Need your vm configs to see if there's anything wrong On Jan 29, 2017 4:29 AM, "R" <[email protected]> wrote:
> First time doing this mailing list thing, hopefully I'm doing it right. > > Either way, myself and an acquaintance are both using GPU pass-through > methods to do a bit of gaming on our Linux machines, both running Arch with > qemu-KVM with a Win10 guest. We've both come across an issue with a > particular CPU, namely AMD's FX-8320. The best way to describe it would be > the "rubber banding" experienced in online gaming. We both get mostly > stable fps, however we both experience this odd effect. The best way it can > be described would be as if something hangs up, then suddenly lets go, > causing the game to rush forward to where it should be. It's very much like > latency in an online match when it suddenly spikes and you see other > players rush to where they actually are, only offline and in any game. > > The current theory has to do with the 8320's FPUs and how they interact > with CPU pinning, but I think it's more some kind of I/O issue. At least, > it seems like there's a *bottleneck *somewhere in the system or virtual > environment causing this any time data is requested. By what? I don't know. > Said acquaintance is a bit more experienced in this than I am and has tried > various methods (I don't know the extent) with IRQ nonsenses, where I think > it may lie to some degree. I simply have the drunken charisma and way with > words to bring our problem to light. > > Either way, it's incredibly annoying. We keep two CPUs for the host, the > other six are pinned to the VM for whatever it needs though it seems that > the less cores you apply to the guest, the less the effect is noticed. Most > everything that can be run on virtio is, and hugepages make no difference. > What's more, acquaintance is running a 970 chipset and I'm running a 990FX. > Both our boards properly support this venture. As a clutch, I made sure > some of the basics with virtio is run with MSI enabled and used, but I've > only been at this a week. Thus, I'm asking for experts in the field to help > out. > > I've got this far in this, I'd hate to hear it's just the nature of the > AMD beast and have to chalk it up to time mostly well sepent. If it is > indeed an FPU issue with the CPU, it makes no sense to me that it'd only > appear in a virtual environment and not on metal. > > > > _______________________________________________ > vfio-users mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/vfio-users > >
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