From: Patrick Boutilier <boutilpj@ednet.ns.ca>
To: Jesse Gross <jesse@kernel.org>
Cc: Linux Kernel Network Developers <netdev@vger.kernel.org>
Subject: Re: Extreme slowness in IPIP tunnel when routing through kernel 3.18 and later
Date: Thu, 17 Mar 2016 18:13:23 -0300 [thread overview]
Message-ID: <56EB1DF3.5000606@ednet.ns.ca> (raw)
In-Reply-To: <CAEh+42h0hdNSQDZyHDWHE0qx8bf4AzP0ooaBxPXsj=bf-L5hFQ@mail.gmail.com>
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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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next prev parent reply other threads:[~2016-03-17 21:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-17 14:02 Extreme slowness in IPIP tunnel when routing through kernel 3.18 and later Patrick Boutilier
2016-03-17 16:47 ` Tom Herbert
2016-03-17 20:30 ` Patrick Boutilier
2016-03-17 18:27 ` Jesse Gross
2016-03-17 21:13 ` Patrick Boutilier [this message]
2016-03-17 21:18 ` Jesse Gross
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