[mrtg] Re: bandwidth utilisation

[Alex van den Bogaerdt]

Barry_Young at interliant.com wrote:

> I am led to believe that RRDtool works better with 32-bit counters but as
> yet have been unable to implement this approach.

Both MRTG and RRDtool have no way of knowing that a counter has
incremented by more than 2^32. Switching to RRDtool doesn't help here.

The difference between RRDtool and MRTG occurs when a counter
rolls over, say from 2^32-1000 to 1000.
(note: this may have changed; I might need to use past tense here).

MRTG will assume the interval to be unknown in this case whereas
RRDtool will happily calculate the increment to be +2000.  This
also happens when a counter is reset (due to a device reset for
instance).

MRTG will therefore have lost an interval where RRDtool didn't.
On the other hand, MRTG doesn't suffer from a problem when a
counter is reset while RRDtool does.

HTH
-- 
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