[dpdk-dev] [PATCH v2] add mtu set in virtio

[Maxime Coquelin]

Hi Souvik,

On 08/30/2016 01:02 AM, souvikdey33 wrote:
> Signed-off-by: Souvik Dey <sodey at sonusnet.com>
>
> Fixes: 1fb8e8896ca8 ("Signed-off-by: Souvik Dey <sodey at sonusnet.com>")
> Reviewed-by: Stephen Hemminger <stephen at networkplumber.org>
>
> Virtio interfaces should also support setting of mtu, as in case of cloud
> it is expected to have the consistent mtu across the infrastructure that
> the dhcp server sends and not hardcoded to 1500(default).
> ---
>  drivers/net/virtio/virtio_ethdev.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)

FYI, there are some on-going changes in the VIRTIO specification
so that the VHOST interface exposes its MTU to its VIRTIO peer.
It may also be used as an alternative of what you patch achieves.

I am working on its implementation in Qemu/DPDK, our goal being to
reduce performance drops for small packets with Rx mergeable buffers
feature enabled.

Regards,
Maxime