netdev - Re: [PATCH net-next-2.6] rps: avoid one atomic in enqueue_to

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Message-Id: <20100517.172249.232735178.davem@davemloft.net>
Date:	Mon, 17 May 2010 17:22:49 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH net-next-2.6] rps: avoid one atomic in
 enqueue_to_backlog

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 07 May 2010 11:51:21 +0200

> Le vendredi 07 mai 2010 à 07:16 +0200, Eric Dumazet a écrit :
>> Le jeudi 06 mai 2010 à 22:07 -0700, David Miller a écrit :
>> 
>> > Looks great, applied, thanks Eric.
>> 
>> Thanks, I have a followup to avoid one atomic in enqueue phase too ;)
>> 
> 
> [PATCH net-next-2.6] rps: avoid one atomic in enqueue_to_backlog
> 
> If CONFIG_SMP=y, then we own a queue spinlock, we can avoid the atomic
> test_and_set_bit() from napi_schedule_prep().
> 
> We now have same number of atomic ops per netif_rx() calls than with
> pre-RPS kernel.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Also applied, thanks Eric.
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