netdev - Re: [PATCH net-next 0/5] mlxsw: Update adjacency index more efficiently

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Date:   Wed, 25 Nov 2020 15:53:57 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...sch.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH net-next 0/5] mlxsw: Update adjacency index more
 efficiently

On 11/25/20 12:35 PM, Ido Schimmel wrote:
> Example:
> 
> 8k IPv6 routes were added in an alternating manner to two VRFs. All the
> routes are using the same nexthop object ('nhid 1').
> 
> Before:
> 
> # perf stat -e devlink:devlink_hwmsg --filter='incoming==0' -- ip nexthop replace id 1 via 2001:db8:1::2 dev swp3
> 
>  Performance counter stats for 'ip nexthop replace id 1 via 2001:db8:1::2 dev swp3':
> 
>             16,385      devlink:devlink_hwmsg
> 
>        4.255933213 seconds time elapsed
> 
>        0.000000000 seconds user
>        0.666923000 seconds sys
> 
> Number of EMAD transactions corresponds to number of routes using the
> nexthop group.
> 
> After:
> 
> # perf stat -e devlink:devlink_hwmsg --filter='incoming==0' -- ip nexthop replace id 1 via 2001:db8:1::2 dev swp3
> 
>  Performance counter stats for 'ip nexthop replace id 1 via 2001:db8:1::2 dev swp3':
> 
>                  3      devlink:devlink_hwmsg
> 
>        0.077655094 seconds time elapsed
> 
>        0.000000000 seconds user
>        0.076698000 seconds sys
> 
> Number of EMAD transactions corresponds to number of VRFs / VRs.

wow, that is a huge difference - a good example of the efficiencies the
nexthop model allows.