netdev - Re: [RFC PATCH net-next v2] ipv6: implement consistent hashing for equal-cost multipath routing

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Message-ID: <58413EE4.7090002@uclouvain.be>
Date:   Fri, 2 Dec 2016 10:29:08 +0100
From:   David Lebrun <david.lebrun@...ouvain.be>
To:     Tom Herbert <tom@...bertland.com>
CC:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH net-next v2] ipv6: implement consistent hashing for
 equal-cost multipath routing

On 11/30/2016 05:04 AM, Tom Herbert wrote:
> This is a lot of code to make ECMP work better. Can you be more
> specific as to what the "issues" are? Assuming this is just the
> transient packet reorder that happens in one link flap I am wondering
> if this complexity is justified.

Unconsistent hashing is an issue when the load balancer is in front of
stateful backends, keeping per-flow state. Also, if neighbors are
constantly being added and removed, flows are constantly changing nexthops.

David


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