aleksandr.fedorov_itglobal.com created this revision. aleksandr.fedorov_itglobal.com added reviewers: bryanv, hrs, network. Herald added a subscriber: ae.
REVISION SUMMARY It seems, there are no reason to prevent setting MTU more than 1500 bytes. MTU greater than 1500 gives a significant increase in throughput. TEST PLAN iperf3 tests between two machines using vxlan over 10Gbit network with various MTU. **Test 1. vxlan MTU -1500, physical network MTU - 9000** # iperf3 -c 192.168.248.1 Connecting to host 192.168.248.1, port 5201 [ 5] local 192.168.248.2 port 1050 connected to 192.168.248.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 175 MBytes 1.46 Gbits/sec 0 1.27 MBytes [ 5] 1.00-2.01 sec 194 MBytes 1.63 Gbits/sec 0 1.27 MBytes [ 5] 2.01-3.00 sec 195 MBytes 1.64 Gbits/sec 0 1.27 MBytes [ 5] 3.00-4.01 sec 196 MBytes 1.64 Gbits/sec 0 1.27 MBytes [ 5] 4.01-5.00 sec 195 MBytes 1.64 Gbits/sec 0 1.27 MBytes [ 5] 5.00-6.00 sec 195 MBytes 1.63 Gbits/sec 0 1.27 MBytes [ 5] 6.00-7.00 sec 196 MBytes 1.64 Gbits/sec 0 1.27 MBytes [ 5] 7.00-8.00 sec 194 MBytes 1.64 Gbits/sec 0 1.27 MBytes [ 5] 8.00-9.00 sec 191 MBytes 1.60 Gbits/sec 493 968 KBytes [ 5] 9.00-10.00 sec 193 MBytes 1.62 Gbits/sec 0 1.15 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 1.88 GBytes 1.61 Gbits/sec 493 sender [ 5] 0.00-10.00 sec 1.88 GBytes 1.61 Gbits/sec receiver iperf Done. **Test 2. vxlan MTU -8900, physical network MTU - 9000** # iperf3 -c 192.168.248.1 Connecting to host 192.168.248.1, port 5201 [ 5] local 192.168.248.2 port 1052 connected to 192.168.248.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 585 MBytes 4.90 Gbits/sec 0 1.28 MBytes [ 5] 1.00-2.00 sec 655 MBytes 5.50 Gbits/sec 0 1.28 MBytes [ 5] 2.00-3.00 sec 656 MBytes 5.50 Gbits/sec 0 1.28 MBytes [ 5] 3.00-4.00 sec 655 MBytes 5.50 Gbits/sec 0 1.28 MBytes [ 5] 4.00-5.00 sec 656 MBytes 5.50 Gbits/sec 0 1.28 MBytes [ 5] 5.00-6.00 sec 655 MBytes 5.50 Gbits/sec 0 1.28 MBytes [ 5] 6.00-7.00 sec 656 MBytes 5.50 Gbits/sec 0 1.28 MBytes [ 5] 7.00-8.00 sec 658 MBytes 5.51 Gbits/sec 0 1.28 MBytes [ 5] 8.00-9.00 sec 655 MBytes 5.50 Gbits/sec 0 1.28 MBytes [ 5] 9.00-10.00 sec 655 MBytes 5.50 Gbits/sec 0 1.28 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 6.33 GBytes 5.44 Gbits/sec 0 sender [ 5] 0.00-10.00 sec 6.33 GBytes 5.44 Gbits/sec receiver iperf Done. **Test 3. vxlan MTU -8900, physical network MTU - 1500** # iperf3 -c 192.168.248.1 Connecting to host 192.168.248.1, port 5201 [ 5] local 192.168.248.2 port 1055 connected to 192.168.248.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 301 MBytes 2.52 Gbits/sec 0 1.28 MBytes [ 5] 1.00-2.00 sec 335 MBytes 2.81 Gbits/sec 0 1.28 MBytes [ 5] 2.00-3.00 sec 336 MBytes 2.82 Gbits/sec 0 1.28 MBytes [ 5] 3.00-4.00 sec 336 MBytes 2.82 Gbits/sec 0 1.28 MBytes [ 5] 4.00-5.00 sec 335 MBytes 2.81 Gbits/sec 0 1.28 MBytes [ 5] 5.00-6.00 sec 336 MBytes 2.82 Gbits/sec 0 1.28 MBytes [ 5] 6.00-7.00 sec 336 MBytes 2.82 Gbits/sec 0 1.28 MBytes [ 5] 7.00-8.00 sec 335 MBytes 2.81 Gbits/sec 0 1.28 MBytes [ 5] 8.00-9.00 sec 336 MBytes 2.82 Gbits/sec 0 1.28 MBytes [ 5] 9.00-10.00 sec 336 MBytes 2.82 Gbits/sec 0 1.28 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 3.25 GBytes 2.79 Gbits/sec 0 sender [ 5] 0.00-10.00 sec 3.25 GBytes 2.79 Gbits/sec receiver iperf Done. REVISION DETAIL https://reviews.freebsd.org/D19422 AFFECTED FILES sys/net/if_vxlan.c EMAIL PREFERENCES https://reviews.freebsd.org/settings/panel/emailpreferences/ To: aleksandr.fedorov_itglobal.com, bryanv, hrs, #network Cc: ae, freebsd-net-list, krzysztof.galazka_intel.com
diff --git a/sys/net/if_vxlan.c b/sys/net/if_vxlan.c --- a/sys/net/if_vxlan.c +++ b/sys/net/if_vxlan.c @@ -2248,10 +2248,11 @@ ifr = (struct ifreq *) data; ifd = (struct ifdrv *) data; + error = 0; + switch (cmd) { case SIOCADDMULTI: case SIOCDELMULTI: - error = 0; break; case SIOCGDRVSPEC: @@ -2268,6 +2269,14 @@ error = ifmedia_ioctl(ifp, ifr, &sc->vxl_media, cmd); break; + case SIOCSIFMTU: + if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > ETHERMTU_JUMBO) { + error = EINVAL; + } else { + ifp->if_mtu = ifr->ifr_mtu; + } + break; + default: error = ether_ioctl(ifp, cmd, data); break; @@ -2748,8 +2757,8 @@ ifp->if_ioctl = vxlan_ioctl; ifp->if_transmit = vxlan_transmit; ifp->if_qflush = vxlan_qflush; - ifp->if_capabilities |= IFCAP_LINKSTATE; - ifp->if_capenable |= IFCAP_LINKSTATE; + ifp->if_capabilities |= IFCAP_LINKSTATE | IFCAP_JUMBO_MTU; + ifp->if_capenable |= IFCAP_LINKSTATE | IFCAP_JUMBO_MTU; ifmedia_init(&sc->vxl_media, 0, vxlan_media_change, vxlan_media_status); ifmedia_add(&sc->vxl_media, IFM_ETHER | IFM_AUTO, 0, NULL);
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