Subject: Re: ixgbe question

From: Eric Dumazet <[email-masked]>
Date: Mon, 30 Nov 2009 14:02:08 +0100

David Miller a écrit :
> From: John Fastabend <[email-masked]>
> 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.