On Fri, 21 Sep 2018 23:01:12 +0200 Damjan Marion <dmar...@me.com> wrote:
> > On 21 Sep 2018, at 20:27, Stephen Hemminger <step...@networkplumber.org> > > wrote: > > > > On Thu, 20 Sep 2018 21:04:17 +0200 > > Damjan Marion <dmar...@me.com <mailto:dmar...@me.com>> wrote: > > > >>> On 20 Sep 2018, at 20:27, Stephen Hemminger <step...@networkplumber.org> > >>> wrote: > >>> > >>> Is there a way to use virtio_user as an exception path with DPDK? > >>> > >>> https://doc.dpdk.org/guides-17.11/howto/virtio_user_as_exceptional_path.html > >>> > >>> Testing simple case, I see much better performance with this when > >>> forwarding > >>> a 10G device to kernel. > >>> > >>> Rx Tx > >>> KNI 3.2 Gbit/sec 1.3 Gbit/sec > >>> TAP 4.9 4.7 > >>> Virtio 5.6 8.6 > >>> > >>> Maybe a VPP plugin is needed. > >> > >> Isn't that what we have in our new TAP code? TAP with vhost-net backend? > >> > >> https://git.fd.io/vpp/tree/src/vnet/devices/tap/tap.c > >> <https://git.fd.io/vpp/tree/src/vnet/devices/tap/tap.c> > >> <https://git.fd.io/vpp/tree/src/vnet/devices/tap/tap.c > >> <https://git.fd.io/vpp/tree/src/vnet/devices/tap/tap.c>> > > > > The performance for simple passthrough/bridge of 10 Gig NIC into TAP seems > > to be quite slow with VPP and has lots of bufferbloat. > > > > See attached rrul test results: > > Down Up Latency > > DPDK TAP 550 Mbit/sec 700 Mbit/sec 3.5ms > > DPDK virtio_user 800 800 2.5 > > VPP TAP 50 1000 10 > > > > Hard to comment as no much date about your config. I never looked into dpdk > code, might be that they do something very special :) > > You can also refer to this paper for more details: https://dl.acm.org/citation.cfm?id=3098586 You can get a virtio_user device in VPP, via dpdk vdev but it doesn't seem to work the same as tap. L2 bridge isn't working as expected. Maybe promiscuous doesn't work. dpdk { socket-mem 1024,0 vdev virtio_user0,path=/dev/vhost-net,queue_size=1024 } vpp# show int Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count GigabitEthernet8/0/0 2 down 9000/0/0/0 TenGigabitEthernet4/0/0 1 down 9000/0/0/0 VirtioUser0/0/0 3 down 9000/0/0/0 local0 0 down 0/0/0/0
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#10605): https://lists.fd.io/g/vpp-dev/message/10605 Mute This Topic: https://lists.fd.io/mt/25834626/21656 Group Owner: vpp-dev+ow...@lists.fd.io Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
