Re: disappointing speed with virtio_blk

[Gerd von Egidy <lists@egidy.de>]

Hi Charles,

thanks for the quick reply.

> My understanding is that virtio is very latency-sensitive. Do you know
> whether your system is configured for high-resolution timer support, and
> (more to the point) which clock source KVM is using on your host?

On the host:
> grep "Clock Event Device" /proc/timer_list
Clock Event Device: hpet
Clock Event Device: lapic
Clock Event Device: lapic

Within the vm:
> grep "Clock Event Device" /proc/timer_list
Clock Event Device: pit
Clock Event Device: lapic

Host and vm use the same kernel, CONFIG_HIGH_RES_TIMERS=y

How do I find out which clock source KVM is using?

Kind regards,

Gerd

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