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Data transfer rates (Rand/UCLA) (RFC0227)

IP.com Disclosure Number: IPCOM000002830D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2019-Feb-13
Document File: 2 page(s) / 3K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J.F. Heafner: AUTHOR [+1]

Related Documents

10.17487/RFC0227: DOI

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 86% of the total text.

Network Working Group J. Heafner Request for Comments: 227 E. Harslem NIC: 7631 September 17, 1971 Updates: RFC 113

DATA TRANSFER RATES (RAND/UCLA)

The attached memo indicates data rates typical of our use of RJS at UCLA CCN. Earlier timing tests (similar but more detailed) with UCSB showed that most of the time was lost because of: (1) channel contention with our disk drive access; (2) our NCP runs at a higher priority than batch jobs but lower than text editing and interactive graphics; (3) OS interrupt handling is very slow on both ends; (4) spooling time of the remote system.

MEMORANDUM

TO: John Heafner FROM: Bob Hoffman COPIES: Bob Mobley, Herb Shukiar

Here are some of the transmission rates I have noted over the network between Rand and UCLA. These were all taken at night when little else was happening on our 65.

SEND TO UCLA

# Cards Blocksize (bytes) Time (secs) Rate (bits/secs) 642 80 50 8218 375 80 30 8000 509 800 20 16288

RECEIVE FROM UCLA

For all figures below, the receiving file has blocksize of 1330 bytes, and each line is assumed to contain 100 bytes. This last assumption is fairly accurate, since most of the lines were from PL/I for which this is a very good number. Thus, for each rate, the number of bytes is the # Lines * 100.

# Lines Time (secs) Rate (bits/secs) 4900 200 19600 872 47 14843 3900 185 16865

Heafner & Harslem [Page 1]

RFC 227 DATA TRANSFER RATES (RAND/UCLA) September 1971

As you can see from the send figures, blocking makes about a 2:1 differenc...

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