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Eicon Connections for Linux User’s Guide

page 53

CHAPTER 6

Advanced Eiconcard Services Configuration

This section describes the advanced Eiconcard Services Configuration.

Eiconcard Device Driver Parameters

Total Request Buffers Allocated

The Total Request Buffers Allocated parameter defines the number of request buffers to be

allocated for the Eiconcard Streams Device Driver. Request buffers are used to transfer

commands between the Eiconcard Driver and the Eiconcard.

By default, the Eiconcard Streams Device Driver has a total of 1024 request buffers enabled.

Each request buffer requires 20 bytes. Once allocated, the memory configured for the

Eiconcard Streams Device Driver is never returned to the system. Approximately 2560 bytes

of memory is reserved for 128 request buffers. The value you should configure for this

parameter depends on:

• The number of simultaneous sessions on the Eiconcard.

• System memory available.

• The volume of traffic on the Eiconcard.

• How many Eiconcards are installed in the system.

In high-stress environments (for example, when you also have Eiconcard Routing Services

running on your system), it may be appropriate to configure additional request buffers per

Eiconcard, provided you have sufficient memory in your system.

For Eiconcard Connections for Linux, the number of request buffers configured for the

Eiconcard Streams Device Driver is automatically increased during the configuration of the

Host PAD and Terminal PAD drivers.

Total Data Buffers Allocated

By default, 1024 data buffers are reserved for the Eiconcard Character-Compatibility Driver.

If you modify this value, make sure that the value you specify is greater than or equal to the

number of request buffers. The Eiconcard Character-Compatibility Driver reserves 256 bytes

per buffer at initialization.

Given that the data buffers are reserved for the Eiconcard Character-Compatibility Driver, you

may want to specify a lower value if, for example, you are not using the Development Tools

and are using less than 32 Host PAD devices. The Eiconcard Host PAD driver may also add

buffers to the value specified for the Eiconcard Character-Compatibility Driver. Therefore, the

total number of reserved data buffers may be larger than the value previously configured for

this driver.

Note: Data buffers are also used by X.25 Development Tools requests. For example, with an

X.25 application, an x25send( ) or x25recv( ) that uses a 4K buffer to send or receive data

requires 16 data buffers; 4096 bytes (16 x 256) are used in this case.

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Eicon Networks S52 Guía de usuario Pagina 55