[RFC v5 0/5] virtio: support packed ring

Jason Wang
Fri, 25 May 2018 02:31:26 -0000

On 2018?05?22? 16:16, Tiwei Bie wrote:
> Hello everyone,
>
> This RFC implements packed ring support in virtio driver.
>
> Some simple functional tests have been done with Jason's
> packed ring implementation in vhost (RFC v4):
>
> https://lkml.org/lkml/2018/5/16/501
>
> Both of ping and netperf worked as expected w/ EVENT_IDX
> disabled. Ping worked as expected w/ EVENT_IDX enabled,
> but netperf didn't (A hack has been added in the driver
> to make netperf test pass in this case. The hack can be
> found by `grep -rw XXX` in the code).

Looks like this is because a bug in vhost which wrongly track
signalled_used and may miss an interrupt. After fixing that, both side
works like a charm.

I'm testing vIOMMU and zerocopy, and will post a new version shortly.
(Hope it would be the last RFC version).

Thanks