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

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Message-Id: <20111123.190623.2026426589805797580.davem@davemloft.net>
Date:	Wed, 23 Nov 2011 19:06:23 -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 16:03:20 -0800

> 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.

Optimism for the future? :-)

But yeah if nobody batches right now, no reason to support this in the
interfaces, we can add it later.
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