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

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Message-Id: <20180913.102305.939671149040995911.davem@davemloft.net>
Date:   Thu, 13 Sep 2018 10:23:05 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fw@...len.de
Cc:     linux@...m.de, netdev@...r.kernel.org,
        steffen.klassert@...unet.com, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org
Subject: Re: Regression: kernel 4.14 an later very slow with many ipsec
 tunnels

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.

And the bydst hashes have been dynamically sized for a very long time.

I might have missed something...