netdev - Re: [PATCHv8 net-next 2/4] sunvnet: make transmit path zero-copy in the kernel

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Message-ID: <5429C498.1000705@oracle.com>
Date:	Mon, 29 Sep 2014 16:44:08 -0400
From:	David L Stevens <david.stevens@...cle.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org, sowmini.varadhan@...cle.com,
	raghuram.kothakota@...cle.com
Subject: Re: [PATCHv8 net-next 2/4] sunvnet: make transmit path zero-copy
 in the kernel

On 09/29/2014 04:29 PM, David Miller wrote:

> 
> It doesn't work to liberate SKBs in the TX ring purely from the
> ->ndo_start_xmit() method.
> 
> All SKBs given to a device must be liberated in a finite, short,
> amount of time.

I did consider putting a garbage-collector via timer on them, since
we got such a boost from not ACKing every packet. I guess the question
is "how short?"

For example, I could leave the "normal" path like this and just start/mod
a timer to do it after 1 sec if we haven't done it through start_xmit. Do
you think that's sufficiently short?

							+-DLS

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