Bull DPX/20 Installation And Configuration Manual - page 29

3-9

Software Installation

SBA_Category This attribute defines the session ID of the SBA_Category for the static

allocation. The value range is 0 ...65535. The default value is 0. If a value

outside the limits is specified, the upper/lower limit will be taken.

Note: This attribute only has an effect if the attribute SBA_Payload has a

value greater than 0

Sync_Tx_Mode

This attribute defines the synchronous transmission mode. The default

value is ’SPLIT’, where only frames identified as synchronous frames are

transmitted by the synchronous queue. The alternative value is ’ALL’, where

all LLC frames received from upper layers are transmitted via the

synchronous queue.

Note: This attribute only has an effect if the ESS is able to allocate the

required synchronous bandwidth from the SBA.

SBA_Command

This attribute is an SBA local action to start or stop the SBA application.

Values may be ’START’ or ’STOP’. The default value is ’STOP’.

Note: There should be only one active SBA application in the same

segment.

SBA_Available

This attribute defines the maximum synchronous bandwidth in percent

available for the primary path. The value range is 0...100 percent. The

default value is 50 percent (6.25 MBytes/s). If a value outside the limits is

specified, the upper/lower limit will be taken.

Note: This value remains zero until the SBA application is enabled and

active.

Extended receive mbuf size

Extended receive mbuf size: this parameter defines the type of mbuf

allocation.If you specify ‘yes‘ the receive mbufs will be allocated with a

single cluster of more than 4 Kbyte size. Since the driver must preallocate a

number of receive buffers typically 8 Kbyte mbufs will be allocated for each

receive buffer. This can increase performance but will also consume mbufs

of the contiguos memory pool. Due to the limited number of large mbufs the

system may run out of mbufs. If you specify ‘no‘ default allocation will be

used.  his means that receive frames are allocated as a chain of two 4 Kyte

mbufs. This can decrease the receive performance but avoids that the

system runs out of resources. 

Please see also the ’Receive frame count’ parameter.”

Receive frame count

This parameter defines the number of receive buffers that will be allocated

by the driver for receive operation. When the driver is initialized  it will

preallocate up to the given number of receive buffers. Also it will refill the

receive buffer ring during receive operation. Depending on the receive mbuf

size you can decrease or increase the amount of memory that is held in the

driver‘s receive queue. 

Please see also the ‘Extended receive mbuf size‘ parameter.”

Apply change to DATABASE only

Indicates whether or not the configuration changes being made should be

applied only to the database or to both the database and the current device

operation. For devices that are in use and cannot be changed this allows

the database to be changed for the device so that the changes take effect

the next time the system is rebooted. Possible values: ’yes’ or ’no’,