FreeBSD 11-STABLE: # pciconf -lv igb0 igb0@pci0:5:0:0: class=0x020000 card=0x153315d9 chip=0x15338086 rev=0x03 hdr=0x00 vendor = 'Intel Corporation' device = 'I210 Gigabit Network Connection' class = network subclass = ethernet # ifconfig igb0 | grep options options=6403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6> nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL> # FreeBSD 12-ALPHA6 (chips are essentially the same, one is flash- and other is flash-less) # pciconf -lv igb0 igb0@pci0:1:0:0: class=0x020000 card=0x00008086 chip=0x157b8086 rev=0x03 hdr=0x00 vendor = 'Intel Corporation' device = 'I210 Gigabit Network Connection' class = network subclass = ethernet # ifconfig igb0 | grep options options=e505bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,LRO,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6> nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL> # ifconfig igb0 tso6 # ifconfig igb0 | grep options options=e505bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,LRO,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6> nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL> #
Created attachment 197235 [details] Add ICAP_TSO6 capability for igb It looks like this capability got dropped. Can you try with the attached patch?
(In reply to Stephen Hurd from comment #1) Patch worked, but I can not prove, that option is really working (in hardware) as event without option perf3 flat-outs at 990Mbit/s :-)
A commit references this bug: Author: shurd Date: Thu Sep 20 20:06:45 UTC 2018 New revision: 338840 URL: https://svnweb.freebsd.org/changeset/base/338840 Log: Add IFCAP_TSO6 for igb It seems igb supports TSO6, but the capability got lost in the iflib update. Restore this capability. PR: 231476 Reported by: lev Reviewed by: erj Approved by: re (gjb) Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D17242 Changes: head/sys/dev/e1000/if_em.c
Fixed in r338840 Thanks for the report!