> 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 :)
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