* Mark Seger <[EMAIL PROTECTED]> 2007-12-18 08:37 > Anyhow, I just wanted to let people know that ALL tools that monitor > once a second on older counters will get the wrong numbers and tools > that correct for the wrong number by using fractional intervals (and I > suspect mine is the only one that does) but run on newer kernels will > also get the wrong numbers. In any event, if anyone is interested in > trying out collectl - it monitors a LOT more than just networks - you > can snag a copy of from http://collectl.sourceforge.net/ if you'd like > to take if for a drive. The website has a lot of output examples to > give you a better idea what it can do. I even included a writeup about > the odd network performance observations at > http://collectl.sourceforge.net/NetworkStats.html
I've solved this problem by using netlink to read the interface counters ten times per second and maintain an own counter from which I calculate the rate exactly once per second/minute/hour. The rate per second may still be inaccurate to some degree, therefore I keep a history of 2-5 rates and take them into account to smoothen the result. This works fairly well with _all_ operating systems. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
