netdev - Re: [PATCHv3 net-next] sunvnet: Avoid sending superfluous LDC messages.

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Message-Id: <20140912.181925.2227644293597000085.davem@davemloft.net>
Date:	Fri, 12 Sep 2014 18:19:25 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sowmini.varadhan@...cle.com
Cc:	raghuram.kothakota@...cle.com, netdev@...r.kernel.org,
	bob.picco@...cle.com
Subject: Re: [PATCHv3 net-next] sunvnet: Avoid sending superfluous LDC
 messages.

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Date: Thu, 11 Sep 2014 09:57:22 -0400

> When sending out a burst of packets across multiple descriptors,
> it is sufficient to send one LDC "start" trigger for
> the first descriptor, so do not send an LDC "start" for every
> pass through vnet_start_xmit. Similarly, it is sufficient to send
> one "DRING_STOPPED" trigger for the last dring (and if that
> fails, hold off and send the trigger later).
> 
> Optimizations to the number of LDC messages helps avoid
> filling up the LDC channel with superfluous LDC messages
> that risk triggering flow-control on the channel,
> and also boosts performance.
> 
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
> Acked-by: Raghuram Kothakota <raghuram.kothakota@...cle.com>

Applied, thanks.
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