On 2 December 2016 at 10:07, Radim Krčmář <rkrcmar@xxxxxxxxxx> wrote: > Subjects that touch only arch/x86/kvm/vmx.c are usually prefixed with > "[PATCH] KVM: VMX:". > > 2016-12-01 21:32-0500, Don Bowman: >> Add an enable_tsc_scaling parameter to kvm >> >> Signed-off-by: Don Bowman <db@xxxxxxxxxxxx> >> --- >> >> My system has what i thought were two identical processors (same >> stepping ID etc). >> However, bafflingly, one of them has the ability to do TSC scaling, >> and one does not (as reported in the vmcs). > > Wow, the chip doesn't sound trustworthy. Its TSC scaling. The tray-version doesn't have it, the retail one has it (2696 v3 vs 2699 v3). The TSC is reliable on both as are the other flags. As to why, I don't know. the stepping is identical. This happens if you have an OEM server w/ 1 socket, and then populate the other. I'm not sure Its a problem(?) ... > > You'll notice kvm_has_tsc_control in hardware_setup() when clearing the > flag if it isn't supported by hardware, so I think your change would > make sense as a x86 kvm module option based on kvm_has_tsc_control. > > Thanks. I will look @ this and supply new potential patch. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
