netdev - Re: [PATCH v2 net-next 0/3] ipv4: Hash-based multipath routing

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Message-ID: <CAE4R7bDbqh786GfBJNu-NQ9WTgHZC+DgovRnzsnKTtWE5xPhow@mail.gmail.com>
Date:	Sat, 29 Aug 2015 13:55:54 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	pch@...bogen.com, Netdev <netdev@...r.kernel.org>,
	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, linux-api@...r.kernel.org,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Thomas Graf <tgraf@...g.ch>, jbenc@...hat.com
Subject: Re: [PATCH v2 net-next 0/3] ipv4: Hash-based multipath routing

On Sat, Aug 29, 2015 at 1:46 PM, David Miller <davem@...emloft.net> wrote:
> From: Peter Nørlund <pch@...bogen.com>
> Date: Sat, 29 Aug 2015 22:31:15 +0200
>
>> On Sat, 29 Aug 2015 13:14:29 -0700 (PDT)
>> David Miller <davem@...emloft.net> wrote:
>>
>>> From: pch@...bogen.com
>>> Date: Fri, 28 Aug 2015 22:00:47 +0200
>>>
>>> > When the routing cache was removed in 3.6, the IPv4 multipath
>>> > algorithm changed from more or less being destination-based into
>>> > being quasi-random per-packet scheduling. This increases the risk
>>> > of out-of-order packets and makes it impossible to use multipath
>>> > together with anycast services.
>>>
>>> Don't even try to be fancy.
>>>
>>> Simply kill the round-robin stuff off completely, and make hash based
>>> routing the one and only mode, no special configuration stuff
>>> necessary.
>>
>> I like the sound of that! Just to be clear - are you telling me to
>> stick with L3 and skip the L4 part?
>
> For now it seems best to just do L3 and make ipv4 and ipv6 behave the
> same.

That makes mapping the hash to offload hardware easier also.
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