netdev - Re: low vxlan throughput with tso enabled

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Message-ID: <93bef28b-0983-48cc-bbd1-06d2c49dad1e@DE-WIE-EXCH3A.green.sophos>
Date:	Wed, 4 Feb 2015 13:42:24 +0100
From:	Reiner Herrmann <reiner.herrmann@...hos.com>
To:	Rick Jones <rick.jones2@...com>, <netdev@...r.kernel.org>
CC:	<svens@...ckframe.org>,
	Vittorio Curcio <Vittorio.Curcio@...hos.com>
Subject: Re: low vxlan throughput with tso enabled

On 02/03/2015 05:36 PM, Rick Jones wrote:
> I've been under the impression that one generally wants the MTU of a tunnel interface to be no more than the MTU of the physical interface over which it runs, less the 
> size of the encapsulation headers used by the tunnel.  What happens when you make the MTU of the tunnel interface 1400 bytes instead of 1500?
Lowering the MTU also brings throughput back to normal, but I'm interested in
why disabling TSO also seems to help (even with the same MTU).
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