netdev - Re: [PATCH v2 net-next] net: use jump_label to shortcut RPS if not setup

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Message-Id: <20111117.170616.1995091290532624972.davem@davemloft.net>
Date:	Thu, 17 Nov 2011 17:06:16 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH v2 net-next] net: use jump_label to shortcut RPS if not
 setup

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 17 Nov 2011 14:13:26 +0100

> Most machines dont use RPS/RFS, and pay a fair amount of instructions in
> netif_receive_skb() / netif_rx() / get_rps_cpu() just to discover
> RPS/RFS is not setup.
> 
> Add a jump_label named rps_needed.
> 
> If no device rps_map or global rps_sock_flow_table is setup,
> netif_receive_skb() / netif_rx() do a single instruction instead of many
> ones, including conditional jumps.
> 
> jmp +0    (if CONFIG_JUMP_LABEL=y)
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> CC: Tom Herbert <therbert@...gle.com>
> ---
> V2: add netif_rx() optim as well

Applied, thanks.
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