From: Eric Dumazet <eric.dumazet@gmail.com>
To: Junchang Wang <junchangwang@gmail.com>
Cc: davem@davemloft.net, robert.olsson@its.uu.se,
john.r.fastabend@intel.com, andy.shevchenko@gmail.com,
netdev@vger.kernel.org
Subject: Re: [PATCH net-next-2.6] pktgen: adding prefetchw() call
Date: Mon, 06 Dec 2010 08:26:38 +0100 [thread overview]
Message-ID: <1291620398.2806.311.camel@edumazet-laptop> (raw)
In-Reply-To: <20101206063349.GA6147@Desktop-Junchang>
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@gmail.com>
> ---
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
next prev parent reply other threads:[~2010-12-06 7:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-06 6:33 [PATCH net-next-2.6] pktgen: adding prefetchw() call Junchang Wang
2010-12-06 7:26 ` Eric Dumazet [this message]
2010-12-08 18:17 ` David Miller
2010-12-09 2:55 ` Junchang Wang
2010-12-10 23:37 ` David Miller
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