On Mon, 2014-02-24 at 08:35 +0000, Zhang, Yang Z wrote: > Vadim Rozenfeld wrote on 2014-02-24: > > On Mon, 2014-02-24 at 03:01 +0000, Zhang, Yang Z wrote: > >> Vadim Rozenfeld wrote on 2014-02-14: > >>> On Fri, 2014-02-14 at 02:35 +0000, Liu, RongrongX wrote: > >>>> Vadim Rozenfeld wrote on 2014-02-12: > >>>>> On Wed, 2014-02-12 at 01:33 +0000, Zhang, Yang Z wrote: > >>>>>> Vadim Rozenfeld wrote on 2014-02-10: > >>>>>>> On Mon, 2014-02-10 at 08:21 +0000, Zhang, Yang Z wrote: > >>>>>>>> Hi Vadim, > >>>>>>>> > >>>>>>>> Do you know the latest status of Hyper-v Enlightenments > >>>>>>>> supporting in > >>>>> KVM? > >>>>>>> Like how many Hyper-v interfaces are supported in KVM? > >>>>>>> > >>>>>>> Hi Yang, > >>>>>>> > >>>>>>> There is no many at the moment. KVM currently supports the > >>>>>>> following Hyper-V features: > >>>>>>> > >>>>>>> Guest Spinlocks > >>>>>>> http://msdn.microsoft.com/en-us/library/windows/hardware/ff539 > >>>>>>> 08 > >>>>>>> 1% > >>>>>>> 28v=vs.85%29.aspx > >>>>>>> > >>>>>>> Local APIC MSR Accesses > >>>>>>> http://msdn.microsoft.com/en-us/library/windows/hardware/ff542 > >>>>>>> 39 > >>>>>>> 6% > >>>>>>> 28v=vs.85%29.aspx > >>>>>>> > >>>>>>> Reference Time Counter > >>>>>>> http://msdn.microsoft.com/en-us/library/windows/hardware/ff542 > >>>>>>> 63 > >>>>>>> 7% > >>>>>>> 28v=vs.85%29.aspx > >>>>>>> > >>>>>>> We are going to add: Reference TSC Page > >>>>>>> http://msdn.microsoft.com/en-us/library/windows/hardware/ff542 > >>>>>>> 64 > >>>>>>> 3% > >>>>>>> 28v=vs.85%29.aspx > >>>>>>> > >>>>>>> Lazy EOI support, maybe more. > >>>>>>> > >>>>>> > >>>>>> Thanks for your update. More questions: I want to measure the > >>>>>> performance improvement with hyper-v features enabled. So I > >>>>>> want to > >>>>>> know: Are those features enabled by default in KVM? > >>>>> In KVM - yes, but you also need to specify them in QEMU command line. > >>>>> They can be enabled by -cpu features hv_vapic, hv_spinlocks, > >>>>> hv_time, and hv_relaxed > >>>> Hi Vadim, > >>>> in QEMU command line, how to enable these feature? > >>>> I try it with > >>>> 1. [root@vt-snb9 ]#qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 > >>>> -net none win8.1.img -cpu feature > >>>> hv_vapic,+hv_spinlocks,+hv_time,+hv_relaxed > >>>> qemu-system-x86_64: -cpu feature: drive with bus=0, unit=0 > >>>> (index=0) exists 2. [root@vt-snb9]# qemu-system-x86_64 > >>>> -enable-kvm -m 2048 -smp > >>>> 2 -net none win8.1.img -cpu > >>>> qemu64,+hv_vapic,+hv_spinlocks,+hv_time,+hv_relaxed > >>> > >>> something like this: -cpu qemu64, > >>> +x2apic,family=0xf,hv_vapic,hv_spinlocks=0xfff,hv_relaxed,hv_time > >>> > >>> (for hv_vapic we also need x2apic to be enabled) > >> > >> I saw the win8.1 guest boot up fail with error code 0x0000005c after > >> enabling > > hv_vapic on my ivy bridge-EP box. But it works well on my Sandy > > bridge-EP. Any thought? > >> > > What are the bug check parameters coming with > > HAL_INITIALIZATION_FAILED bug check? Is your guest 32 or 64-bit? How does it work with Win8? > > > Parameters: > 0x110, 0xffffffffffd11000, 0x19, 0xffffffffc0000001 > > Also saw this issue with Win8. > Thanks, I'll try to find Ivy Bridge-EP system and check why it doesn't work. Cheers, Vadim. > > > Thanks, > > Vadim. > > > >> > >>> > >>> Best regards, > >>> Vadim. > >>> > >>>> CPU feature hv_vapic not found > >>>> CPU feature hv_spinlocks not found CPU feature hv_time not found > >>>> CPU feature hv_relaxed not found CPU feature hv_vapic not found > >>>> CPU feature hv_spinlocks not found CPU feature hv_time not found > >>>> CPU feature hv_relaxed not found VNC server running on `::1:5900' > >>>> > >>>> > >>>>>> How to turn off/on it manually? > >>>>> Yes. From the QEMU command line. > >>>>> > >>>>>> And how can I know whether guest is using it really? > >>>>> There are two options - printk from the KVM side or WinDbg from > >>>>> the guest side. But in case of hv_time you can check the value > >>>>> returned by QueryPerformanceFrequency > >>>>> http://msdn.microsoft.com/en-us/library/windows/desktop/ms644905 > >>>>> % > >>>>> 28v=vs.85%29.aspx > >>>>> it should be 10MHz > >>>>> > >>>>>> Also, Do you have any performance data? > >>>>> http://www.linux-kvm.org/wiki/images/0/0a/2012-forum-kvm_hyperv. > >>>>> pd > >>>>> f > >>>>> pp 16, 18 > >>>>> I compared DPC and ISR times with xperf for two cases - with and > >>>>> without enlightenment. > >>>>> I also have seen reports mentioned around 5-10 percent CPU usage > >>>>> drop on the host side, when loading guest with some disk-stress tests. > >>>>> > >>>>>> > >>>>>>> Kind regards. > >>>>>>> Vadim. > >>>>>>> > >>>>>>>> > >>>>>>>> best regards > >>>>>>>> yang > >>>>>>>> > >>>>>>>> -- > >>>>>>>> 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 > >>>>>>> > >>>>>>> > >>>>>> > >>>>>> > >>>>>> Best regards, > >>>>>> Yang > >>>>>> > >>>>>> > >>>>> > >>>> > >>> > >> > >> > >> Best regards, > >> Yang > >> > >> > > > > > Best regards, > Yang > > -- 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
