To: Rob Landley <rob@landley.net>
Cc: Theodore Tso <tytso@mit.edu>,
       James Bottomley <James.Bottomley@steeleye.com>,
       Matthew Wilcox <matthew@wil.cx>, linux-kernel@vger.kernel.org,
       linux-scsi@vger.kernel.org, Jens Axboe <axboe@suse.de>,
       Suparna Bhattacharya <suparna@in.ibm.com>,
       Nick Piggin <piggin@cyberone.com.au>
Subject: Re: What still uses the block layer?
In-Reply-To: Your message of "Mon, 15 Oct 2007 03:04:00 CDT."
             <200710150304.00901.rob@landley.net>
From: Valdis.Kletnieks@vt.edu
References: <200710112011.22000.rob@landley.net> <200710141845.44750.rob@landley.net> <20071015014503.GF9715@thunk.org>
            <200710150304.00901.rob@landley.net>
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Date: Wed, 17 Oct 2007 01:34:24 -0400
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On Mon, 15 Oct 2007 03:04:00 CDT, Rob Landley said:
> I note that the eth0 and eth1 names are dynamically assigned on a first come
> first serve basis (like scsi).  This never causes me a problem because the
> driver loading order is constant, and once you figure out that eth0 is
> gigabit and eth1 is the 80211g it _stays_ that way across reboots, reliably.
> Yeah, it's a heuristic.  Hands up everybody relying on such a heuristic in
> the real world.

I've gotten burned by that heuristic enough times to not rely on it.  My last
laptop had an ethernet on the motherboard, a *separate* ethernet in the docking
station, an ethernet on a multifunction pcmcia card (I usually just used the
modem side), and a wireless that looked like an ethernet - so it was possible
for a given interface to be eth1 (if no dock and no pcmcia card) or eth3 (if
both were present).  And that's on a laptop from almost 5 years ago.

And then there's the recent Sun and Dell 1U rack-mounts that have 4 ethernets
on the motherboard, and they *never* seem to assign in a 0,1,2,3 order that
matches the 0 1 2 3 printed above the 4 RJ45's ;)

So I have for years been a proponent of 'ethN is nailed by MAC address' :)

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