Awful forwarding rate [7.2-Release, igb]

[Michael Vince]

Also make sure that the route for this specific test isn't going out on 
the Internet and coming back in at your outside link speed of 
around117kbits/sec?

I had a similar problem once where I had 3 boxes hooked up and the 
speeds were blistering fast for 2 tests but the third test was horrid slow.
Turns out I simply forgot to add the route so the packets jumped across 
the local network, instead the packets were taking a route of a 
pointless jump out to my first upstream provider and back again :)

Mike


Oleg Baranov wrote:
> Hello!
>
> I have extremely low forwarding speed on 7.2-Release box with dual 
> Intel 82575.
>
> Box "B" with dual 82575 nic is connected between A and C using gigabit 
> swithes
> A <---> B <----> C
>
>
> iperf run from A to C shows:
>
> $ iperf -w 128k -c 192.168.111.3    
> ------------------------------------------------------------
> Client connecting to 192.168.111.3, TCP port 5001
> TCP window size:   129 KByte (WARNING: requested   128 KByte)
> ------------------------------------------------------------
> [  3] local 192.168.1.15 port 51077 connected with 192.168.111.3 port 
> 5001
> [ ID] Interval       Transfer     Bandwidth
> [  3]  0.0-11.2 sec    160 KBytes    117 Kbits/sec
>
>
>
> the same run from A to B shows:
>
> ]$ iperf -w 128k -c 192.168.1.153
> ------------------------------------------------------------
> Client connecting to 192.168.1.153, TCP port 5001
> TCP window size:   129 KByte (WARNING: requested   128 KByte)
> ------------------------------------------------------------
> [  3] local 192.168.1.15 port 60907 connected with 192.168.1.153 port 
> 5001
> [ ID] Interval       Transfer     Bandwidth
> [  3]  0.0-10.0 sec  1.09 GBytes    933 Mbits/sec
>
>
> and from B to C shows:
>
> $ iperf -w 128k -c 192.168.111.3
> ------------------------------------------------------------
> Client connecting to 192.168.111.3, TCP port 5001
> TCP window size:   129 KByte (WARNING: requested   128 KByte)
> ------------------------------------------------------------
> [  3] local 192.168.111.254 port 64290 connected with 192.168.111.3 
> port 5001
> [ ID] Interval       Transfer     Bandwidth
> [  3]  0.0-10.0 sec  1.08 GBytes    930 Mbits/sec
>
>
> Boxes B and C are both dual quad-core e5420 CPUs on Supermicro X7DWN+ 
> motherboard.
> As A I tried several machines including dual quad-core Phenom system 
> as well as some portable PCs and workstations residing in the same LAN.
>
> Here is ifconfig from B
>
> $ ifconfig
> igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
> 1500
>    options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
>    ether 00:30:48:c8:19:66
>    inet 192.168.1.153 netmask 0xffffff00 broadcast 192.168.1.255
>    media: Ethernet autoselect (1000baseTX <full-duplex>)
>    status: active
> igb1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
> 1500
>    options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
>    ether 00:30:48:c8:19:67
>    media: Ethernet autoselect (1000baseTX <full-duplex>)
>    status: active
>    lagg: laggdev lagg0
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
>    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
>    inet6 ::1 prefixlen 128
>    inet 127.0.0.1 netmask 0xff000000
> lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
> 1500
>    options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
>    ether 00:30:48:c8:19:67
>    inet 192.168.111.254 netmask 0xffffff00 broadcast 192.168.111.255
>    media: Ethernet autoselect
>    status: active
>    laggproto lacp
>    laggport: igb1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
> gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1280
>    tunnel inet 192.168.1.153 --> 192.168.1.156
>    inet 192.168.111.254 --> 192.168.112.254 netmask 0xffffffff
>
>
> I tried to remove lagg & gif interfaces, boot GENERIC kernel and even 
> set up same net config from LiveFS cd - nothing helps. Forwarding 
> speed sometimes goes up to 1-2 Mbit/sec while local speeds are always 
> above 900Mbit.
> System load is less 1%, logs contain nothing interesting...
>
> Any clues and ideas would be appreciated!!!!
>
>
>
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