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Date:   Tue, 23 Apr 2019 18:25:21 +0200
From:   Florian Westphal <fw@...len.de>
To:     Vakul Garg <vakul.garg@....com>
Cc:     Florian Westphal <fw@...len.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: ipsec tunnel performance degrade

Vakul Garg <vakul.garg@....com> wrote:
> > Vakul Garg <vakul.garg@....com> wrote:
> > > > Do you use xfrm interfaces?
> > >
> > > I don't think so. I use setkey to create policies/SAs.
> > > Can you please give me some hint about it?
> > 
> > Then you're not using ipsec interfaces.
> > 
> Instead of creating policies/SA using setkey, I shifted to using 'ip xfrm' commands.
> With this, I get good performance improvement (20% better in one case).
> Now xfrm_state_find() function is not taking much cpu.

Thats very strange, I have no explanation for this.
It would be good to find the cause, PF_KEY and 'ip xfrm'
are just different control plane frontends, they should have no impact
on data path performance.

> Is this what you meant by 'xfrm interfaces'?

No, i meant the xfrm network interfaces that were added recently, see
net/xfrm/xfrm_interface.c

> > I have no further suggestions.  I don't know yet when I will have time to look
> > into refcnt optimizations.
> > 
> > Idea would be to make them same as dev_hold/put.
> 
> I will try to address it. Can you provide some guidance? Thanks.

I will try to make ugly POC hack tomorrow that should
illustrate the general idea (and caveats/bugs that need fixing).

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