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Network Working Group John E. Kreznar
RFC-19 SDC
7 october 1969
Two protocol suggestions that can be used to reduce the blocking of limited exchange nodes
(RFC19 TWO Protocol Suggestions to Reduce Congestion At swap-bound nodes)
In the host system of the ARPA IMP network node, the information exchange rate between the main memory and the aid is very large.
difference. For the 360/50 system with our 2303 swap memory, if this article is
These two protocol recommendations that can be adopted will not only improve their own network performance, and to all nodes
Network performance improvement is helpful.
1. The host controls the order of IMP to host transmission
The Imp-Host protocol is now requested to send messages from IMP to the host in order to receive messages in accordance with IMP. This will be
The lower situation causes a waste of exchange, for example, when IMP has a message to send a total shared user A and
B, if b is residing in the kernel of the host, B will be forced to replace it, let A advanced
Into. As long as the first message is received, A will be removed and B will be stationed again. If the host can do the following
Two points: a) After reading the waiting message queue of IMP, b) receive information with the most effective way they discovery, then
Generate a new mechanism for improving network efficiency. Obviously, this transformation will have a certain impact on the IMP software of BBN.
2. Erlented to the kernel during the main unit
On the other level, may not include the Host-IMP protocol or the change of IMP software, you can use a Host-Host
(Main unit to the host) protocol, which collaborates with each other, is a specific program in the kernel to leave out
A certain period of time is transmitted to a multiplex file file in the auxiliary connection. This can greatly reduce such files from
A transfer time of the input and output in a swap restricted host. In the United States, it is when the figures are in a certain range.
This advantage that the proposal may result in weaken: If we assume that there is a 50kbps line, it can provide 100%
Band Width can give this transmission (this example may need to be slightly different to the RFNM), so every second is not
Less than 6 8KB messages, locked a kernel program and let it wait for more than two seconds or more
If this is the case, then this method can only be used for extremely limited file lengths of 2 to 16 messages.
Any range. Despite this, this proposal can make the speed of transmitting a big file so great, I think
It is still worth considering.
1. Abhi Bhushan, Proj. Mac 10. Jerry Cole, SDC
2. Steve crocker, ucla 11. John Kreznar, "
3. Ron STOUGHTON, UCSB 12. Dick Linde, "4. Elmer Shapiro, SRI 13. BOB Long,"
5. Steve Carr, Utah 14. Reg Martin, "
6. John Haefner, Rand 15. Hal Sackman, "
7. Paul Rovner, LL 16. C. Weissman, "
8. Bob Khan, BB & n 17. Marty Bleier, "
9. Larry Roberts, ARPA
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RFC 19 Two Protocol Suggestions to Reduce Congestion At Swap-Bound Nodes
Two protocol suggestions that can be used to reduce the blocking of limited exchange nodes
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