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Date:   Wed, 13 Jun 2018 15:43:59 +0200
From:   Kristian Evensen <>
To:     Florian Westphal <>
Cc:     David Miller <>,
        Network Development <>,
        Steffen Klassert <>,
Subject: Re: [PATCH net-next 0/10] xfrm: remove flow cache


On Wed, Jun 13, 2018 at 2:40 PM, Florian Westphal <> wrote:
> Can you test attached patch?
> I'd like to see how much the pcpu cache helps or if it actually hurts
> in your setup.
> Subject: [TEST PATCH 4.14.y] xfrm: remove pcpu policy cache
> We need to re-evaluate if this still buys anything after indirect calls
> got more expensive (retpolines).
> When pcpu xdst exists, it has to be validated first (which needs
> indirect calls).  So even if hit rate is good, it might be cheaper to
> allocate a new xdst entry.
> Furthermore, the current xdst cache needs to run with BH off, which
> is also not needed when its removed.
> Compile tested only.

Thanks! I will prepare a firmware for one of my devices tonight, start
testing tomorrow and report back when I have some results.


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