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Date: Mon, 30 Apr 2018 11:22:22 -0700
From: Greg KH <gregkh@linuxfoundation.org>
To: Eddie Chapman <eddie@ehuk.net>
Cc: Thomas Deutschmann <whissi@gentoo.org>, stable@vger.kernel.org,
        davem@davemloft.net, nicolas.dichtel@6wind.com,
        netdev@vger.kernel.org
Subject: Re: Request for stable 4.14.x inclusion: net: don't call update_pmtu
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On Fri, Apr 27, 2018 at 07:43:52PM +0100, Eddie Chapman wrote:
> On 27/04/18 19:07, Thomas Deutschmann wrote:
> > Hi Greg,
> > 
> > first, we need to cherry-pick another patch first:
> > >  From 52a589d51f1008f62569bf89e95b26221ee76690 Mon Sep 17 00:00:00 2001
> > > From: Xin Long <lucien.xin@gmail.com>
> > > Date: Mon, 25 Dec 2017 14:43:58 +0800
> > > Subject: [PATCH] geneve: update skb dst pmtu on tx path
> > > 
> > > Commit a93bf0ff4490 ("vxlan: update skb dst pmtu on tx path") has fixed
> > > a performance issue caused by the change of lower dev's mtu for vxlan.
> > > 
> > > The same thing needs to be done for geneve as well.
> > > 
> > > Note that geneve cannot adjust it's mtu according to lower dev's mtu
> > > when creating it. The performance is very low later when netperfing
> > > over it without fixing the mtu manually. This patch could also avoid
> > > this issue.
> > > 
> > > Signed-off-by: Xin Long <lucien.xin@gmail.com>
> > > Signed-off-by: David S. Miller <davem@davemloft.net>
> 
> Oops, I completely missed that the coreos patch doesn't have the geneve hunk
> that is in the original 4.15 patch. I don't load the geneve module on my box
> hence why no problems surfaced on my machine.

The geneve hunk doesn't apply at all to the 4.14.y tree, so I think
someone has a messed up tree somewhere...

I'll go look into this now.

greg k-h