)
What userspace version is this? With iothread support? Or older one where the vcpu0 thread also handles all the I/O? Is 4x neeed to reproduce or do you see it with 2x too? What host? A quick test with xenner (which has a separate I/O thread) didn't show anything unusual. Going investigate ... cheers, Gerd -- http://kraxel.fedorapeople.org/xenner/ ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
