idt(4)

NAME

idt - device driver for IDT NICStAR-based ATM interfaces

device idt
device atm

The idt device driver supports ATM network interfaces based
on the IDT NICStAR 77211 controller, including the FORE Systems Fore
Runner LE25 and LE155. For configuring the card for IP see natmip(4).
ATM CBR connections are supported, and bandwidth is allocat
ed in slots of 64k each. Three VBR queues handle traffic for VBR and UBR.
Two UBR queues prioritize UBR traffic. ILMI and signalling get the
higher priority queue, as well as UBR traffic that specifies a peak cell
rate. All other UBR traffic goes into the lower queue.
The following sysctls are recognized by the driver:
hw.idt.log_bufstat: Print statistics about buffer use to the system log; periodically.
hw.idt.log_vcs: Print information about VC opens, closes, and other; events to the
system log.
hw.idt.bufs_large: Set or print the maximum size of the 2KB buffer; queue.
hw.idt.bufs_small: Set or print the maximum size of the mbuf queue.
hw.idt.cur_large: Print the current size of the 2KB buffer queue.
hw.idt.cur_small: Print the current size of the mbuf queue.
hw.idt.qptr_hold: Optimize the TX queue buffer for lowest overhead.