netdev - Re: [RFC] New driver API to speed up small packets xmits

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Date:	Thu, 10 May 2007 22:35:47 -0700
From:	Gagan Arneja <gaagaan@...il.com>
To:	Krishna Kumar2 <krkumar2@...ibm.com>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org,
	Rick Jones <rick.jones2@...com>,
	Sridhar Samudrala <sri@...ibm.com>
Subject: Re: [RFC] New driver API to speed up small packets xmits

Krishna Kumar2 wrote:
> I haven't seen reordering packets (I did once when I was having a bug in
> the requeue code, some TCP messages on receiver indicating packets out of
> order). When a send fails, the packet are requeued in reverse (go to end of
> the failed skb and traverse back to the failed skb and requeue each skb).
> Since new inserts go to the end, the queue is guaranteed to be in order.

queue_lock is dropped when you're in xmit. There's no guarantee packets 
won't be queued up while you're trying a transmit.

> 
> Thanks,
> 
> - KK
> 
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