systat -ifstat reports double up

[thorolason]

I have a 3 interface firewall running 2.1-BETA0 (amd64)  built on Sun Sep 2 20:13:58 EDT 2012

ix1 - LAN 10G
igb0 - WAN 1G
ix2 - DMZ 10G

running
systat -ifstat
with some test traffick  
LAN <->  DMZ
WAN <-> DMZ
syststat reports the double traffic for each interface.

ix2  in    162.280 MB/s        195.464 MB/s           12.752 TB
                out   212.717 MB/s        230.160 MB/s           16.718 TB

ix1  in    116.436 MB/s        116.638 MB/s            7.238 TB
                out    45.712 MB/s         82.588 MB/s            3.713 TB

igb0  in     96.046 MB/s        113.383 MB/s            8.248 TB
                out   174.124 MB/s        177.148 MB/s           12.529 TB

note that igb0 is a 1Gb interface and therefore theoretically cannot exceed 125 MB/s

Checking the linux boxes generating the traffic and the HP switch reveals that the values reported by
systat -ifstat  are more or less double of the actual traffic.

Cheers / Thor