netdev - Re: [RFC v2 bpf-next 8/9] bpf: Provide helper to do lookups in kernel FIB table

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Message-Id: <20180502.130024.362366635740254052.davem@davemloft.net>
Date:   Wed, 02 May 2018 13:00:24 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     dsahern@...il.com
Cc:     brouer@...hat.com, netdev@...r.kernel.org, borkmann@...earbox.net,
        ast@...nel.org, shm@...ulusnetworks.com, roopa@...ulusnetworks.com,
        toke@...e.dk, john.fastabend@...il.com, bernat@...fy.cx
Subject: Re: [RFC v2 bpf-next 8/9] bpf: Provide helper to do lookups in
 kernel FIB table

From: David Ahern <dsahern@...il.com>
Date: Wed, 2 May 2018 09:37:21 -0600

> To share numbers from recent testing I did using Vincent's modules,
> lookup times in nsec (using local_clock) with MULTIPLE_TABLES config
> disabled for IPv4 and IPv6
> 
>             IPv4    IPv6-dst    IPv6-fib6
> baseline     49        126         52
> 
> I have other cases with combinations of configs and rules, but this
> shows the best possible case.
> 
> IPv6 needs some more work to improve speeds with MULTIPLE_TABLES enabled
> (separate local and main tables unlike IPv4) and IPV6_SUBTREES enabled.

Yes, like for ipv4 sharing local and main tables will help a lot.