netdev - Re: ixgbe question

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Message-Id: <20091129.001856.236847721.davem@davemloft.net>
Date:	Sun, 29 Nov 2009 00:18:56 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	john.r.fastabend@...el.com
Cc:	peter.p.waskiewicz.jr@...el.com, eric.dumazet@...il.com,
	robert@...julf.net, hawk@...u.dk, netdev@...r.kernel.org
Subject: Re: ixgbe question

From: John Fastabend <john.r.fastabend@...el.com>
Date: Tue, 24 Nov 2009 13:14:12 +0000

> Believe the below patch will break DCB and FCoE though, both features
> have the potential to set real_num_tx_queues to greater then the
> number of CPUs.  This could result in real_num_tx_queues >
> num_tx_queues.
> 
> The current solution isn't that great though, maybe we should set to
> the minimum of MAX_TX_QUEUES and num_possible_cpus() * 2 + 8.
> 
> That should cover the maximum possible queues for DCB, FCoE and their
> combinations.
> 
> general multiq = num_possible_cpus()
> DCB = 8 tx queue's
> FCoE = 2*num_possible_cpus()
> FCoE + DCB = 8 tx queues + num_possible_cpus

Eric, I'm tossing your patch because of this problem, just FYI.
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