Interface load > 100% how come?

Tatsuo Natsukawa (natsu@natsu.itjit.ad.jp)
Thu, 05 Sep 1996 10:35:42 +0900

Hello,

I have a trivial question.

I think ifload, which comes with scotty, and tkined uses the following
formula to compute an interface load:

## Calculate the interface utilisation. This is done using the formula
##
## util = ( 8 * ( delta (ifInOctets, t1, t0)
## + delta (ifOutOctets, t1, t0) ) / (t1 - t0) ) / ifSpeed
##
## This formula returns incorrect results for full-duplex point to point
## links. In this case, the following formula should be used:
##
## util = ( 8 * max ( delta (ifInOctets, t1, t0) ,
## delta (ifOutOctets, t1, t0) ) / (t1 - t0) ) / ifSpeed
##
## See Simple Times, 1(5), November/December, 1992 for more details.

Sometimes, ifload and tkined report an interface load greater than
100%, e.g. 106%. How could it be?

Just wondering,
--------------------------------------------------------------------
Tatsuo Natsukawa natsu@itjit.ad.jp http://www.itjitnet.or.jp/~natsu/
finger natsu@natsu.itjit.ad.jp for my PGP public key