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

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Date:	Fri, 20 Nov 2009 21:51:02 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...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)

Eric Dumazet <eric.dumazet@...il.com> writes:

> Here is first version of XPS.
>
> Goal of XPS is to free TX completed skbs by the cpu that submitted the transmit.
>
> Because I chose to union skb->iif with skb->sending_cpu, I chose
> to introduce a new xps_consume_skb(skb), and not generalize consume_skb() itself.
>
> This means that selected drivers must use new function to benefit from XPS
>
> Preliminary tests are quite good, especially on NUMA machines.
>
> Only NAPI drivers can use this new infrastructure (xps_consume_skb() cannot
> be called from hardirq context, only from softirq)
>
> I converted tg3 and pktgen for my tests

Do you have numbers on this? It seems like a lot of effort to avoid transfering
a few cache lines.

-Andi (who is a bit sceptical and would rather see generic work for this in slab)

-- 
ak@...ux.intel.com -- Speaking for myself only.
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