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Message-ID: <4D398C5A.90808@candelatech.com> Date: Fri, 21 Jan 2011 05:38:34 -0800 From: Ben Greear <greearb@...delatech.com> To: juice@...gman.org CC: Eric Dumazet <eric.dumazet@...il.com>, "Loke, Chetan" <chetan.loke@...scout.com>, Jon Zhou <jon.zhou@...u.com>, Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org Subject: Re: Using ethernet device as efficient small packet generator On 01/21/2011 04:12 AM, juice wrote: >> Le vendredi 21 janvier 2011 à 13:44 +0200, juice a écrit : >> >> >> You should try >> >> CLONE_SKB="clone_skb 10" >> ... >> pgset "$CLONE_SKB" >> >> >> Because I suspect you hit a performance problem on skb >> allocation/filling/use/freeing > > Actually, that makes the performance worse: > (Now I tried it with kernel 2.6.37, which is currently running) Maybe try clone-skb of 1000 or so. It zero's it's memory when allocating a packet which can be quite expensive. Also note that the Ethernet inter-frame gap isn't accounted for in the BPS, but it is a significant amount of the total bandwidth when using 64-byte packets. You are pushing a bit more than half of the theoretical limit of around 1,400,000 64-byte packets per second for 1Gbps ethernet. Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com -- 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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