Cabletron Systems T2015 Przewodnik Instalacji Pobierz pdf (Strona 148)

138 Installation Guide for Clients

selectors (OS/2 only)

Specifies the number of internal data descriptors to allocate for global

descriptor table (GDT) selectors from OS/2.

GDT selectors are a precious resource in OS/2; if you allocate too

many, you decrease the performance of other programs and drivers.

The NetBEUI driver uses GDT selectors to copy data into user

buffers on RECEIVE, RECEIVE-ANY, and RECEIVE-ANY-ANY

NCB operations. Increase the value if many concurrent receive-type

NCBs are in progress, especially on an OS/2 server.

Plan on one GDT selector for each concurrent active session. If a

server has 100 sessions but only three are receiving at any given time,

specifying selectors=3 should be adequate.

sessions

Sets the maximum number of NetBIOS sessions that can be open at

one time. Each session uses approximately 300 bytes.

The NetBEUI driver uses a session each time it adds or finds a

NetBIOS name. Increase the sessions value if many ADD.NAME or

FIND.NAME requests occur simultaneously. If a request fails due to

lack of sessions, the driver returns an “interface busy” error.

stacksize (MS-DOS only)

Sets the size in bytes of NetBEUI’s internal stack.

Sets the retransmission-timer value in milliseconds for NetBIOS links.

This timer determines the delay before retransmitting a link-level

frame if no acknowledgment is received.

The three timer entries must obey the following mathematical

formula:

t2 < t1 < ti

Sets the delayed-acknowledgment timer value in milliseconds. This

timer determines the delay before acknowledging a received frame

when the receive window has not been reached.

Ordinarily, the receiver of NetBIOS message packets collects the

packets until the receive window (maxin) is full. The receiver then

sends an acknowledgment to the sender. Often, however, the sender

doesn’t send enough packets to fill the receive window and won’t

send any more until getting the acknowledgment signal. The t2 timer

sends that acknowledgment.

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Cabletron Systems T2015 Przewodnik Instalacji Strona 148