Re: Incorrect Throughput Summaries in UDP?
On Thu, 27 Feb 2003, Kevin Gibbs wrote:
> What operating system are you using? It would appear that iperf did not
> find a 64bit integer to use as the total amount of traffic. As such you
> overflowed your 32bit integer at 4GB.
linux 7.2 - i compiled from source - is there a compile flag i should set?
Thanks,
Yee.
>
> Kevin
>
> On Thu, 27 Feb 2003, Yee-Ting Li wrote:
>
> > Hello,
> >
> > We're trying to do some iperf tests through an uncongested network using UDP
> > streams, reporting the rate every 2 seconds for 1 minute. We're using iperf
> > 1.6.5 with pthreads and we get some strange reporting of the summary result:
> >
> >
> > ------------------------------------------------------------
> > Server listening on UDP port 5010
> > Receiving 1472 byte datagrams
> > UDP buffer size: 2097152 Byte (WARNING: requested 1048576 Byte)
> > ------------------------------------------------------------
> > [ 3] local xxx.xxx.xxx.xxx port 5010 connected with
> > xxx.xxx.xxx.xxx port 32769
> > [ ID] Interval Transfer Bandwidth Jitter Lost/Total
> > Datagrams
> > [ 3] 0.0- 2.0 sec 204248832 Bytes 816993694 bits/sec 0.015 ms
> > 41676/180432 (23%)
> ...
> > [ 3] 58.0-60.0 sec 197239168 Bytes 788955489 bits/sec 0.012 ms
> > 47441/181435 (26%)
> > [ 3] 0.0-60.0 sec 1559126656 Bytes 207849079 bits/sec 0.012 ms
> > 1466661/5443627 (27%)
> > [ 3] 0.0-60.0 sec 2 datagrams received out-of-order
> >
> >
> >
> > As you can see, the summary rate is much smaller than that reported by the
> > regular intervals; also, the total number of bytes transfered is about a third
> > less than the accumulated count.
> >
> > We repeated the test a few times and the report is similar in all tests.
> >
> >
> > Any comments/suggestions appreciated!
> >
> > Yee.
> >
> >
> >
> >
>
--
*************************************************************************
Yee-Ting Li email: ytl --at-- hep.ucl.ac.uk
High Energy Particle Physics http://www.hep.ucl.ac.uk/~ytl
University College London Tel: +44 (0) 20 7679 1376
Gower Street Fax: +44 (0) 20 7679 7145
London, WC1E 6BT
United Kingdom
*************************************************************************