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

Jan Kiszka
2007-10-22T23:09:00Z

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Hi,

I'm seeing fairly high vm-exit latencies (300-400 us) during and only
during qemu/kvm startup and shutdown on a Core2 T5500 in 32-bit mode.
It's most probably while the VM runs inside bios code. During the rest
of the time, while some Linux guest is running, the exit latencies are
within microseconds, thus perfectly fine for the real-time scenarios I
have in mind.

Has anyone some idea what goes on there? As those hundreds of micros
precisely frame the assembly block in vmx_vcpu_run, I wonder what guest
code could cause such long delays. A quick glance at the bochs bios code
did not enlighten me yet.

Thanks,
Jan

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