From molnarp@tartaros.CCS.ORNL.GOV Mon Aug 19 10:00:34 1996

On 8/15/96, performance testing was done on the ORNL xps150 and xps35
to determine what the maximum TCP/IP transfer rate is using the
GigaNet ATM nodes with the Accelerated TCP/IP support.  The testing
involved sending TCP/IP data from the 150 to the 35 at OC-12 speeds through 
a Fore ATM switch.  Maximum throughput was achieved when 7 compute
nodes were used on each system to transmit/recieve the data resulting
in an aggregate bandwidth of over 60 Megabytes per second.  The
tests were run using a modified version of ttcp which takes advantage
of the new system calls for the accelerated TCP/IP suuport.  One
ttcp session was run per compute node.  The transfer rate (as indicated 
from ttcp), the duration of each session and the startup time for 
multiple sessions (the standard deviation) are as follows:


OC-12 to OC-12
--------------
1 session:
	1.  12,543.11 KB/s		10.43 seconds

4 sessions:  
	1.  10,058.99 KB/s		13.03 seconds
	2.  10,019.50 KB/s		13.08 seconds
	3.  10,039.90 KB/s		13.06 seconds
	4.  10,135.65 KB/s		12.93 seconds

	Aggregate: 40,254.04 KB/s

5 sessions:  (startup time 3.53 seconds)
	1.   9,483.52 KB/s		13.82 seconds
	2.   9,324.20 KB/s		14.06 seconds
	3.   9,296.91 KB/s		14.10 seconds
	4.   9,361.56 KB/s		14.00 seconds
	5.  11,454.48 KB/s		11.44 seconds

	Aggregate: 48,920.67 KB/s

6 sessions:  (startup time 6.75 seconds)
	1.   9,069.16 KB/s		14.45 seconds
	2.   8,325.71 KB/s		15.74 seconds
	3.   8,918.16 KB/s		14.70 seconds
	4.   8,946.53 KB/s		14.65 seconds
	5.  10,991.69 KB/s		11.92 seconds
	6.  11,094.00 KB/s		11.81 seconds

	Aggregate: 57,345.72 KB/s

7 sessions:  (startup time 4.27 seconds)
	1.   9,989.38 KB/s		13.12 seconds
	2.  10,510.77 KB/s		12.47 seconds
	3.  10,747.56 KB/s		12.20 seconds
	4.   8,450.24 KB/s		15.51 seconds
	5.   8,560.46 KB/s		15.31 seconds
	6.   8,160.13 KB/s		16.06 seconds
	7.   8,617.16 KB/s		15.21 seconds

	Aggregate: 65,035.70 KB/s

8 sessions:  (startup time 6.43 seconds)
	1.   9,740.46 KB/s		13.46 seconds
	2.   8,364.75 KB/s		15.67 seconds
	3.   4,572.17 KB/s		28.67 seconds
	4.   4,887.38 KB/s		26.82 seconds
	5.   7,457.14 KB/s		17.58 seconds
	6.   7,694.83 KB/s		17.03 seconds
	7.   6,990.23 KB/s		18.75 seconds
	8.   7,993.87 KB/s		16.40 seconds

	Aggregate: 57,700.83 KB/s


OC-12 --> DS-3 --> OC-12
------------------------
2 sessions:
	1.   2,260.23 KB/s		57.99 seconds
	2.   2,262.34 KB/s		57.94 seconds

3 sessions:
	1.   1,509.14 KB/s		86.85 seconds
	2.   1,501.25 KB/s		87.31 seconds
	3.   1,507.20 KB/s		87.05 seconds

4 sessions:
	1.   1,155.89 KB/s		113.39 seconds
	2.   1,137.82 KB/s		115.20 seconds
	3.   1,137.29 KB/s		115.25 seconds
	4.   1,144.60 KB/s		114.93 seconds

5 sessions:
	1.   1,151.35 KB/s		113.84 seconds
	2.   1,135.26 KB/s		115.46 seconds
	3.   Did not complete - hung forever
	4.   1,136.12 KB/s		115.37 seconds
	5.   1,147.51 KB/s		114.22 seconds


OC-12 --> DS-3 --> (simulated delay of about .80 ms)** --> OC-12
------------------------------------------------------------
1 session:
	1.     662.97 KB/s		197.70 seconds

NOTE: ** With the simulated delay, a "ping" took 86 ms.
     data rates are for a 64K message, command was
  ./ttcp.user.nx -sz 1 -r -s -Gn1212 -p5012 -Gm256000 -GM256 -l65536 -b65535