netdev - Re: [PATCH 2.6.25 2/4]S2io: Multiqueue network device support

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Message-ID: <47C0FA1A.6090505@garzik.org>
Date:	Sun, 24 Feb 2008 00:01:14 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	David Miller <davem@...emloft.net>
CC:	kaber@...sh.net, Ramkrishna.Vepa@...erion.com,
	Sreenivasa.Honnur@...erion.com, netdev@...r.kernel.org,
	support@...erion.com
Subject: Re: [PATCH 2.6.25 2/4]S2io: Multiqueue network device support - FIFO
 selection based on L4 ports

David Miller wrote:
> From: Patrick McHardy <kaber@...sh.net>
> Date: Thu, 21 Feb 2008 00:08:52 +0100
> 
>> Ramkrishna Vepa wrote:
>>>> Sreenivasa Honnur wrote:
>>>>     
>>>>> - Resubmit #2
>>>>> - Transmit fifo selection based on TCP/UDP ports.
>>>>> - Added tx_steering_type loadable parameter for transmit fifo
>>>>>       
>>> selection.
>>>   
>>>>>   0x0 NO_STEERING: Default FIFO is selected.
>>>>>   0x1 TX_PRIORITY_STEERING: FIFO is selected based on skb->priority.
>>>>>   0x2 TX_DEFAULT_STEERING: FIFO is selected based on L4 Ports.
>>>>>
>>>>>       
>>>> Why duplicate the generic multiqueue classification?
>>>>     
>>> [Ram] Could you be more specific?
>>>   
>> The generic multiqueue support classifies packets by setting
>> skb->queue_mapping using qdisc classifiers, which is more
>> flexible and avoids using module parameters.
> 
> But it doesn't do what these multiqueue TX queue hardware devices
> want.  These devices don't want packet scheduler "classification",
> they want load balancing using some key (current cpu number,
> hashing on the packet headers, etc.)  And that's not what our
> packet scheduler classifiers do or should do.
> 
> We don't want to have to tell people "you have to run 'tc' magic
> foo to use all of the TX queues on your network card."  That's
> completely unreasonable and stupid.
> 
> We have to resolve this somehow, and there have been many discussions
> about this a month or so ago.

So where does that leave this patch?  :)

	Jeff




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