Hi,

On Wed, Jun 13, 2018 at 2:40 PM, Florian Westphal [off-list ref] 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.

BR,
Kristian