[mrtg] Re: Target addition problems

[Alex van den Bogaerdt]

On Thu, Sep 04, 2003 at 01:48:56PM -0400, Fruitman, Corey wrote:
> 
> I'm not sure how RRDTool knows if you're using a 64- or 32-bit counter (to determine the rollover), but if you're not polling using SNMPv2, you probably should be.  

A: previous counter value
B: current counter value

C = B - A		/* compute delta */
if (C < 0) {
   C += 2^32		/* select 32-bit counter */
   if (C < 0) {
      C -= 2^32		/* roll back 2^32 increase */
      C += 2^64		/* select 64-bit counter */
   }

HTH
Alex
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