On 12.09.2014 14:38, Stefan Hajnoczi wrote:
Max: Unrelated to this performance issue but I notice that the qcow2
metadata overlap check is high in the host CPU profile. Have you had
any thoughts about optimizing the check?
Stefan
In fact, I have done so (albeit only briefly). Instead of
On Fri, Sep 12, 2014 at 11:21:37AM +0800, Zhang Haoyu wrote:
If virtio-blk and virtio-serial share an IRQ, the guest operating
system has to check each virtqueue for activity. Maybe there is some
inefficiency doing that.
AFAIK virtio-serial registers 64 virtqueues (on 31 ports +
If virtio-blk and virtio-serial share an IRQ, the guest operating
system has to check each virtqueue for activity. Maybe there is some
inefficiency doing that.
AFAIK virtio-serial registers 64 virtqueues (on 31 ports + console)
even if everything is unused.
That could be the
On (Fri) 29 Aug 2014 [15:45:30], Zhang Haoyu wrote:
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
