netdev - low vxlan throughput with tso enabled

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Message-ID: <bde634e5-3c57-4e80-9309-670cbd51c1b9@DE-WIE-EXCH3A.green.sophos>
Date:	Tue, 3 Feb 2015 16:50:39 +0100
From:	Reiner Herrmann <reiner.herrmann@...hos.com>
To:	<netdev@...r.kernel.org>
CC:	<svens@...ckframe.org>,
	Vittorio Curcio <Vittorio.Curcio@...hos.com>
Subject: low vxlan throughput with tso enabled

Hi!

I have a vxlan tunnel established between two network interfaces, which
both have a MTU of 1500. The vxlan interfaces have the same MTU.
With TSO enabled, I observe low throughput with TCP connections (<100 kB/s).
Disabling TSO works around this issue and throughput is as expected.
Can someone please explain how TSO is influencing the tunnel to cause
such a difference?

Kind regards,
Reiner

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