Re: [PATCH v3 0/4] Add vhost-user support to passt. (part 3)

[Stefano Brivio <sbrivio@redhat.com>]

On Thu, 22 Aug 2024 18:53:00 +0200
Stefano Brivio <sbrivio@redhat.com> wrote:

> On Wed, 21 Aug 2024 00:41:14 +0200
> Stefano Brivio <sbrivio@redhat.com> wrote:
> 
> > On Thu, 15 Aug 2024 17:50:19 +0200
> > Laurent Vivier <lvivier@redhat.com> wrote:
> >   
> > > This series of patches adds vhost-user support to passt
> > > and then allows passt to connect to QEMU network backend using
> > > virtqueue rather than a socket.
> > > 
> > > With QEMU, rather than using to connect:
> > > 
> > >   -netdev stream,id=s,server=off,addr.type=unix,addr.path=/tmp/passt_1.socket
> > > 
> > > we will use:
> > > 
> > >   -chardev socket,id=chr0,path=/tmp/passt_1.socket
> > >   -netdev vhost-user,id=netdev0,chardev=chr0
> > >   -device virtio-net,netdev=netdev0
> > >   -object memory-backend-memfd,id=memfd0,share=on,size=$RAMSIZE
> > >   -numa node,memdev=memfd0
> > > 
> > > The memory backend is needed to share data between passt and QEMU.
> > > 
> > > Performance comparison between "-netdev stream" and "-netdev vhost-user":    
> > 
> > By the way, I attached a quick patch adding vhost-user-based tests to
> > the usual throughput and latency tests.
> > 
> > UDP doesn't work (I didn't look into that at all), TCP does.  
> 
> Complete/fixed patch attached. The only part of UDP that's not working
> is actually over IPv6 -- it works over IPv4.

...guest to host, that is. The other direction works.

-- 
Stefano