netdev - Re: [PATCH v3 03/10] net: Add netdev interfaces recording send/compl

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Message-Id: <20111123.185812.1721878183759040757.davem@davemloft.net>
Date:	Wed, 23 Nov 2011 18:58:12 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH v3 03/10] net: Add netdev interfaces recording
 send/compl

From: Stephen Hemminger <shemminger@...tta.com>
Date: Wed, 23 Nov 2011 09:46:14 -0800

> Since all the drivers that you show do this for one packet at a time,
> why bother with a packets arguement to netdev_sent_queue()?

They batch the completion, that's why f.e. e1000e's changes keep track of
pkts_compl and bytes_compl, and then pass that in at the end of the TX
completion processing so that we only invoke these interfaces once per
run instead of once per packet.
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