netdev - Re: [PATCH v6] net: batch skb dequeueing from softnet input_pkt

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Date:	Tue, 27 Apr 2010 15:08:17 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	xiaosuo@...il.com, hadi@...erus.ca, therbert@...gle.com,
	shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH v6] net: batch skb dequeueing from softnet
 input_pkt_queue

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 23 Apr 2010 12:26:06 +0200

> Le vendredi 23 avril 2010 à 16:12 +0800, Changli Gao a écrit :
>> batch skb dequeueing from softnet input_pkt_queue.
>> 
>> batch skb dequeueing from softnet input_pkt_queue to reduce potential lock
>> contention when RPS is enabled.
>> 
>> Note: in the worst case, the number of packets in a softnet_data may be double
>> of netdev_max_backlog.
>> 
>> Signed-off-by: Changli Gao <xiaosuo@...il.com>
>> ----
> 
> Oops, reading it again, I found process_backlog() was still taking the
> lock twice, if only one packet is waiting in input_pkt_queue.
> 
> Possible fix, on top of your patch :

I've applied Changli's patch with this fixup added to it.

If there are any follow-on changes necessary after further analysis,
please send patches on top of this work.

Thanks.
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