On Fri, Sep 23, 2016 at 11:24:16AM -0700, Stephen Hemminger wrote: > On Fri, 23 Sep 2016 09:16:49 +0200 > Maxime Coquelin <maxime.coquelin at redhat.com> wrote: > > > Indirect descriptors are usually supported by virtio-net devices, > > allowing to dispatch a larger number of requests. > > > > When the virtio device sends a packet using indirect descriptors, > > only one slot is used in the ring, even for large packets. > > > > The main effect is to improve the 0% packet loss benchmark. > > A PVP benchmark using Moongen (64 bytes) on the TE, and testpmd > > (fwd io for host, macswap for VM) on DUT shows a +50% gain for > > zero loss. > > > > On the downside, micro-benchmark using testpmd txonly in VM and > > rxonly on host shows a loss between 1 and 4%.i But depending on > > the needs, feature can be disabled at VM boot time by passing > > indirect_desc=off argument to vhost-user device in Qemu. > > > > Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com> > > What about supporting VIRTIO_F_ANY_LAYOUT?
I thought it's already supported. That's required by virtio 1 and dpdk claims support for that. -- MST
