Comment # 5 on bug 1189508 from Lothar Paltins

(In reply to Neil Brown from comment #4)
Ok, I've tried to switch off all functions. There were these messages for some
of them:

# ethtool --offload enp7s0 tx-gso-partial off
Actual changes:
tx-gre-segmentation: off [not requested]
tx-gre-csum-segmentation: off [not requested]
tx-ipxip4-segmentation: off [not requested]
tx-ipxip6-segmentation: off [not requested]
tx-udp_tnl-segmentation: off [not requested]
tx-udp_tnl-csum-segmentation: off [not requested]
tx-gso-partial: off

# ethtool --offload enp7s0 tx-vlan-offload off
Actual changes:
tx-vlan-hw-insert: on [requested off]
Could not change any device features

# ethtool --offload enp7s0 rx-vlan-offload off
Actual changes:
tx-vlan-hw-insert: off [not requested]
rx-vlan-hw-parse: off

Now "ethtool --show-offload enp7s0 | grep -v fixed" shows everything as off.
But unfortunately, this doesn't change the behavior. The transfer speed is
almost the same as before and the nfs timeouts occurred again after reading
about 20GB from the server.