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? 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 > > -- 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
