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

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Message-ID: <20111123160320.76143e3b@nehalam.linuxnetplumber.net>
Date:	Wed, 23 Nov 2011 16:03:20 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH v3 03/10] net: Add netdev interfaces recording
 send/compl

On Wed, 23 Nov 2011 18:58:12 -0500 (EST)
David Miller <davem@...emloft.net> wrote:

> 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.

I was referring to the transmit routine, there for netdev_sent_queue()
is always called with one packet.

Many drivers batch packets in completion, and call netdev_completed_queue()
with multiple packets (and bytes).
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