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Does enabling client hyper-v reduce the hosts gaming performance?

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    All work and no play.. is no good. So my question is this: When I enable the client hyper-v, does that mean that the "host" Windows 8 system really is a virtual guest of the hypervisor? And if so, what does that do for game performance, for instance does that mean no support for Direct X11?

    Regards

    Ola

    Thursday, October 11, 2012 7:53 PM
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    Yes, it is a VM, the parent partition. 

    Because of the hardware requirements for Hyper-V in Windows 8 (EPT/RVI) there is should be minimal effect on performance.  DirectX will work.  The parent partition is treated differently than other VMs.  In the parent partition you have more direct access to the video card vs. a VM which needs to use RemoteFX for video acceleration.

    This post by Ben gives an explanation, it's for Windows 2008 R2, but that was where the inital changes in the Hyper-V parent partition were introduced: http://blogs.msdn.com/b/virtual_pc_guy/archive/2011/01/17/using-hyper-v-for-a-high-end-desktop-computer.aspx


    • Marked as answer by Ola P Friday, October 12, 2012 9:32 AM
    • Edited by essjae Monday, March 4, 2013 7:05 PM clarification
    Thursday, October 11, 2012 10:08 PM
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    Yes, it is a VM, the parent partition. 

    Because of the hardware requirements for Hyper-V in Windows 8 (EPT/RVI) there is should be minimal effect on performance.  DirectX will work.  The parent partition is treated differently than other VMs.  In the parent partition you have more direct access to the video card vs. a VM which needs to use RemoteFX for video acceleration.

    This post by Ben gives an explanation, it's for Windows 2008 R2, but that was where the inital changes in the Hyper-V parent partition were introduced: http://blogs.msdn.com/b/virtual_pc_guy/archive/2011/01/17/using-hyper-v-for-a-high-end-desktop-computer.aspx


    • Marked as answer by Ola P Friday, October 12, 2012 9:32 AM
    • Edited by essjae Monday, March 4, 2013 7:05 PM clarification
    Thursday, October 11, 2012 10:08 PM
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    Playing dota 2:

    hyper-v enabled: 30-40 fps

    hyper-v disabled: 70-80 fps

    I don't really think this is a minimal effect on performance...

    All the VMs were 'saved' which means off the cpu and ram, yet, hyper-v seems to degrade the cpu no matter what, original performances can be restored only by turning off the hyper-v feature completely from windows.

    Windows 8 Pro x64

    • Edited by thnts Wednesday, November 21, 2012 11:37 AM
    • Proposed as answer by ZLHysong Monday, November 4, 2013 2:50 PM
    Wednesday, November 21, 2012 8:50 AM
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    Hello,

    Personally I have seen no difference with Hyper-v enabled or not (with a virtual machine running because I had forgotten to shut it down before launching a game (NWN2).

    The CPU is a core i7 and a z77 chipset and a GPU AMD 4850.

    Marc

    Thursday, November 29, 2012 7:14 AM
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    o.k. and what about the start time start to ability to use internet? How much time costed to start using external and internal switch? Seems to me that host is starting significantly  slowlier, after hyper v enabled..

    Jiri Cvrk


    • Edited by JiriCvrk Friday, November 30, 2012 5:41 PM
    Friday, November 30, 2012 5:33 PM
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    Hello,

    Personally I didn't see any difference with the ping time. when I click on a link in internet it is running directly... For the host starting, I have a SSD and I didn't see any difference. The only problem I have is the jumbo frames not working but is is not related to Hyper-v as even without Hyper-v it is not running but in a dual boot with Win7 it is working.

    Monday, December 3, 2012 5:52 AM
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    I can confirm the post of 'thnts', the framerate doubled after disabling Hyper-V. It is probably not visible with every game. But I can say, that with Assassin's Creed III the framerate doubled after deactivating Hyper-V. From unplayable 15-20 frames per second to about 30-50 frames per second.

    Every virtual machine was shut down. Only deactivating Hyper-V completely helped. Virtualization feature of CPU is activated in BIOS.

    So I can say yes to the question. Having Hyper-V enabled has an impact on playing games.

    Kind Regards

    Tuesday, December 4, 2012 12:00 PM
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    Can you post your video card make and model as well as driver version?

    I think this is something that will improve as video drivers mature.

    Tuesday, December 4, 2012 7:14 PM
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    Hello,

    my video card is an AMD/ATI Radeon HD 5770. I've tried several drivers. First one was Catalyst 12.10. Followed by 12.11 Beta8 and 12.11 Beta11. As far as I can tell there was no performance gain with anyone of them.

    Kind regards

    Wednesday, December 5, 2012 1:14 AM
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    I had to enable Hyper-V to run the Windows Phone 8 emulator, but when I'm not working on my app, im playing games, and it is a very noticeable difference in performance. But I have to live with it because I don't feel like disabling hyper-v every time I feel like firing up my favorite game. It sure is a problem.
    Thursday, December 20, 2012 11:59 PM
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    Hello,

    I can confirm the same issues with different games (DirectX 11).

    Hyper-V deactivated: framerate 40fps;
    Hyper-V active: framerate 10fps and it's not playable anymore.

    My video card is an ATI Radeon HD 5870
    Driver Version 12.11

    Sunday, December 30, 2012 6:42 PM
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    Good Evening,

    same problem with AMD 7970 and Driver 13.1.

    Game: World of Tanks

    Greetings Michael

    Monday, February 18, 2013 12:48 PM
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    Does anyone have an nVidia card they could swap with the AMD to see if that makes a difference?
    Monday, March 4, 2013 7:06 PM
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    It doesn't matter on my set up.  GTX560TI or AMD 7950, if I watch my GPU while gaming and I uninstall Hyper-V it will hit 99% utilization.  If Hyper-V is installed it rarely pushes past 60%.

    The only solution I know is to uninstall Hyper-V.  My problem is I game daily, and user Hyper-V a few times a month.

    Is their services I can disable.. or is there a system wide setting I need to toggle to turn it back into a regular machine on the host.

    I'm not sure.

    Sunday, March 24, 2013 7:22 AM
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    Yes, it's noticeably difference in performance. In BF3 about 20-30 FPS. Any idea how to fix it?

    Is it possible to disable Hypervisor without Windows (win 8) restart?

    Kind Regards.

    Sunday, March 31, 2013 2:32 PM
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    >Is it possible to disable Hypervisor without Windows (win 8) restart?
     
    There's just no way to do that live, the OS is running on top of the
    hypervisor, so you cannot just yank the hypervisor without a reboot.
     
     
    Bob Comer - Microsoft MVP Virtual Machine
    Sunday, March 31, 2013 3:04 PM
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    This is what I do now.. when I'm not going to use hyper-v on Windows 8:

    #1) Stop all my Virtual Machines and close Hyper-V

    #2)  Set the "Hyper-V Virtual Machine Management" service to disabled

    #3) Open an elevated cmd prompt and type: "bcdedit /set hypervisorlaunchtype off"

    #4) Restart

    #5) Open up AMD Overdrive, check your GPU utilization.. Launch Crysis 3.. now Im using 88% of my GPU again

    If you need to use Hyper-V again just turn the hypervisor launch type back and restart.. better than uninstalling.

    Friday, May 10, 2013 10:52 AM
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    If I wanted to run VMs on my gaming PC, would I be better off using VirtualBox instead of Hyper-V then?  This way I don't have to run the host on a Hypervisor.  Would the only negative be slower VM performance?

    I plan on creating and deleting VMs for testing and educational purposes so VM performance is not priority.  Since I paid a lot of money on hardware, I want to be able to use them to their fullest potential (for gaming or otherwise).


    • Edited by Guy Techie Wednesday, August 13, 2014 3:35 PM
    Wednesday, August 13, 2014 3:34 PM
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    VM performance under VirtualBox wont be all that much slower and video will probably be faster.  You also gain USB access.

    What you lose by not using Hyper-V is not being able to create and run VM's meant for Hyper-V on a server, which in your case it sounds like it's not necessary.  Network and disk access may be faster under Hyper-V in some situations, but I doubt if it will be enough to matter.

    I run VMWare WS on my PC at home most of the time and it works out well.  I do have it set up to dual boot with Hyper-V, but I rarely use it there.  (I use Hyper-V at work though...)

    Bob Comer

    Wednesday, August 13, 2014 4:01 PM
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    Thanks for the response.

    If I recall, VirtualBox can use VHD (not sure about VMWare).  You may be able to boot off a VHD created by Hyper-V.  The HAL may be different, but you can either allow the guest OS to reinstall the drivers in the new environment or sysprep /generalize the OS in Hyper-V before using it on VirtualBox, right?  (Or vice versa - VHD from VirtualBox to a Hyper-V VM).

    • Edited by Guy Techie Wednesday, August 13, 2014 4:41 PM
    Wednesday, August 13, 2014 4:39 PM
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    Ehhh, yes and no.  Doable, but not just a drop in, and not easily reversed with the same problems.  It's not just a run in one and then run in the other and then back, it'll take repairs going either way.

    I would never really suggest it.  Unless I have a very specific reason to move a VM to another platform, I build new VM's on the new platform instead.  And I might use a backup/hardware agnostic restore product to do the move.

    Bob Comer

    Wednesday, August 13, 2014 5:20 PM
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