Re: [PATCH 8/7] net/netfilter/nf_conntrack_core: Remove another memory barrier

[Will Deacon]

On Mon, Sep 05, 2016 at 08:57:19PM +0200, Manfred Spraul wrote:
> On 09/02/2016 09:22 PM, Peter Zijlstra wrote:
> Anyone around with a ppc or arm? How slow is the loop of the
> spin_unlock_wait() calls?
> Single CPU is sufficient.
> 
> Question 1: How large is the difference between:
> #./sem-scalebench -t 10 -c 1 -p 1 -o 4 -f -d 1
> #./sem-scalebench -t 10 -c 1 -p 1 -o 4 -f -d 256
> https://github.com/manfred-colorfu/ipcscale

Not sure exactly what you want me to run here, but with an arm64
defconfig -rc3 kernel, those two invocations give me "Max total" values
where the first is 20x bigger than the second.

Will