Re: Extreme slowness in IPIP tunnel when routing through kernel 3.18 and later

[Patrick Boutilier <boutilpj@ednet.ns.ca>]

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On 03/17/2016 03:27 PM, Jesse Gross wrote:
> On Thu, Mar 17, 2016 at 7:02 AM, Patrick Boutilier <boutilpj@ednet.ns.ca> wrote:
>> I have an IPIP tunnel setup between two hosts in different buildings. The
>> Linux router they route through causes extreme slowness in the tunnel when
>> running kernels from 3.18 on . tcpdump shows many cksum errors which don't
>> show up in the 3.17 and earlier kernels. Speed goes back to normal when
>> rx-checksumming and tx-checksumming are turned off using ethtool on the
>> Linux router . Would this be an effect of bulk network packet transmission
>> that was introduced in 3.18 or some other issue?
>
> I just sent out a likely fix, would you mind testing it?
> https://patchwork.ozlabs.org/patch/599213/
>

Yes, that patch fixes the problem.

Thanks.

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