netdev - Re: Regression: kernel 4.14 an later very slow with many ipsec tunnels

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Date:   Thu, 13 Sep 2018 18:38:48 +0200
From:   Florian Westphal <fw@...len.de>
To:     Wolfgang Walter <linux@...m.de>
Cc:     Florian Westphal <fw@...len.de>, netdev@...r.kernel.org,
        Steffen Klassert <steffen.klassert@...unet.com>,
        David Miller <davem@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Regression: kernel 4.14 an later very slow with many ipsec
 tunnels

Wolfgang Walter <linux@...m.de> wrote:
> I'll try that but this isn't that easy as the router image does not contain 
> perf. I also have to do that on our production router. I try to do that 
> tomorrow evening.

No need if its too difficult.

> What I can say is that it depends mainly on number of policy rules and SA.

Thats already a good hint, I guess we're hitting long hash chains in
xfrm_policy_lookup_bytype().