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Date: Wed, 10 Jun 2009 01:23:42 -0700 (PDT) From: David Miller <davem@...emloft.net> To: therbert@...gle.com Cc: netdev@...r.kernel.org Subject: Re: [PATCH v2] Receive Packet Steering From: Tom Herbert <therbert@...gle.com> Date: Sun, 3 May 2009 21:03:01 -0700 > This is an update of the receive packet steering patch (RPS) based on received > comments (thanks for all the comments). Improvements are: > > 1) Removed config option for the feature. > 2) Made scheduling of backlog NAPI devices between CPUs lockless and much > simpler. > 3) Added new softirq to do defer sending IPIs for coalescing. > 4) Imported hash from simple_rx_hash. Eliminates modulo operation to convert > hash to index. > 5) If no cpu is found for packet steering, then netif_receive_skb processes > packet inline as before without queueing. In paritcular if RPS is not > configured on a device the receive path is unchanged from current for > NAPI devices (one additional conditional). > > Signed-off-by: Tom Herbert <therbert@...gle.com> Just to keep this topic alive, I want to mention two things: 1) Just the other day support for the IXGBE "Flow Director" was added to net-next-2.6, it basically does flow steering in hardware. It remembers where the last TX for a flow was made, and steers RX traffic there. It's essentially a HW implementation of what we're proposing here to do in software. 2) I'm steadily still trying to get struct sk_buff to the point where we can replace the list handling implementation with a standard "struct list_head" and thus union that with a "struct call_single_data" so we can use remote cpu soft-irqs for software packet flow steering. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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