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 >> >
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