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

Hi Eli,

On Sun, 27 Nov 2016 11:54:41 +1100 Stephen Rothwell [off-list ref] wrote:

On Fri, 25 Nov 2016 14:05:04 +0800 Eli Cooper [off-list ref] wrote:

quoted

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 for the patch!

Its a bit tricky to test since the problem only occurs in a production
machine (I tried reproducing in a VM, but the problem did not occur),
but I will try to just rebuild the sit module and see if I can insert
the modified one.

OK, I tried your patch and unfortunately, it doesn't seem to have
worked ... I still get the large packets dropped and resent smaller.

-- 
Cheers,
Stephen Rothwell