flood with ng_bridge

[Donatas]

hello,

> D> 3. Monitorring traffic with mrtg on ngethxxx and hatm0 interfaces we can se interesting output amplitude fluctations:
> D> ftp://temp:temp@217.9.241.242/hatm0.png
> D> seems that origin of those fluctations is ng_bridge.
 
> What is the timescale? How long one peak/pit lasts in time? I doubt that this
> is related to ng_bridge.
crontab:
### Regular MRTG monitoring                                                                                                         
0,10,20,30,40,50        *       *       *       *       root    /usr/local/etc/mrtg/exec_mrtg.sh > /dev/null 2>&1

we have ng_bridge, (bridged: fxp0, ngeth(1-xxx), hatm0)

ngethxxx are linked with hatm0 in the following way:
hatm0<->atmllc<->ng_vlan<->ng_eiface<->

we've tried tens of variuos configurations on determining the couse of those fluctuations. They seems to be not only in ng_bridge but in kernel.bridge as well. We've tried to change all 3 parameters in ng_bridge and still - those parameters doesn't seems to affect fluctuations. 

Currently used parameters on ng_bridge are:

# ngctl msg ng_bridge: getconfig
Rec'd response "getconfig" (2) from "[10f]:":
Args:   { debugLevel=1 loopTimeout=1 maxStaleness=900 minStableAge=10 }

as you see, no loops or loop drops are detected on any ngeth interafce as well:
# ngctl msg ng_bridge: getstats 6
Rec'd response "getstats" (4) from "[10f]:":
Args:   { recvOctets=3036543055 recvPackets=9193928 recvMulticast=75871 recvBroadcast=26 xmitOctets=9532655926 xmitPackets=51347925 xmitMulticasts=43833729 xmitBroadcasts=2174530 }