netdev - Unequal balancing on bonds with links down

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Message-ID: <ee92daba1b8af8e3e2b743bcb0c4d25f@luffy.cx>
Date:	Fri, 01 Feb 2013 16:20:36 +0100
From:	Vincent Bernat <bernat@...fy.cx>
To:	<netdev@...r.kernel.org>
Subject: Unequal balancing on bonds with links down

Hi!

When a bond has one of its members down, the balancing becomes unequal. 
For example, a four-member bond with the first member down, all the 
traffic that should have been sent to this first member is sent to the 
next one. This may be a lot of additional traffic for one interface. 
This applies for both balance-xor and balance-rr. For balance-xor, the 
hash could be computed modulo the number of active interfaces. For 
balance-rr, inactive interfaces could be skipped. Is there some reason 
that selection of TX interface is not done this way? If there is none, I 
may come with a patch for this.
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