netdev - Re: ixgbe question

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Date:	Mon, 30 Nov 2009 14:02:08 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
CC:	john.r.fastabend@...el.com, peter.p.waskiewicz.jr@...el.com,
	robert@...julf.net, hawk@...u.dk, netdev@...r.kernel.org
Subject: Re: ixgbe question

David Miller a écrit :
> 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.

Sure, I guess we need a more generic way to handle this.

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