Hi Stephen, > -----Original Message----- > From: Stephen Hemminger [mailto:[email protected]] > Sent: Tuesday, November 21, 2017 3:13 PM > To: Hu, Jiayu <[email protected]> > Cc: [email protected]; [email protected]; Tan, Jianfeng > <[email protected]> > Subject: Re: [dpdk-dev] [PATCH] vhost: support UDP Fragmentation Offload > > On Tue, 21 Nov 2017 14:56:52 +0800 > Jiayu Hu <[email protected]> wrote: > > > In virtio, UDP Fragmentation Offload (UFO) includes two parts: host UFO > > and guest UFO. Guest UFO means the frontend can receive large UDP > packets, > > and host UFO means the backend can receive large UDP packets. This patch > > supports host UFO and guest UFO for vhost-user. > > > > Signed-off-by: Jiayu Hu <[email protected]> > > This may no longer be a desirable feature to implement. > UFO was just deprecated and removed from Linux. > It had no useful benefit.
The main reason of supporting UFO is to make the backend live migration from vhost-net to vhost-user possible. Host and guest UFO are default features for virtio-net, and vhost-net supports both. But vhosy-user doesn't support them. If we want to migrate from vhost-net to vhost-user, this features gap would cause live migration fail. Thanks, Jiayu
