netdev - Re: Large performance regression with 6in4 tunnel (sit)

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Date:   Fri, 25 Nov 2016 13:45:20 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Eli Cooper <elicooper@....com>
Cc:     netdev@...r.kernel.org
Subject: Re: Large performance regression with 6in4 tunnel (sit)

Hi Eli,

On Fri, 25 Nov 2016 10:18:12 +0800 Eli Cooper <elicooper@....com> wrote:
>
> Sounds like TSO/GSO packets are not properly segmented and therefore
> dropped.
> 
> Could you first try turning off segmentation offloading for the tunnel
> interface?
>     ethtool -K sit0 tso off gso off

On Thu, 24 Nov 2016 18:30:14 -0800 Eric Dumazet <eric.dumazet@...il.com>
>
> You also could try to disable TSO and see if this makes a difference
> 
> ethtool -K sixtofour0 tso off

So turning off tso brings performance up to IPv4 levels ...

Thanks for that, it solves my immediate problem.
-- 
Cheers,
Stephen Rothwell