netdev - Re: [PATCH v3] net: batch skb dequeueing from softnet input_pkt

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Date:	Thu, 22 Apr 2010 14:33:29 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Tom Herbert <therbert@...gle.com>, jamal <hadi@...erus.ca>
Subject: Re: [PATCH v3] net: batch skb dequeueing from softnet input_pkt_queue

On Thu, Apr 22, 2010 at 7:05 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le mercredi 14 avril 2010 à 17:52 +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 and irq disabling/enabling.
>>
>> Signed-off-by: Changli Gao <xiaosuo@...il.com>
>> ----
>
> lock contention _is_ a problem, Jamal tests can show it.
>
> irq disabling/enabling is not, and force to use stop_machine() killer.
>

Although irq_disabling/enabling is not, we should do our best to make
fast path as quickly as possible, and because stop_machine() is used
in slow patch, I think we can afford its weight.


-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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