SLAC to SDSC
The measurements were made between pharlap.slac.stanford.edu and torah.sdsc.edu
at the San Diego Supercomputer Center, San Diego, California, USA.
Pharlap is a Sun E4500 with
6*336MHz cpus and maximum buffer size of 8Mbytes running
Solaris 5.8. Torah is a Sun E10K with 8*333 MHz running Solaris 5.7,
a GE interface to the campus network.. The pipechar
from SLAC to torah indicates that the route is via ESnet to Sunnyvale where it
crosses to CalREN2/UCAID. The bottleneck appears to be the last hop to torah and
is 130Mbits/s. SLAC had an OC3 interface to ESnet at this time. The CalREN2
connection to UCSD was at OC12.
Measurements made on September 27 '01, from pharlap to torah are shown to the right. They indicate that
the throughput maxima are around 119Mbps (the top 10% throughputs measured are above
It is apparent that with a single stream with the 1MByte window one can get
close to the maxima of throughputs.
The unloaded RTT from SLAC to SDSC was min/avg/max (std)=27.7/29.4/581 (2) msec. This corresponds to
a window size of about 580KBytes for a bottleneck of 1118Mbits/s. We repeated
the measurements from pharlap to okra.ucsd.edu a Sun 440 MHz Ultra 10 with a
both a 100Mbps and a GE interface running Solaris 5.8. the maximum throughput we
could achieve was about 10Mbps. The pipechar
supported this conclusion.
SDSC to SLAC
On October 1, 2001 we made measurements of iperf TCP throughput from multivac.sdsc.edu
to pharlap.slac.stanford.edu. Multivac was a Sun E450 with 4*400MHz cpus
running Solaris 5.8. I had a GE interface and the connection from SDSC to
the Internet was at OC12 (622Mbps).
The ping RTTs were min/avg/max = 26/28/108 msec.
The throughput results are shown below. the maxima (i.e. throughput for the
top 10% of the measurements) were over 457Mbits/s.
Summary of Bulk Throughput Measurements
Created September 27, 2001, last update September 27, 2001.
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