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Re: [vfio-users] Far Cry Primal





On Mon, Jun 13, 2016 at 6:27 PM, Jayme Howard <g prime gmail com> wrote:
> That's the output for Doom.
>
> [1639445.044855] kvm [9487]: vcpu2 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR
> 0x1, nop
> [1639445.044861] kvm [9487]: vcpu2 ignored rdmsr: 0x1c9
> [1639445.044862] kvm [9487]: vcpu2 ignored rdmsr: 0x680
> [1639445.044863] kvm [9487]: vcpu2 ignored rdmsr: 0x6c0
> [1639445.044890] kvm [9487]: vcpu1 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR
> 0x1, nop
> [1639445.044895] kvm [9487]: vcpu1 ignored rdmsr: 0x1c9
> [1639445.044896] kvm [9487]: vcpu1 ignored rdmsr: 0x680
> [1639445.044897] kvm [9487]: vcpu1 ignored rdmsr: 0x6c0
> [1639445.044905] kvm [9487]: vcpu1 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR
> 0x1, nop
> [1639445.044907] kvm [9487]: vcpu1 ignored rdmsr: 0x1c9
> [1639445.044908] kvm [9487]: vcpu1 ignored rdmsr: 0x680
> [1639445.044909] kvm [9487]: vcpu1 ignored rdmsr: 0x6c0
> [1639445.046195] kvm [9487]: vcpu2 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR
> 0x1, nop
> [1639445.046198] kvm [9487]: vcpu2 ignored rdmsr: 0x1c9
> [1639445.046204] kvm [9487]: vcpu2 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR
> 0x1, nop
> [1639445.155114] kvm [9487]: vcpu0 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR
> 0x1, nop
> [1639445.155123] kvm [9487]: vcpu0 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR
> 0x1, nop
>

Odd, this is another game that is contantly reading the LBR. I initially thought this was part of the StarCraft 2 and Heroes of the Storm code. But now I think this might be part of Windows 10. Something being called by these games is causing a ton of LBR reads. Maybe DX 12?

I think if we can find what is causing these reads in the games we might be able to solve it. Because if this is the case we might be getting more and more games with performance problems because of these LBR checks.

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