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

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Message-ID: <20100502104304.6c6b2764@infradead.org>
Date:	Sun, 2 May 2010 10:43:04 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, hadi@...erus.ca,
	xiaosuo@...il.com, therbert@...gle.com, shemminger@...tta.com,
	netdev@...r.kernel.org, lenb@...nel.org
Subject: Re: [PATCH v6] net: batch skb dequeueing from softnet
 input_pkt_queue

On Sun, 02 May 2010 18:35:31 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote
> 
> 
> You mean we can wakeup a thread with something else than an IPI ?
> 

actually we can.

mwait is not only "go idle", it is "go idle until someone writes to
<THIS> cacheline". where <THIS> is set up with a "monitor" instruction.
We don't need to send an ipi per se.. all we need is to write to the
right cacheline that we're monitoring.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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