On Tue, 16 Jan 2018 at 15:47 Eric Garver <[email protected]> wrote:
[...]
> > Re-tested with the mainline kernel; gre_sys device is still configured
> with
> > a 1472 MTU, however I was then able to increase it using ip link set
> > gre_sys mtu XXXX, confirming that the kernel applied hardware limit was
> not
> > longer being enforced - however looks like the IFLA_MTU settings provided
> > from OVS are still being ignored by the kernel.
>
> What was the value of XXXX? Did you try 66535 (what OVS uses)? Any dmesg
> for the OVS case?
>
Good question:
# ip link set gre_sys mtu 65535
RTNETLINK answers: Invalid argument
# ip link set gre_sys mtu 9000
# ip link
[...]
18: gre_sys@NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc
pfifo_fast master ovs-system state UNKNOWN mode DEFAULT group default qlen
1000
link/ether ea:38:bd:61:29:4d brd ff:ff:ff:ff:ff:ff
so the value set by OVS was not accepted using ip as well.
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