Subject: Re: atomic operations bottleneck in the IPv6 stack

From: Hannes Frederic Sowa <[email-masked]>
Date: Wed, 10 Dec 2014 18:16:03 +0100

On Mi, 2014-12-10 at 16:56 +0000, [email-masked] wrote:
> 
> It seems to me that the atomic operations on the IPv6 forwarding path
> are a bottleneck and they are not scalable with the number of cores.
> Am I right? What improvements can be brought to the IPv6 kernel code
> to make it less dependent of atomic operations/variables?

For a starter, something like the following commit:

commit d26b3a7c4b3b26319f18bb645de93eba8f4bdcd5
Author: Eric Dumazet <[email-masked]>
Date:   Tue Jul 31 05:45:30 2012 +0000

    ipv4: percpu nh_rth_output cache

Bye,
Hannes