netdev - Re: [PATCH net-next-2.6] pktgen: adding prefetchw() call

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Date:	Mon, 06 Dec 2010 08:26:38 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Junchang Wang <junchangwang@...il.com>
Cc:	davem@...emloft.net, robert.olsson@....uu.se,
	john.r.fastabend@...el.com, andy.shevchenko@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] pktgen: adding prefetchw() call

Le lundi 06 décembre 2010 à 14:33 +0800, Junchang Wang a écrit :
> We know for sure pktgen is going to write skb->data right after
> *_alloc_skb, causing unnecessary cache misses.
> 
> Idea is to add a prefetchw() call to prefetch the first cache line
> indicated by skb->data. On systems with Adjacent Cache Line Prefetch,
> it's probably two cache lines are prefetched.
> With this prefetch, pktgen on Intel SR1625 server with two E5530 
> quad-core processors and a single ixgbe-based NIC went from 8.63Mpps
> to 9.03Mpps, with 4.6% improvement.
> 
> 
> Signed-off-by: Junchang Wang <junchangwang@...il.com>
> ---

Acked-by: Eric Dumazet <eric.dumazet@...il.com>


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