HELP! * GREY=local LOCAL HTML version of Foils prepared July 6,1995

Foil 29 Communique! (3)

From CPS600 Collaboration Presentation CPS600 Spring Semester 1995 Technologies for the Information Age -- March 1995. by Roman Markowski and Geoffrey Fox * See also color IMAGE
Message Packet Size MTU: ethernet=1500; FDDI=4532; ATM=9188 is conventional (use netstat -i)
MTU cannot be redefined in Communique! which is hard wired in optimization to Ethernet. InPerson allows one to change value of MTU
tcp_sendspace/ udp_sendspace/ tcp_recvspace/ udp_recvspace are UNIX kernel parameters which define TCP/IP actions. The buffer sizes (16K for sendspace) is too low for ATM and when increased to 60K one sees a performance boost of a factor of two for ATM.

Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

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