[smokeping-users] Re: graph question

Scott Schappell archon at silvertree.org
Wed Apr 13 15:47:53 MEST 2005

Hash: SHA1

Jason D. Hammerschmidt wrote:
> It does not appear to be so for me.  I've attached a 12KB PNG file 
> showing one of my monitored targets, I wish I could just link to it, 
> but it's an internal server only.  Hopefully no one is offended by my 
> 12KB attachment (I apologize in advance to any members of the bandwidth 
> conservation society).  As you can hopefully see, multiple grey colours 
> on some (not all) bars are seen, and the majority are above the line.  
> I do see a couple in the beginning of the graph where it's just one 
> tone of grey.

You have to understand the term "median". It doesn't mean average (thus
the colored bar would be in the middle), it means "there are an equal
number of values above and below".

Let's say you have 10 pings that look like this:

10 10 10 10 10 10 10 10 10 10 30

Your median is 10 (average is 11). Thus the colored line would be right
smack at the bottom and you'd have a very light gray bar going up to 30ms.

That means you have little jitter and that's a good thing.

Now if your ping is

10 100 10 20 30 40 50 60 100 15

the median is 35 (but the average would be 43.5) because at 35 there are
equal values below and above it. Then you would see bars of varying
darkness above and below the colored line.

Take a look at http://www.silvertree.org/smokeping.cgi?target=World.USWC

and you'll see examples of both cases.
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