Still the same with 4.5-rc4 and AUR qemu-git. On 23 Jan 2016, at 18:55, Dan Ziemba wrote:
> On Tue, 2016-01-19 at 16:52 +0100, Friedrich Oslage wrote: >> I did some more testing and it turns out to be a kernel error, >> introduced somewhere around linux 4.3. >> >> Short description of the error: 100% cpu usage while using 3d in a vm >> with vfio >> >> My last known good kernel is 4.2.8, which gives me about 20% cpu >> usage >> while playing Diablo III. My first known bad kernel is 4.3.3, which >> gives me 100% cpu usage with every game, even while idle-ling in the >> menu. >> >> On 01/17/2016 10:29 AM, Friedrich Oslage wrote: >>> my host system is linux-4.4.0 with qemu-2.5.0 and a 4-core i7. >>> Linux is >>> booted with isolcpus=1-3,5-7 to reserve 3 cores + threads for the >>> Windows 10 VM. >>> The VM's 3 cores(2 threads each) are pinned to the respective >>> physical >>> core/thread. The iothread is pinned to 1-3,5-7. > > Interesting, I've also noticed similar behavior since upgrading to > kernel 4.4 and qemu 2.5.0. I am running 4 cores / 8 threads for the VM > and pinned to individual host threads by libvirt, but I didn't boot > with the isolcpus arg. Emulator threads are pinned to the remaining 4 > host threads. > > Host is a i7-5930K, so 6 cores. Guest is running Win 8.1. > > Just sitting at the pause screen in Fallout: New Vegas, I have a single > CPU running at 100% according to both the windows task manager and the > host. The host cpu thread that is at 100% is one of the ones with a > vcpu pinned to it. In the guest, it does appear that the game is the > thing using all the CPU cycles, and the GPU is basically idle at this > time. > > When I was previously running kernel 4.1.15 and qemu 2.4, New Vegas was > never demanding enough to max out any one cpu no matter what I was > doing with the game. Same goes for more demanding games such as GTA V. > > > I upgraded both kernel and qemu at the same time, so I can't say which > caused it. I haven't really noticed much difference in performance. If > anything, it might be slightly better. I seemed to notice less frame > rate drops and stuttering while playing GTA V after the upgrade. > > Dan > > _______________________________________________ > vfio-users mailing list > vfio-users@redhat.com > https://www.redhat.com/mailman/listinfo/vfio-users _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
