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From: "Donatas" <donatas@lrtc.net>
To: "Gleb Smirnoff" <glebius@FreeBSD.org>
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Date: Mon, 16 May 2005 23:22:38 +0300
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cc: freebsd-net@freebsd.org
Subject: Re: flood with ng_bridge
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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.
=20
> 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                                              =
                                                          =20
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.=20

Currently used parameters on ng_bridge are:

# ngctl msg ng_bridge: getconfig
Rec'd response "getconfig" (2) from "[10f]:":
Args:   { debugLevel=3D1 loopTimeout=3D1 maxStaleness=3D900 =
minStableAge=3D10 }

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=3D3036543055 recvPackets=3D9193928 =
recvMulticast=3D75871 recvBroadcast=3D26 xmitOctets=3D9532655926 =
xmitPackets=3D51347925 xmitMulticasts=3D43833729 =
xmitBroadcasts=3D2174530 }