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Date: Mon, 6 Dec 2010 14:33:52 +0800 From: Junchang Wang <junchangwang@...il.com> To: davem@...emloft.net, eric.dumazet@...il.com, robert.olsson@....uu.se, john.r.fastabend@...el.com, andy.shevchenko@...il.com Cc: netdev@...r.kernel.org Subject: [PATCH net-next-2.6] pktgen: adding prefetchw() call 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> --- net/core/pktgen.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 2953b2a..18fe20d 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -2660,6 +2660,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev, sprintf(pkt_dev->result, "No memory"); return NULL; } + prefetchw(skb->data); skb_reserve(skb, datalen); @@ -3007,6 +3008,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev, sprintf(pkt_dev->result, "No memory"); return NULL; } + prefetchw(skb->data); skb_reserve(skb, 16); -- --Junchang -- 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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