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

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Message-ID: <20180913135844.3ut6fxgx67t6ndtu@breakpoint.cc>
Date:   Thu, 13 Sep 2018 15:58:44 +0200
From:   Florian Westphal <fw@...len.de>
To:     Wolfgang Walter <linux@...m.de>
Cc:     netdev@...r.kernel.org, Florian Westphal <fw@...len.de>,
        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:
> thanks to the fix from Steffen Klassert I could now run 4.14.69 + his patch 
> and 4.18.7 + his patch without oopsing immediately.
> 
> But I found that those kernels perform very bad. They perform so bad that they 
> are unusable for our router with about 3000 ipsec tunnels (tunnel mode network 
> <-> network).

Can you do a 'perf record -a -g sleep 5' with 4.18 and provide 'perf
report' result?

It would be good to see where those cycles are spent.