netdev - Re: [PATCH net-next-2.6] net: Xmit Packet Steering (XPS)

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Date:	Fri, 20 Nov 2009 22:43:55 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] net: Xmit Packet Steering (XPS)

Jarek Poplawski a écrit :
> On Fri, Nov 20, 2009 at 03:45:42PM +0100, Eric Dumazet wrote:
>> Jarek Poplawski a écrit :
>>> On 20-11-2009 00:46, Eric Dumazet wrote:
>>> scheduled) IPIs?
>> Repeat after me :
>>
>> lockdep is my friend, lockdep is my friend, lockdep is my friend... :)
> 
> Hmm... Actually, why did I have to do lockdep's job...

In fact I could not find why irq masking is necessary, and lockdep is
fine with my code and my testings. Care to explain what problem you spotted ?


In fact, I originally used  cmpxchg() and xchg() (no spinlock),
but had to find the end of skb list in the IPI handler, so I chose
to use a skb_head instead to let the IPI handler be as short as possible.

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