Incorrect throughput being seen in report and differing PGL configs

Mohammed Rakhada morakhad at
Thu Aug 4 14:22:42 UTC 2011

Hello Alex,

Thanks for your report, there isn't a problem here. It was my
interpretation of the data. I didn't realise the throughput was averaged
across the length of the test and so in my test as there was a slow ramp
period (and it was a short test) it was giving me the "middle" value.
All looks fine and as to be expected.

Thanks to Dmitry for his initial input, meant to reply to him earlier
but was just verifying some of my tests and results.

What would be nice would be to have a maximum and 95% measurement so
that we can see what the actual measured peak was.

As for the hosts and differing configs I've implemented the changes
Dmitry suggested and they work fine.


Mohammed Rakhada

On Thu, 2011-08-04 at 08:12 -0600, Alex Rousskov wrote:

> On 08/02/2011 11:15 AM, Dmitry Kurochkin wrote:
> > On Tue, 02 Aug 2011 14:51:09 +0100, Mohammed Rakhada <morakhad at> wrote:
> >> throughput: 4196.00xact/sec or 608.43Mbits/sec
> >>
> >> however when I am looking at the switch statistics the number reported
> >> is much lower (360Mbits/sec)
> >>
> >> Could you clarify what the throughput value actually relates to?
> >>
> > 
> > Throughput on the index page of HTML report is client side reply
> > throughput, i.e. (size of all replies clients received) / duration).  It
> > does not include requests or replies sent by servers.
> > 
> > I am not sure why you see lower throughput stats on the switch.  You may
> > get wrong stats in reporter if you specify a single log multiple times
> > on the command line.  I do not think it is likely, but this may be a bug
> > in Polygraph reporter or client.
> Another possibility here is that the switch is counting traffic volumes
> over a longer (or shorter!) periods of time while Polygraph reporter is
> using response volume during the specified test phase(s).
> If you want to investigate this further, running longer tests with fixed
> response sizes while looking at runtime switch stats may be useful.
> HTH.
> Alex.

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