netdev - Re: ixgbe question

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Message-ID: <4B1428FF.9010100@intel.com>
Date:	Mon, 30 Nov 2009 12:20:15 -0800
From:	John Fastabend <john.r.fastabend@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"robert@...julf.net" <robert@...julf.net>,
	"hawk@...u.dk" <hawk@...u.dk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: ixgbe question

Eric Dumazet wrote:
> 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.
>
>   
Eric,

I'll resubmit your patch with a small update to fix my concerns soon.

thanks,
john.
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