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From: Ben Greear <greearb@candelatech.com>
To: juice@swagman.org
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
	"Loke, Chetan" <chetan.loke@netscout.com>,
	Jon Zhou <jon.zhou@jdsu.com>,
	Stephen Hemminger <shemminger@vyatta.com>,
	netdev@vger.kernel.org
Subject: Re: Using ethernet device as efficient small packet generator
Date: Fri, 21 Jan 2011 05:38:34 -0800	[thread overview]
Message-ID: <4D398C5A.90808@candelatech.com> (raw)
In-Reply-To: <37bfb9ca79c2325ec4b70033f509200a.squirrel@www.liukuma.net>

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@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

  reply	other threads:[~2011-01-21 13:38 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-30  1:11 Using ethernet device as efficient small packet generator Loke, Chetan
2011-01-21 11:44 ` juice
2011-01-21 11:51   ` Eric Dumazet
2011-01-21 12:12     ` juice
2011-01-21 13:38       ` Ben Greear [this message]
2011-01-21 22:09   ` Brandeburg, Jesse
2011-01-23 21:48     ` juice
2011-01-24  8:10       ` juice
2011-01-24  9:18         ` Eric Dumazet
2011-01-24 16:34         ` Eric Dumazet
2011-01-24 20:51           ` juice
2011-02-02  8:13       ` juice
  -- strict thread matches above, loose matches on Subject: below --
2010-12-23  5:15 juice
2010-12-23  8:57 ` Jon Zhou
2010-12-23 10:50   ` juice
2010-12-22  7:30 juice
2010-12-22  8:08 ` Eric Dumazet
2010-12-22 11:11   ` juice
2010-12-22 11:28     ` Eric Dumazet
2010-12-22 15:48   ` Jon Zhou
2010-12-22 15:59     ` Eric Dumazet
2010-12-22 16:52       ` Jon Zhou
2010-12-22 17:18         ` Eric Dumazet
2010-12-22 17:40           ` Jon Zhou
2010-12-22 17:51             ` Eric Dumazet
2010-12-22 17:15       ` Jon Zhou
2010-12-21  9:56 juice
2010-12-21 18:22 ` Stephen Hemminger

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