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Message-ID: <20180913210325.5usfj2rorvuvtyc7@breakpoint.cc>
Date: Thu, 13 Sep 2018 23:03:25 +0200
From: Florian Westphal <fw@...len.de>
To: David Miller <davem@...emloft.net>
Cc: fw@...len.de, linux@...m.de, netdev@...r.kernel.org,
steffen.klassert@...unet.com, linux-kernel@...r.kernel.org,
torvalds@...ux-foundation.org, christophe.gouault@...nd.com
Subject: Re: Regression: kernel 4.14 an later very slow with many ipsec
tunnels
David Miller <davem@...emloft.net> wrote:
> From: Florian Westphal <fw@...len.de>
> Date: Thu, 13 Sep 2018 18:38:48 +0200
>
> > Wolfgang Walter <linux@...m.de> wrote:
> >> 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().
>
> I don't really see how recent changes can influence that.
I don't think there is a recent change that did this.
Walter says < 4.14 is ok, so this is likely related to flow cache removal.
F.e. it looks like all prefixed policies end up in a linked list
(net->xfrm.policy_inexact) and are not even in a hash table.
I am staring at b58555f1767c9f4e330fcf168e4e753d2d9196e0
but can't figure out how to configure that away from the
'no hashing for prefixed policies' default or why we even have
policy_inexact in first place :/
I'll look at this again tomorrow.
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