Bulk Thruput Measurements-SLAC TO Stanford's Campus
Bulk Thruput Measurements | Bulk throughput simulation | Windows vs. streams | Effect of load on RTT and loss | Bulk file transfer measurements
The elaine hosts at Stanford are a cluster of Sun 4u Sparc Ultra-60s running Solaris 5.7 and providing interactive services to many users. As such they are typically heavily loaded during normal hours.
Between September 20 and October 28, the link from Stanford to SLAC was upgraded from OC3 (155Mbps) to OC12 (622Mbps), and the SLAC interface to the outside was changed from a 100 Mbps half duplex FDDI ring to a gigabit ethernet. However, the major limit on performance is probably the 100Mbit/s fast Ethernet connections to the end nodes. The path characteristics measured by pchar indicates that the bottleneck is at the link to pharlap.
At one time we had the pharlap host cofigured for 100 Mbps half duplex but the
switch port it was connected to configured for 100Mbps full duplex.
In this case the
maximum thruput from SLAC dropped to 9 Mbits/s or almost a factor of 10 drop
in performance. At the same time pchar showed no apparent loss in
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Summary of Bulk Throughput Measurements
Created August 25, 2000, last update August 29, 2001.
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