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TIP Message Buffers (RFC0297)

IP.com Disclosure Number: IPCOM000003493D
Original Publication Date: 1972-Jan-31
Included in the Prior Art Database: 2000-Sep-13
Document File: 2 page(s) / 3K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D.C. Walden: AUTHOR

Abstract

We have recently heard some groaning about the size of the TIP's message buffers. While we realize these aren't as big as some Hosts might desire, they aren't as small as the intensity of the groans suggest either.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 81% of the total text.

NETWORK WORKING GROUP Dave Walden

REQUEST COMMENTS #297 BBN

NIC #8485 1/31/72

Categories: C or maybe D

Updates: none

Obsoletes: none

TIP Message Buffers

We have recently heard some groaning about the size of the TIP's

message buffers. While we realize these aren't as big as some Hosts

might desire, they aren't as small as the intensity of the groans

suggest either.

Let's first consider messages going from a TIP to another Host.

The buffers have the following sizes:

device numbers buffer size (in 8 bit characters)

1-2 64

3-16 32

17-41 16

42-62 8

63 6

The TIP user has the option of having his messages sent 1) every

character, 2) on line feeds and/or com's, 3) every nth character, or

4) the OR of 2) and 3). Selecting to have messages sent every large

number of characters, say 100, will result in the TIP sending the

longest messages it can for a given device. Hosts which don't like to

receive very short messages might advise users accessing them from a

TIP to set the TIP's parameters to use the maximum length buffer.

Now let's consider messages going from another Host to a TIP.

The buffers have the following sizes:

device numbers buffer size (in 8 bit characters)

1 96

2 64

3 48

4-17 24

18-35 16

36-63 8

The TIP double buffers its terminal output. Thus, when a TIP terminal

makes a connection to a Host, the TIP sends off an allocation of

between 8 and 96 characters, depending on the terminals device number,

and when a message comes using up the allocation, the TIP immediately

sends another allocation for the same number of characters while it

prints the first buffer.

For traffic both to and from the TIP, lower numbered devices have

bigger buffers. Therefore, users of line oriented systems, as well as

users of higher speed devices, should try to come in through the lower

numbered ports on the TIP's multi-line controller, if possible.

The sizes of the TIP's message buffers and the number of each

size are not permanently fixed and can be changed if a better

distribution is suggested. We didn't know what size buffers to

provide so we have provided a variety, What is fairly fixed is the

total amount of buffer space: two output buffers and one ...