[Bug 277197] NFS is much too slow at 10GbaseT

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277197

--- Comment #9 from Hannes Hauswedell <h2+fbsdports@fsfe.org> ---
Thank you for the replies and sorry for my late reply (been travelling a lot
for work). I am still very interested in debugging this further!

@Peter Eriksson
It's hopeful to see higher speeds with FreeBSD on other devices at least.

> The X540 is a much older network card - around 5 years older than the X710. 
> I don't have any X540/ixgbe boards here so can't test that combo unfortunately, but looking at the feature sets it seems the X540 lacks the LRO feature...

Hm, but I do get much higher speeds on Linux, so how can this be a hardware
issue? I am not sure whether LRO is the crucial thing here, but at least
`ifconfig ix0` on the client does list LRO among its features:

# ifconfig -v ix0
ix0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0
mtu 9000
       
options=4e53fbb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_UCAST,WOL_MCAST,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6,HWSTATS,MEXTPG>
        ether 98:b7:85:1f:2e:72
        inet 192.168.3.80 netmask 0xffffff00 broadcast 192.168.3.255
        media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

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