Re: [OpenWrt-Devel] [RFC][PATCH 2/2] bgmac: pass received packet to the netif instead of copying it

I performed some tests using Netgear WNDR4500 (BCM4706 based) using:
WNDR4500-V1.0.1.36_1.0.63.chk

On IRC we were wondering if switch does routing for the CPU, so I did
some trivial tests using "ifconfig".

Short introduction of available intefaces:

# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.204e7fab3aa8 no vlan1
eth1
eth2

So br0 bridge connects: vlan1, eth1, eth2. I don't really know why
there are eth2 and vlan2

I was using 192.168.5.2 for my WAN port
I was using 192.168.1.1 for my LAN ports

192.168.5.1 was a "gate" PC with iperf -s running. On my 192.168.1.X
machine I started iperf -c. So it was transfer of packets from LAN
vlan to WAN vlan.

iperf.exe -c 192.168.5.1 -t 60
------------------------------------------------------------
Client connecting to 192.168.5.1, TCP port 5001
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.1.3 port 55244 connected with 192.168.5.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-60.0 sec 4.02 GBytes 576 Mbits/sec

As you can see, I got ~500Mb/s in comparison to ~105Mb/s when using OpenWrt.

Now the most interesting part (I hope my mailer won't fail on formatting):

# ifconfig; sleep 10; ifconfig
br0 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3639 errors:0 dropped:0 overruns:0 frame:0
TX packets:4001 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:368045 (359.4 KiB) TX bytes:3516213 (3.3 MiB)

eth0 Link encap:Ethernet HWaddr 11:22:33:44:55:A9
inet addr:192.168.5.2 Bcast:192.168.5.255 Mask:255.255.255.0
inet6 addr: fe80::224e:7fff:feab:3aa9/64 Scope:Link
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:309084 errors:0 dropped:0 overruns:0 frame:0
TX packets:3126985 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19789406 (18.8 MiB) TX bytes:377801895 (360.2 MiB)
Interrupt:4 Base address:0x2000

eth1 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:424
TX packets:0 errors:65 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:3 Base address:0x8000

eth2 Link encap:Ethernet HWaddr 11:22:33:44:55:A7
inet6 addr: fe80::224e:7fff:feab:3aa7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:54 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:5 Base address:0x8000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MULTICAST MTU:16436 Metric:1
RX packets:107 errors:0 dropped:0 overruns:0 frame:0
TX packets:107 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:11408 (11.1 KiB) TX bytes:11408 (11.1 KiB)

vlan1 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:3127849 errors:0 dropped:0 overruns:0 frame:0
TX packets:310049 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:390393723 (372.3 MiB) TX bytes:20643844 (19.6 MiB)

vlan2 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)





br0 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3670 errors:0 dropped:0 overruns:0 frame:0
TX packets:4004 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:370146 (361.4 KiB) TX bytes:3516858 (3.3 MiB)

eth0 Link encap:Ethernet HWaddr 11:22:33:44:55:A9
inet addr:192.168.5.2 Bcast:192.168.5.255 Mask:255.255.255.0
inet6 addr: fe80::224e:7fff:feab:3aa9/64 Scope:Link
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:362946 errors:0 dropped:0 overruns:0 frame:0
TX packets:3671812 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:23236574 (22.1 MiB) TX bytes:1191974445 (1.1 GiB)
Interrupt:4 Base address:0x2000

eth1 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:424
TX packets:0 errors:65 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:3 Base address:0x8000

eth2 Link encap:Ethernet HWaddr 11:22:33:44:55:A7
inet6 addr: fe80::224e:7fff:feab:3aa7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:54 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:5 Base address:0x8000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MULTICAST MTU:16436 Metric:1
RX packets:119 errors:0 dropped:0 overruns:0 frame:0
TX packets:119 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:12532 (12.2 KiB) TX bytes:12532 (12.2 KiB)

vlan1 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:3672697 errors:0 dropped:0 overruns:0 frame:0
TX packets:363914 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1206747346 (1.1 GiB) TX bytes:24091669 (22.9 MiB)

vlan2 Link encap:Ethernet HWaddr 11:22:33:44:55:A8
inet6 addr: fe80::224e:7fff:feab:3aa8/64 Scope:Link
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)


So over 10s Netgear's firmware received ~700MiB of packets on vlan1
And it transferred ~700MiB of packets to eth0.

I believe it proves that Netgear's firmware doesn't use any built in
routing feature of the BCM53125 switch.