Hi Stephen,
On 2016/11/25 10:45, Stephen Rothwell wrote:
> Hi Eli,
>
> On Fri, 25 Nov 2016 10:18:12 +0800 Eli Cooper <elicoo...@gmx.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.duma...@gmail.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.
I think this is similar to the bug I fixed in commit ae148b085876
("ip6_tunnel: Update skb->protocol to ETH_P_IPV6 in ip6_tnl_xmit()").
I can reproduce a similar problem by applying xfrm to sit traffic.
TSO/GSO packets are dropped when IPSec is enabled, and IPv6 throughput
drops to 10s of Kbps. I am not sure if this is the same issue you
experienced, but I wrote a patch that fixed at least the issue I had.
Could you test the patch I sent to the mailing list just now?
Thanks,
Eli
