On 4/1/20 11:29 PM, Marvin Liu wrote:
> Defer shadow ring update will help overall throughput when frontend
> much slower than backend. But that is not all the cases we faced now.
> In case like ovs-dpdk + dpdk virtio user, frontend will much faster
> than backend. Frontend may not be able to collect available descs when
> shadow update is deferred. Thus will harm RFC2544 performance.
I don't understand this comment. What is the difference in term of
performance between Qemu + Virtio PMD and Virtio-User PMD, as the
datapath is the same?
> Solution is just remove deferred shadow update, which will help RFC2544
> and fix potential issue with virtio net driver.
What is the potential issue?
Maxime
