Re: High vm-exit latencies during kvm boot-up/shutdown

[Jan Kiszka <jan.kiszka-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>]

Jan Kiszka wrote:
> Avi Kivity wrote:
>> Seeing vmx_vcpu_run() in there confuses me, as it always runs with
>> interrupts disabled (it does dispatch NMIs, so we could be seeing an NMI).
> 
> The point is that the cyclictest does not find large latencies when kvm
> is not happening to start or stop right now. And if you are thinking
> about NMIs triggered by the kvm code on vm-exit: I also instrumented
> that code path, and it is not taken in case of the long delay.

Actually, that instrumentation was for an older version. In this one
here, the vm-entry/exit block is clearly framed by traced vmcs_xxx calls.

Jan

-- 
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux

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