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.\" $FreeBSD: release/9.1.0/share/man/man4/idt.4 130650 2004-06-17 19:51:17Z ru $ .\" .Dd June 3, 2003 .Dt IDT 4 .Os .Sh NAME .Nm idt .Nd device driver for IDT NICStAR-based ATM interfaces .Sh SYNOPSIS .Cd "device idt" .Cd "device atm" .Sh DESCRIPTION The .Nm device driver supports ATM network interfaces based on the IDT NICStAR 77211 controller, including the FORE Systems ForeRunner LE25 and LE155. For configuring the card for IP see .Xr natmip 4 . .Pp ATM CBR connections are supported, and bandwidth is allocated 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. .Pp The following sysctls are recognized by the driver: .Bl -tag -width indent .It Va hw.idt.log_bufstat Print statistics about buffer use to the system log periodically. .It Va hw.idt.log_vcs Print information about VC opens, closes, and other events to the system log. .It Va hw.idt.bufs_large Set or print the maximum size of the 2KB buffer queue. .It Va hw.idt.bufs_small Set or print the maximum size of the mbuf queue. .It Va hw.idt.cur_large Print the current size of the 2KB buffer queue. .It Va hw.idt.cur_small Print the current size of the mbuf queue. .It Va hw.idt.qptr_hold Optimize the TX queue buffer for lowest overhead. .El .Sh SEE ALSO .Xr natm 4 , .Xr natmip 4 , .Xr ifconfig 8 , .Xr route 8 .Sh AUTHORS .An -nosplit .An Richard Hodges , based on the original driver for .Fx 2.2 by .An Mark Tinguely . .An Bruce M. Simpson wrote this manual page and backported the driver to .Fx 4.9 .