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.
Thanks Thomas for the correct instructions. Ignore my message Greg, I'll drop back into the shadows where I belong, sorry for the noise!