netdev - Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

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Message-Id: <20100901.090935.63038425.davem@davemloft.net>
Date:	Wed, 01 Sep 2010 09:09:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	shemminger@...tta.com, netdev@...r.kernel.org,
	eric.dumazet@...il.com
Subject: Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

From: Tom Herbert <therbert@...gle.com>
Date: Wed, 1 Sep 2010 08:41:14 -0700

>> Why don't we do this in the normal transmit processing.
>> There is already so much policy mechanism filters/actions/qdisc that
>> doing it in higher level is fighting against these.
>>
> Are you proposing that TX queue selection be done in the qdiscs?  The
> queue has to be selected before taking the lock (cannot afford taking
> a lock over the whole interface).  This would necessitate moving the
> locking and probably rearranging a lot of the xmit code around that.

Right, we really have to pick queues before entering the qdisc for
the full benefit of lock seperation.
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