netdev - Re: [PATCH v2] bonding: start slaves with link down for ARP monitor

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Date:	Tue, 17 Apr 2012 13:58:07 +0200
From:	Michal Kubeček <mkubecek@...e.cz>
To:	Jay Vosburgh <fubar@...ibm.com>
Cc:	Flavio Leitner <fbl@...hat.com>, netdev@...r.kernel.org,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH v2] bonding: start slaves with link down for ARP monitor

On Monday 16 of April 2012 12:27EN, Michal Kubeček wrote:
> On Saturday 14 of April 2012 21:48EN, Jay Vosburgh wrote:
> > Anybody got a 10 or 100 card laying around with fast autoneg to
> > try?  Back in the day I used 3c59x and e100s, and I seem to recall
> > that the 3c59x board I had was pretty speedy at going carrier up.
> 
> It seems these cards are hard to find these days (I tried to find one
> in our office but no luck yet). However, I tried an onboard adapter
> with r8169 driver and patched kernel succeeded to detect carrier in
> time for bonding driver to start the slave in "up" state (and it
> started in "down" state with unplugged cable so that the detection is
> correct).

I tested few more cards:

- two 100 Mb/s Realtek 8139C and 8139D with 8139too driver:
  driver sets carrier on soon enough and slave starts with "up" and
  stays that way (same as r8169)

- 1 Gb/s Intel Pro/1000PT (82572EI) with e1000e driver:
  essentially the same as igb, driver is slow and patch prevents the
  up -> down -> up sequence by starting the slave in "down" state

- 100 Mb/s Intel (?) cards with DECchip Tulip 21142/3, tulip driver:
  card/driver either doesn't set the flag properly or is extremely slow
  with up -> down transition so that the state was "up" all the time
  no matter what the real link state was

I'll resend v3 with fixed style problem in a moment.

                                                        Michal Kubecek

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