netdev - Re: [RFC] napi: limit GRO latency

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Message-Id: <20121008.151035.1665672334154033755.davem@davemloft.net>
Date:	Mon, 08 Oct 2012 15:10:35 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	eric.dumazet@...il.com, rick.jones2@...com,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	jesse@...ira.com
Subject: Re: [RFC] napi: limit GRO latency

From: Stephen Hemminger <shemminger@...tta.com>
Date: Mon, 8 Oct 2012 11:58:35 -0700

> Limit the latency of pending GRO in NAPI processing to 2*HZ.
> When the system is under heavy network load, NAPI will go into
> poll mode via soft irq, and only stay in the loop for
> two jiffies. If this occurs, process the GRO pending list
> to make sure and not delay outstanding TCP frames for too long.
> 
> Rearrange the exit path to get rid of unnecessary goto logic.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

Did you see Eric's patch I just applied which limits it to 1ms?
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