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

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Message-ID: <1271920402.7895.4732.camel@edumazet-laptop>
Date:	Thu, 22 Apr 2010 09:13:22 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...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

Le jeudi 22 avril 2010 à 14:33 +0800, Changli Gao a écrit :
> 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.
> 
> 

No thanks, this is out of the question.

Talk to ixiacom guys, some people settle/dismantle dozens of network
device per second, on production machines.




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