On Tue, 23 Dec 2014 15:40:22 +0100 Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > A commercial application running on Windows (kvm guest) detects CPU as: > > CPU_0: CPU0, Intel64 Family 6 Model 42 Stepping 1, 64, 64, 2200, > > 078BFBFD000206A1, 10753, CPU 0 > > After some time, without reboot, it detects as: > > CPU_0: CPU0, Intel64 Family 6 Model 42 Stepping 1, 64, 64, 2298, > > 078BFBFD000206A1, 10753, CPU 0 > > > > Windows Server 2012 Control Panel -> System shows CPU as 2.3 GHZ, but after > > reboot it might show 2.2 or 1.97 GHz. > > > > The problem is, that commercial application stops working after it detects > > CPU frequency change (2200 -> 2298 in above case). Is it possible to patch > > qemu-kvm that it shows some constant frquency to the guest? > > Do you know how the application computes the frequency? > > In the case of Windows it's probably some timing loop that is executed > at startup, and the result depends on frequency scaling in the host. > Try adding this to the XML in the meanwhile, and see if the control > panel shows the same value: > > Inside <features>: > > <hyperv> > <relaxed state='on'/> > </hyperv> > > Inside <clock offset='localtime'>: > > <timer name='hypervclock' present='yes'/> > > Paolo It did not help. Today that commecrial application detects 2400, although Control Panel -> System shows 2.20 GHz. So my question again - is it possible to patch qemu-kvm that it shows some constant frequency to the guest? But the answer is probably not, because I don't know how the application computes the frequency... Regards, Nerijus -- 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
