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Date: Sun, 27 Nov 2016 14:23:40 +1100 From: Stephen Rothwell <sfr@...b.auug.org.au> To: Sven-Haegar Koch <haegar@...net.de> Cc: Eli Cooper <elicooper@....com>, netdev@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com> Subject: Re: Large performance regression with 6in4 tunnel (sit) Hi Sven-Haegar, On Fri, 25 Nov 2016 05:06:53 +0100 (CET) Sven-Haegar Koch <haegar@...net.de> wrote: > > Somehow this problem description really reminds me of a report on > netdev a bit ago, which the following patch fixed: > > commit 9ee6c5dc816aa8256257f2cd4008a9291ec7e985 > Author: Lance Richardson <lrichard@...hat.com> > Date: Wed Nov 2 16:36:17 2016 -0400 > > ipv4: allow local fragmentation in ip_finish_output_gso() > > Some configurations (e.g. geneve interface with default > MTU of 1500 over an ethernet interface with 1500 MTU) result > in the transmission of packets that exceed the configured MTU. > While this should be considered to be a "bad" configuration, > it is still allowed and should not result in the sending > of packets that exceed the configured MTU. > > Could this be related? > > I suppose it would be difficult to test this patch on this machine? The kernel I am running on is based on 4.7.8, so the above patch doesn't come close to applying. Most fo what it is reverting was introduced in commit 359ebda25aa0 ("net/ipv4: Introduce IPSKB_FRAG_SEGS bit to inet_skb_parm.flags") in v4.8-rc1. -- Cheers, Stephen Rothwell
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