Le vendredi 21 janvier 2011 à 13:44 +0200, juice a écrit :

Hi again.

It has been a while since last time I got to be able to test this
again, as there have been some other matters at hand.
However, now I managed to rerun my tests in several different kernels.

I am using now a PCIe Intel e1000e card, that should be able to handle
the needed traffic amount.

The statistics that I get are as follows:

kernel 2.6.32-27 (ubuntu 10.10 default)
    pktgen:           750064pps 360Mb/sec (360030720bps)
    AX4000 analyser:  Total bitrate:             383.879 MBits/s
                      Bandwidth:                 38.39% GE
                      Average packet intereval:  1.33 us

kernel 2.6.37 (latest stable from kernel.org)
    pktgen:           786848pps 377Mb/sec (377687040bps)
    AX4000 analyser:  Total bitrate:             402.904 MBits/s
                      Bandwidth:                 40.29% GE
                      Average packet intereval:  1.27 us

kernel 2.6.38-rc1 (latest from kernel.org)
    pktgen:           795297pps 381Mb/sec (381742560bps)
    AX4000 analyser:  Total bitrate:             407.117 MBits/s
                      Bandwidth:                 40.72% GE
                      Average packet intereval:  1.26 us

...

pktgen:

Params: count 10000000  min_pkt_size: 60  max_pkt_size: 60
     frags: 0  delay: 0  clone_skb: 1  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: 77203892067us  stopped: 77216465982us idle: 1325us
     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: 12573914(c12572589+d1325) nsec, 10000000 (60byte,0frags)
  795297pps 381Mb/sec (381742560bps) errors: 0


AX4000 analyser:

   Total bitrate:             407.117 MBits/s
   Bandwidth:                 40.72% GE
   Average packet intereval:  1.26 us

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

You can use perf tool to get some performance profile while your pktgen
session is running

# cd tools/perf
# make
...
# ./perf top