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

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Date:	Thu, 17 Mar 2016 18:13:23 -0300
From:	Patrick Boutilier <boutilpj@...et.ns.ca>
To:	Jesse Gross <jesse@...nel.org>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Extreme slowness in IPIP tunnel when routing through kernel 3.18
 and later

On 03/17/2016 03:27 PM, Jesse Gross wrote:
> On Thu, Mar 17, 2016 at 7:02 AM, Patrick Boutilier <boutilpj@...et.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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