Search this email forum. Gerd posted a script you can use with libvirt. It's in reply to my patch. On 13 Apr 2016 21:18, "thibaut noah" <[email protected]> wrote:
> The problem i have is i use libvirt, putting the flag on qemu-arg requires > to set cpu again. > As i have no idea which cpu setting will be used this doesn't seem like a > good idea, i saw that people use scripts apparently but i wonder if someone > figured out how to put this directly into libvirt > > 2016-04-13 20:37 GMT+02:00 Colin Godsey <[email protected]>: > >> Qemu 2.5+ supports the hv_vendor_id flag that lets you change the vendor >> ID. It was discovered that this is whats used by the nvidia drivers to >> detect hyper-v, so changing the vendor ID allows you to use all the >> enlightenments without upsetting nvidia >> >> On Tue, Apr 12, 2016 at 4:51 PM thibaut noah <[email protected]> >> wrote: >> >>> Hey guys, any news on that? More performances is always better, >>> wondering if there are been some changes recently since it is a few months >>> old >>> >>> 2015-12-05 18:04 GMT+01:00 Doug Applegate <[email protected]>: >>> >>>> Hi! >>>> >>>> I got excited after hearing that the latest Nvidia driver doesn't >>>> check Hyper-V. So I tried it on my Skylake Windows 10 VM using GTX970. >>>> Unfortunately it doesn't work for me using Fedora 23 and stock qemu. >>>> Windows reports the driver reports errors. >>>> >>>> I'm curious how you got it to work or where you read that it should. >>>> I'm using nvidia driver version 359.06 >>>> >>>> Thanks >>>> >>>> >>>> >>>> On Sat, Dec 5, 2015 at 4:21 AM, Eddie Yen <[email protected]> >>>> wrote: >>>> > >>>> > >>>> > 2015-12-05 19:02 GMT+08:00 Ruben Torrero Marijnissen >>>> > <[email protected]>: >>>> >> >>>> >> Hi, >>>> >> >>>> >> I installed last week a Windows 10 guest on my flaming new Skylake >>>> >> build, on top of my Arch Linux install. After doing some reading, I >>>> >> understood I had to disable any Hyper-V enlightment and make KVM run >>>> in >>>> >> 'hidden' mode, so my Nvidia drivers wouldn't shut down. >>>> >> >>>> >> However, just for the curiosity, I googled for a while and found the >>>> >> last version that didn't check for KVM presence and tested the >>>> >> different performance with and without Hyper-V enlightments: Oddly, >>>> >> Unigine benchmark doesn't show almost *any* performance gain, but >>>> with >>>> >> several games, the difference can be as big as 50% in heavily loaded >>>> >> scenarios. My guess on this games that rely more on the GPU won't see >>>> >> much improvements, but games that also use I/O and CPU extensively >>>> will >>>> >> see a big improvement. Any idea what other reasons there could be? >>>> > >>>> > >>>> > IME, if you didn't add any signs in -cpu tag, or if you deleted any >>>> Hvper-V >>>> > signs in VM XML file, it will disabled Hyper-V functions. >>>> > >>>> > And, there are many games will got unstable performance without >>>> Hyper-V, >>>> > especially online games and games that use a lot of mappings. >>>> > I got huge performance differences on 3DMark tests. With Hyper-V, I >>>> can got >>>> > about 103xx, BUT i got only 95xx when I disabled Hyper-V. >>>> > >>>> > If Hyper-V checker has removed since newest driver, it's a good news, >>>> but >>>> > still need to test it. >>>> > Also, some graphic cards only can use previous driver, especially >>>> using in >>>> > old OS. >>>> > >>>> >> >>>> >> I also read in a forum ( >>>> https://lime-technology.com/forum/index.php?top >>>> >> ic=43824.0) that Alex Williamson is working on a QEMU patch to allow >>>> >> Windows guests to use Hyper-V enlightments without Nvidia beeing able >>>> >> to detect is. Is this true?. Where could I follow the development / >>>> >> test it? >>>> > >>>> > >>>> > You can get that patch by downloading QEMU with git version. >>>> > >>>> > _______________________________________________ >>>> > vfio-users mailing list >>>> > [email protected] >>>> > https://www.redhat.com/mailman/listinfo/vfio-users >>>> > >>>> >>>> _______________________________________________ >>>> vfio-users mailing list >>>> [email protected] >>>> https://www.redhat.com/mailman/listinfo/vfio-users >>>> >>> >>> _______________________________________________ >>> vfio-users mailing list >>> [email protected] >>> https://www.redhat.com/mailman/listinfo/vfio-users >>> >> > > _______________________________________________ > vfio-users mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/vfio-users > >
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