2017-03-20 10:51 GMT+01:00 Harry Schmalzbauer <free...@omnilan.de>: > Bezüglich Vincenzo Maffione's Nachricht vom 18.03.2017 09:29 (localtime): > >… > >>> Actually, there is pending work on bhyve and netmap, that is going to > be > >>> merged soon, available at https://github.com/vmaffione/freebsd/ in > >>> branch ptnet-head. > >>> > >>> If you are interested, here there is some information > >>> https://wiki.freebsd.org/DevSummit/201609?action= > >> AttachFile&do=view&target=20160923-freebsd-summit-ptnet.pdf > >>> <https://wiki.freebsd.org/DevSummit/201609?action= > >> AttachFile&do=view&target=20160923-freebsd-summit-ptnet.pdf> > >>> together with bhyve cmdlines. > > Congratulations, nice work and presentation :-) >
Thanks! > > … > >> So I'm a bit lost regarding furhter decisions. My prefered if_lagg(4) > >> setup doesn't work with netmap at the moment, if_bridge(4) has > >> in-house-overhead and forces me to either drop jumbo frames completely > >> or use 9k MTU for any bridge member. > >> Will look into openvSwitch. Or better get some card providing VFs? > >> Or wait the ptnet merge and check if I can deploy my desired setup then? > >> And, I want to keep TSO and HWVLAN_TAG on the host interfaces… > >> > >> > > It depends on your requirements, in terms of connectivity between VMs and > > NICs and required performance (for a given workload, e.g. average > > packet-size, average packet rate, etc.). > > If you really want TSO an other offloadings on the phyisical NIC, then > you > > cannot use that NIC in netmap mode (e.g. attaching it to VALE). > > So to summarize for newbies exploring netmap(4) world in combination > with physical uplinks and virtual interfaces, it's important to do the > following uplink NIC configuration (ifconfig(8)): > -rxcsum -txcsum -rxcsum6 -txcsum6 -tso -lro promisc > Exactly. This is mentioned at the very end of netmap(4): "netmap does not use features such as checksum offloading, TCP segmentation offloading, encryption, VLAN encapsulation/decapsulation, etc. When using netmap to exchange packets with the host stack, make sure to disable these features." But it is probably a good idea to add these example ifconfig instructions somewhere (man page or at least the README in the netmap repo). > > I guess vlanhwtag, vlanhwfilter and vlanhwtso don't interfere, do they? > Well, I think they interfere: if you receive a tagged packet and the NIC strips the tag and puts it in the packet descriptor, then with netmap you will see the untagged packet, and you wouldn't have a way to see the tag. Cheers, Vincenzo > > Thanks, > > -harry > -- Vincenzo Maffione _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
