Installation guide

Chapter 9 Network Device Driver Options 267
irq_level
Indicates the interrupt level of the network adapter. This entry must
match the adapter’s jumper settings. The entry is ignored if
adaptertype is NIUps.
On XT-class computers, interrupt level 5 is used by the hard disk
controller. If you are running the ubnei$ driver on an XT-class
computer, you will need to change the irq_level from the default (5)
and the jumper setting on the board.
maxmulticast
Sets the maximum number of multicast addresses. This entry
configures the size of the multicast address table.
maxrequests
Specifies the number of request-queue entries.
maxtransmits
Specifies the number of transmit-queue entries.
memorywindow
Specifies the physical base address of the window through which the
network device driver accesses the network adapter’s RAM. This
entry must match the adapter’s jumper settings. The entry is ignored if
adaptertype is NIUps.
receivebuffers
If receivemethod is set to ReceiveChain, HostBuffered, this entry
specifies the number of receive-buffer queue entries.
receivebufsize
If receivemethod is set to ReceiveChain, HostBuffered, this entry
specifies the size, in bytes, of each receive buffer. This entry must
contain an even value.
Note Ungermann-Bass network adapters cannot be installed on
80486 EISA computers.
receivemethod
Maximizes the network device driver’s performance. With most
protocol drivers, this entry’s default value of ReceiveLookahead
provides maximum performance. However, some protocol drivers can
achieve slightly better performance with one of the two other values.
This entry can be set to one of the three following values:
ReceiveLookahead
Tells the network device driver to send a small part of the frame to
the protocol driver as “lookahead” data. This way, the protocol
driver does not have to copy whole frames that aren’t needed.
ReceiveChain, AdapterBuffered
Tells the network device driver to hold frames briefly in the
network adapter’s buffers until the protocol driver can copy them.