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To: Dave Taht <dave.taht@gmail.com>, Mikael Abrahamsson <swmike@swm.pp.se>
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Date: Thu, 23 Aug 2018 23:01:50 +0200
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Subject: Re: [Bloat] [Cerowrt-devel] beating the drum for BQL
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Dave Taht <dave.taht@gmail.com> writes:

> One of the things not readily evident in trying to scale up, is the
> cost of even the most basic routing table lookup. A lot of good work
> in this area landed in linux 4.1 and 4.2 (see a couple posts here:
> https://vincent.bernat.im/en/blog/2017-performance-progression-ipv4-route-lookup-linux
> )
>
> Lookup time for even the smallest number of routes is absolutely
> miserable for IPv6 -
> https://vincent.bernat.im/en/blog/2017-ipv6-route-lookup-linux

The IPv6 routing lookup is on par with v4 these days. We got 7.2M pkts/s
in our XDP tests on a single core (although admittedly a fairly high-end
Intel one). Which allows you to route 10Gbps of 64-byte packets on two
cores...

-Toke