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

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Date:	Fri, 12 Dec 2014 14:31:49 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Jarosch <thomas.jarosch@...ra2net.com>
Cc:	Wolfgang Walter <linux@...m.de>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [bisected] xfrm: TCP connection initiating PMTU discovery
 stalls on v3.

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.


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