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

Andrey Korolyov
2014-09-02T18:27:57Z

On Tue, Sep 2, 2014 at 10:11 PM, Amit Shah <amit.shah@redhat.com> wrote:
> 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

Sorry for thread hijacking, the problem definitely not related to the
interrupt rework, will start a new thread.