vBNS Performance Sampling


Von Welch
Last Update: Wed Jul 3 09:38:02 1996 by Von Welch

vBNS Performance as Measured 6/14/96-6/20/96
Source Destination Window Size MSS Write Performance Read Performance
NCSA - PSC
NCSA Dec Alpha PSC Dec Alpha 512 KB 2048 bytes 55.6 Mb/s 57.1 Mb/s
vor.ncsa.uiuc.edu PSC DEC Alpha 512 KB 512 bytes 8.0 Mb/s 11.9 Mb/s
vor.ncsa.uiuc.edu PSC DEC Alpha 512 KB 2048 bytes 41.0 Mb/s 50.6 Mb/s
NCSA - SDSC
NCSA Dec Alpha SDSC Dec Alpha 512 KB 4312 bytes 58.0 Mb/s 49.2 Mb/s
NCSA Dec Alpha SDSC Dec Alpha 512 KB 536 bytes 18.4 Mb/s 13.7 Mb/s
jim.beckman.uiuc.edu monty.scripps.edu 512 KB 500 bytes 0.8 Mb/s 1.2 Mb/s
jim.beckman.uiuc.edu monty.scripps.edu 512 KB 1460 bytes 0.8 Mb/s 3.5 Mb/s
vor.ncsa.uiuc.edu monty.scripps.edu 512 KB 1448 bytes 0.9 Mb/s 4.2 Mb/s
PSC - SDSC
PSC Dec Alpha SDSC Dec Alpha 512 KB 2048 bytes 46.1 Mb/s 35.7 Mb/s
NCSA - NCSA
vor.ncsa.uiuc.edu NCSA DEC Alpha 512 KB 4096 bytes 65.3 Mb/s 43.4 Mb/s
jim.beckman.uiuc.edu NCSA DEC Alpha 512 KB 4300 bytes 11.8 Mb/s 9.5 Mb/s
jim.beckman.uiuc.edu vor.ncsa.uiuc.edu 512 KB 4300 bytes 10.6 Mb/s 8.8 Mb/s
jim.beckman.uiuc.edu vor.ncsa.uiuc.edu Default 4300 bytes 6.2 Mb/s 6.4 Mb/s
SDSC - SDSC
monty.scripps.edu SDSC DEC Alpha 512 KB 512 bytes 6.3 Mb/s 1.2 Mb/s
fenwick.scripps.edu SDSC DEC Alpha 512 KB 512 bytes 1.2 Mb/s 0.9 MB/s
monty.scripps.edu fenwick.scripps.edu Default 1460 bytes 6.4 Mb/s 6.3 Mb/s


Host Descriptions

jim.beckman.uiuc.edu
A FDDI-attached RS6000 located on the UIUC campus.
vor.ncsa.uiuc.edu
A FDDI-attached SGI Challenge located one hop away from the vBNS Cisco.
monty.scripps.edu
An ethernet-attached SGI (250 MHz IP22 processor) at Scripps
fenwick.scripps.edu
An ethernet-attached SGI (100 MHz IP20 processor) at Scripps


Testing Procedure

The throughputs were measures by running nettest five times betweeb the host pairs and taking the average read and write throughputs as returned by nettest. nettest sent and received 1000 60 KB buffers (except when performance was very poor in which case 100 60 KB buffers were used).