netdev - RE: Using ethernet device as efficient small packet generator

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Date:	Fri, 21 Jan 2011 14:12:33 +0200
From:	"juice" <juice@...gman.org>
To:	"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

> Le vendredi 21 janvier 2011 Ã  13:44 +0200, juice a Ã©crit :
>
>
> 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)

root@...abralinux:/var/home/juice/pkt_test# cat /proc/net/pktgen/eth1
Params: count 10000000  min_pkt_size: 60  max_pkt_size: 60
     frags: 0  delay: 0  clone_skb: 10  ifname: eth1
     flows: 0 flowlen: 0
     queue_map_min: 0  queue_map_max: 0
     dst_min: 10.10.11.2  dst_max:
        src_min:   src_max:
     src_mac: 00:1b:21:7c:e5:b1 dst_mac: 00:04:23:08:91:dc
     udp_src_min: 9  udp_src_max: 9  udp_dst_min: 9  udp_dst_max: 9
     src_mac_count: 0  dst_mac_count: 0
     Flags:
Current:
     pkts-sofar: 10000000  errors: 0
     started: 2555660074us  stopped: 2569239323us idle: 3484us
     seq_num: 10000001  cur_dst_mac_offset: 0  cur_src_mac_offset: 0
     cur_saddr: 0x0  cur_daddr: 0x20b0a0a
     cur_udp_dst: 9  cur_udp_src: 9
     cur_queue_map: 0
     flows: 0
Result: OK: 13579248(c13575763+d3484) nsec, 10000000 (60byte,0frags)
  736417pps 353Mb/sec (353480160bps) errors: 0


> You can use perf tool to get some performance profile while your pktgen
> session is running
>
> # cd tools/perf
> # make
> ...
> # ./perf top
>

I can try that.
Where do I get the performance profiler tool?


Yours, Jussi Ohenoja


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