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Date: Tue, 16 Dec 2008 19:12:24 +0100 (CET)
From: Harti Brandt <hartmut.brandt@dlr.de>
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To: Sergey Matveychuk <sem@FreeBSD.org>
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Subject: Re: bsnmpd & 64bits counters problem
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On Tue, 16 Dec 2008, Sergey Matveychuk wrote:

SM>Harti Brandt wrote:
SM>> On Tue, 16 Dec 2008, Sergey Matveychuk wrote:
SM>> 
SM>> SM>Hello.
SM>> SM>
SM>> SM>Some weird thing has happened with 64bit counters:
SM>> SM>
SM>> SM>% snmpwalk -v2c -cpublic localhost ifInOctets
SM>> SM>IF-MIB::ifInOctets.1 = Counter32: 4107815474
SM>> SM>...
SM>> SM>IF-MIB::ifInOctets.16 = Counter32: 2894713654
SM>> SM>
SM>> SM>% snmpwalk -v2c -cpublic localhost ifHCInOctets
SM>> SM>IF-MIB::ifHCInOctets.1 = Counter64: 7911064279758
SM>> SM>...
SM>> SM>IF-MIB::ifHCInOctets.4 = Counter64: 13143091216588
SM>> SM>
SM>> SM>There are all 16 32bits counters but only 4 64bits. That's less than
SM>> physical
SM>> SM>interfaces on this router (em0-em5).
SM>> SM>
SM>> SM>7.1-PRERELEASE
SM>> 
SM>> The highspeed counters are only there if this is a high-speed interface.
SM>> High speed means that the baudrate in the interface MIB (the one in the
SM>> kernel) must be larger than 20Mbaud.
SM>
SM>Well, these is lagg interfaces:
SM>lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9000
SM>        options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
SM>        ether 00:30:48:67:d4:68
SM>        media: Ethernet autoselect
SM>        status: active
SM>        laggproto lacp
SM>        laggport: em2 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
SM>        laggport: em0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
SM>
SM>There is no baudrate on them. But they are really high-speed however.

All interfaces have a baudrate. Its in net/if.h ifi_baudrate. We had the 
problem in the past with other interface types. 'virtual' interfaces must 
take care to somehow propagate the rate of the underlying physical 
interfaces up to the virtual one.

harti