Re: [question] virtio-blk performance degradationhappened with virito-serial

Amit Shah
2014-09-02T18:11:13Z

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