netdev - Re: [PATCH 19/25] mlx4: Randomizing mac addresses for slaves

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Message-ID: <15ddcffd0911041333l165ee274mfae3508a3db755e7@mail.gmail.com>
Date:	Wed, 4 Nov 2009 23:33:28 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Yevgeny Petrilin <yevgenyp@...lanox.co.il>,
	linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
	liranl@...lanox.co.il, tziporet@...lanox.co.il
Subject: Re: [PATCH 19/25] mlx4: Randomizing mac addresses for slaves

On Wed, Nov 4, 2009 at 10:04 PM, Roland Dreier <rdreier@...co.com> wrote:
>> +#define MLX4_MAC_HEAD               0x2c9000000ULL

> Is this a good idea?  You're basically choosing 24 random bits within your OUI...
> seems the chance of collision with another MAC used on the same network is
> high enough that it could easily happen in practice on a moderately big network.

yes, this has been brought by Stephen and others on this last back on
September 11th, this year @
http://marc.info/?l=linux-netdev&m=125263488409128

> Can you pick a reserved range or something?

Using different OUI for the VF device wouldn't help either I think,
since the #VF becomes fairly big even on a modest side cluster with
(say) a VM consuming VF per 1-2 cores.

Or.
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