Re: [bisected] xfrm: TCP connection initiating PMTU discovery stalls on v3.

Eric Dumazet
2014-12-12T22:31:52Z

On Fri, 2014-12-12 at 22:30 +0100, Thomas Jarosch wrote:

> if it's any help: Disabling TX checksumming prevents the hang
> even on an unpatched 3.14.x kernel. You could check with your debug statements
> in place the path of the packets with and without TX checksumming.

Disabling TX checksum automatically disables GSO.

Disabling TSO/GSO is the real 'cure' for the time being, you can keep TX
checksums.