From: Wei Wang <wei...@google.com> Date: Fri, 13 Oct 2017 15:08:07 -0700
> From: Wei Wang <wei...@google.com> > > In order to not dirty the cacheline too often, we try to only update > dst->__use and dst->lastusetime at most once per jiffy. > As dst->lastusetime is only used by ipv6 garbage collector, it should > be good enough time resolution. > And __use is only used in ipv6_route_seq_show() to show how many times a > dst has been used. And as __use is not atomic_t right now, it does not > show the precise number of usage times anyway. So we think it should be > OK to only update it at most once per jiffy. > > According to my latest syn flood test on a machine with intel Xeon 6th > gen processor and 2 10G mlx nics bonded together, each with 8 rx queues > on 2 NUMA nodes: > With this patch, the packet process rate increases from ~3.49Mpps to > ~3.75Mpps with a 7% increase rate. > > Note: dst_use() is being renamed to dst_hold_and_use() to better specify > the purpose of the function. > > Signed-off-by: Wei Wang <wei...@google.com> > Acked-by: Eric Dumazet <eduma...@googl.com> Also applied, thank you.
