On (Tue) 02 Sep 2014 [22:05:45], Andrey Korolyov wrote:
> Can confirm serious degradation comparing to the 1.1 with regular
> serial output - I am able to hang VM forever after some tens of
> seconds after continuously printing dmest to the ttyS0. VM just ate
> all available CPU quota during test and hanged over some tens of
> seconds, not even responding to regular pings and progressively
> raising CPU consumption up to the limit.
Entirely different to what's being discussed here. You're observing
slowdown with ttyS0 in the guest -- the isa-serial device. This
thread is discussing virtio-blk and virtio-serial.
Amit
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