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

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Date:   Fri, 26 Oct 2018 00:45:28 +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@...emloft.net>,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        christophe.gouault@...nd.com, Greg KH <gregkh@...uxfoundation.org>
Subject: Re: Regression: kernel 4.14 an later very slow with many ipsec
 tunnels

Wolfgang Walter <linux@...m.de> wrote:
> there is now a new 4.19 which still has the big performance regression when 
> many ipsec tunnels are configured (throughput and latency get worse by 10 to 
> 50 times) which makes any kernel > 4.9 unusable for our routers.

https://git.breakpoint.cc/cgit/fw/net-next.git/log/?h=xfrm_pol_18

This is mostly untested, if you want to test this anyway and
find bugs please feel free to report them to me.

Improvements to test script in patch #1 welcome as well (its what
i've been using so far to test this).