netdev - Re: [PATCH net-next v2] net: ipv6: avoid overhead when no custom FIB rules are installed

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Date:   Tue, 8 Aug 2017 13:10:53 -0600
From:   David Ahern <dsahern@...il.com>
To:     Vincent Bernat <vincent@...nat.im>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: ipv6: avoid overhead when no custom FIB
 rules are installed

On 8/8/17 12:23 PM, Vincent Bernat wrote:
> If the user hasn't installed any custom rules, don't go through the
> whole FIB rules layer. This is pretty similar to f4530fa574df (ipv4:
> Avoid overhead when no custom FIB rules are installed).
> 
> Using a micro-benchmark module [1], timing ip6_route_output() with
> get_cycles(), with 40,000 routes in the main routing table, before this
> patch:
...
> At the frequency of the host during the bench (~ 3.7 GHz), this is
> about a 100 ns difference on the median value.
> 
> A next step would be to collapse local and main tables, as in
> 0ddcf43d5d4a (ipv4: FIB Local/MAIN table collapse).
> 
> [1]: https://github.com/vincentbernat/network-lab/blob/master/lab-routes-ipv6/kbench_mod.c
> 
> Signed-off-by: Vincent Bernat <vincent@...nat.im>
> Reviewed-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/net/netns/ipv6.h |  1 +
>  net/ipv6/fib6_rules.c    | 40 +++++++++++++++++++++++++++-------------
>  net/ipv6/route.c         |  1 +
>  3 files changed, 29 insertions(+), 13 deletions(-)
> 

LGTM.

Acked-by: David Ahern <dsahern@...il.com>