On Mon, 09/22 21:23, Zhang Haoyu wrote:
> >
> >Amit,
> >
> >It's related to the big number of ioeventfds used in virtio-serial-pci. With
> >virtio-serial-pci's ioeventfd=off, the performance is not affected no matter
> >if
> >guest initializes it or not.
> >
> >In my test, there are 12 fds to poll
>> > >>> Hi, all
>> > >>>
>> > >>> I start a VM with virtio-serial (default ports number: 31), and found
>> > >>> that virtio-blk performance degradation happened, about 25%, this
>> > >>> problem can be reproduced 100%.
>> > >>> without virtio-serial:
>> > >>> 4k-read-random 1186 IOPS
>> > >>>
>> >>> Hi, all
>> >>>
>> >>> I start a VM with virtio-serial (default ports number: 31), and found
>> >>> that virtio-blk performance degradation happened, about 25%, this
>> >>> problem can be reproduced 100%.
>> >>> without virtio-serial:
>> >>> 4k-read-random 1186 IOPS
>> >>> with virtio-seri
>> >> Hi, all
>> >>
>> >> I start a VM with virtio-serial (default ports number: 31), and found
>> >> that virtio-blk performance degradation happened, about 25%, this problem
>> >> can be reproduced 100%.
>> >> without virtio-serial:
>> >> 4k-read-random 1186 IOPS
>> >> with virtio-serial:
>> >
