Shannon Gu
01/03/2008 12:16 PM
post4036
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Hi all,
We have recently started a project based on io-pkt infrastructure, how ever we've observed following symptoms
regarding network stack, I'd appreciate if anyone could shed some light on where this problem might come from? (network
stack setup/configuration or build)
============================================
#1 . ping test with bigger buffer (ping out / ping in has same symptom ):
[/]# ping -c 100 -s 4432 172.16.1.48
PING 172.16.1.48 (172.16.1.48): 4432 data bytes
4440 bytes from 172.16.1.48: icmp_seq=0 ttl=128 time=9 ms
4440 bytes from 172.16.1.48: icmp_seq=1 ttl=128 time=9 ms
4440 bytes from 172.16.1.48: icmp_seq=2 ttl=128 time=8 ms
4440 bytes from 172.16.1.48: icmp_seq=3 ttl=128 time=8 ms
4440 bytes from 172.16.1.48: icmp_seq=4 ttl=128 time=725 ms
----172.16.1.48 PING Statistics----
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 8/151/725 ms variance = 102977 ms^2
[/]# ping -c 100 -s 4433 172.16.1.48
PING 172.16.1.48 (172.16.1.48): 4433 data bytes
----172.16.1.48 PING Statistics----
100 packets transmitted, 0 packets received, 100% packet loss
[/]#
ping test with bigger buffer is OK within LAN , not cross LAN, and same behavior happens to both wired and wireless
interfaces (wireless interface using wpa_supplicant provided on the board to associate with AP in an open mode) , so I
suspect that there is an buffer issue at layer that is higher than layer2 (tcp/ip possible);
[/etc]# ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33192
inet 127.0.0.1 netmask 0xff000000
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ssid AcmeWifi
powersave off
bssid 00:03:52:e0:46:f0 chan 7
address: 00:06:80:00:a1:ed
media: IEEE802.11 autoselect (OFDM12 mode 11g)
status: active
inet 192.168.10.87 netmask 0xffffff00 broadcast 192.168.10.255
en0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
address: 00:55:44:33:22:11
inet 172.16.3.54 netmask 0xffff0000 broadcast 172.16.255.255
============= Ethernet interface en0 ==============
[/etc]# ping -s 5000 172.16.3.1
PING 172.16.3.1 (172.16.3.1): 5000 data bytes
5008 bytes from 172.16.3.1: icmp_seq=0 ttl=64 time=11 ms
5008 bytes from 172.16.3.1: icmp_seq=1 ttl=64 time=12 ms
----172.16.3.1 PING Statistics----
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 11/11/12 ms variance = 23 ms^2
[/etc]# ping -s 5000 172.16.1.48
PING 172.16.1.48 (172.16.1.48): 5000 data bytes
----172.16.1.48 PING Statistics----
221 packets transmitted, 0 packets received, 100% packet loss
[/etc]# ping 172.16.1.48
PING 172.16.1.48 (172.16.1.48): 56 data bytes
64 bytes from 172.16.1.48: icmp_seq=0 ttl=128 time=1 ms
64 bytes from 172.16.1.48: icmp_seq=1 ttl=128 time=1 ms
----172.16.1.48 PING Statistics----
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 1/1/1 ms variance = 0 ms^2
============== wireless interface ath0 =========
/etc]# ifconfig en0 down
[/etc]# ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33192
inet 127.0.0.1 netmask 0xff000000
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ssid Devicescape-Guest
powersave off
bssid 00:14:c2:a5:4c:41 chan 10
address: 00:06:80:00:a1:ed
media: IEEE802.11 autoselect (OFDM54 mode 11g)
status: active
inet 192.168.30.10 netmask 0xffffff00 broadcast 192.168.30.255
en0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
address: 00:55:44:33:22:11
inet 172.16.3.54 netmask 0xffff0000 broadcast 172.16.255.255
[/etc]# ping...
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