<div dir="ltr">I'm using GTX480 & GTX980 for now. GTX480 used by host and another one used by guest.<div>GTX980 works very well in guest, tested 3 major games (Assassin's Creed: Unity, Crysis 3, and GTA5), and all works well.</div><div>The only problem is that I need to add KVM Hidden State=on and qemu:commandline to adding Hyper-V specs.</div><div> </div><div>QEMU will support Hyper-V that override NVIDIA driver detection, but I don't know how long will support on libvirt and virt-manager.</div></div><div class="gmail_extra"> <div class="gmail_quote">2015-10-30 22:13 GMT+08:00 Ryan Flagler <<a href="mailto:ryan.flagler@gmail.com" target="_blank">ryan.flagler@gmail.com</a>>: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Thanks for the config examples. What GPU's do you guys use? I'm struggling with 2 different AMD Radeon models (7850 and R9 380). Early on in my research I noticed people saying Radeons were easier to get working, but the deeper I dig, it seems nVidia cards have some initial quirks, but are more stable. Hopefully next week I'll get some time to tweak my setup more.</div><div class="HOEnZb"><div class="h5"> <div class="gmail_quote"><div dir="ltr">On Thu, Oct 29, 2015 at 11:15 PM Dan Ziemba <<a href="mailto:zman0900@gmail.com" target="_blank">zman0900@gmail.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I'll also throw in the scripting I used to use before switching to libvirt a month or so back. The latest version is with the default i440 machine, but if you look back in the history some you can see how I was using q35 before. <a href="https://github.com/zman0900/qemu-vifo" rel="noreferrer" target="_blank">https://github.com/zman0900/qemu-vifo</a> -----Original Message----- From: Mark Weiman <<a href="mailto:mark.weiman@markzz.com" target="_blank">mark.weiman@markzz.com</a>> To: Ryan Flagler <<a href="mailto:ryan.flagler@gmail.com" target="_blank">ryan.flagler@gmail.com</a>>, <a href="mailto:vfio-users@redhat.com" target="_blank">vfio-users@redhat.com</a> Subject: Re: [vfio-users] KVM options and the effect on performance Date: Fri, 30 Oct 2015 00:00:21 -0400 To be honest, I have found little to no real noticeable difference between many of them. My VMs usually use a qcow2 image that are mounted via virtio. As for a CPU, I use an i7-4970K and it works beautifully. It really boils down to when you choose your hardware whether or not you've done the research beforehand so you can have a good time rather than fighting it. If I were to build my main rig again, I would have looked closer into the motherboard so I wouldn't have to patch my kernel, although it really is not a problem to do with that CPU (I also provide a slightly modified version of Dan Ziemba's PKGBUILD [1] that includes the i915 and acs patch from my Arch Linux repository [2]). As for your Wiki idea, since this all is open source software, there is nothing preventing you from contributing to documentation on this. The Arch Linux Wiki does provide a lot of information on how to do all of this [3] and can guide you even if you aren't using Arch Linux. Just change the Arch specific bits to whatever distribution you use. If it helps, this is the script I use when I run my Windows 10 VM [4]. It's really sloppy, but it seems to work for me. As for using btrfs to store images, I use it to store my images and I have had no issue. It just has to be pointed out that btrfs is still under development, so you should just put that under consideration. Didn't want to leave ya hangin, Mark Weiman [1] <a href="https://aur.archlinux.org/packages/linux-vfio-lts" rel="noreferrer" target="_blank">https://aur.archlinux.org/packages/linux-vfio-lts</a> [2] <a href="https://wiki.archlinux.org/index.php/Unofficial_user_repositories#m" rel="noreferrer" target="_blank">https://wiki.archlinux.org/index.php/Unofficial_user_repositories#m</a> arkzz [3] <a href="https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF" rel="noreferrer" target="_blank">https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF</a> [4] <a href="http://info.markzz.com/kvm-start.sh" rel="noreferrer" target="_blank">http://info.markzz.com/kvm-start.sh</a> On Thu, 2015-10-29 at 16:50 +0000, Ryan Flagler wrote: > Hey everyone, sorry if I'm doing this wrong, this is my first time > using a mailing list. (Side note, if anyone has a better way to view > historical emails than the web page, please let me know) > > I've been tinkering with KVM for a bit on my system and had some > general performance questions to ask. I see a lot of people doing VGA > passthrough using the q35 chipset instead of the i440FX chipset. I've > personally had no luck getting q35 to be stable for me, and I've seen > some people say it's not worth the headache. But the big question to > me, is there a performance difference with CPU, VGA, memory etc. > using q35? I'm not looking for specifics, but I'm curious about the > following qemu parameters. > > Which chipset emulation performs better and in what areas? > q35 vs i440fx > > What is the best way to pass a disk through to a VM to get the most > performance? > .img file, /dev/sd[x] disk, virtio-scsi, etc. > > What is the best way to handle networking? > virtio-nic, hardware passthrough, bridge, nat, etc. > > What is the best way to assign CPUs? > cpu pinning, assigning host cpu parameters, etc. > > Does the BIOS have an effect on performance? > seabios vs OVMF? > > CPU/Chipset IOMMU support - Not necessarily performance related, but > stability? > e5 vs e3 vs i7 vs cpu architecture etc. What things are good to look > for, what are bad? Etc. > > What would be interesting, especially as a new KVM/Qemu user, would > be to see an entire wiki/performance page with examples and > specifics. It's hard to filter through all the various pages of VM > options where people don't really explain why they're doing something > the way they are. > > Examples: > > Disk Options > Best > -device virtio-scsi-pci,id=scsi > -drive file=/dev/sd[x],id=disk,format=ls raw,if=none -device scsi- > hd,drive=disk > > Better > -device virtio-scsi-pci,id=scsi > -drive file=/opt/[vm_name].img,id=disk,format=raw -device scsi- > hd,drive=disk > > Good > -drive file=/opt/[vm_name].img,id=disk,format=raw -device ide- > hd,bus=ide.0,drive=disk > > And maybe an overall explanation of why one is better over the other. > I know this may not exist and I'm not asking a single person to do > the leg work, but being new to this, it's hard to focus on the pieces > that matter vs just using the first thing I find that works. If there > is a "right" place to start something like this I'd be happy to setup > a generic page where more experienced people could easily contribute. > > Thanks - Ryan > > > _______________________________________________ > vfio-users mailing list > <a href="mailto:vfio-users@redhat.com" target="_blank">vfio-users@redhat.com</a> _______________________________________________ vfio-users mailing list <a href="mailto:vfio-users@redhat.com" target="_blank">vfio-users@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/vfio-users" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/vfio-users</a></blockquote></div> </div></div> _______________________________________________ vfio-users mailing list <a href="mailto:vfio-users@redhat.com">vfio-users@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/vfio-users" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/vfio-users</a> </blockquote></div> </div>