Date: Wed, 14 Jan 1998 09:33:18 -0600 (CST) From: Mark Tinguely <tinguely@plains.NoDak.edu> To: mcwong@hotmail.com, questions@FreeBSD.ORG Subject: Re: ATM card for 2.2.5R Message-ID: <199801141533.JAA21968@plains.NoDak.edu>
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> Can someone recommend the right ATM adapter card for use in conjunction > with the HARP implementation ? the HARP directly supports the following cards: 1) Fore PCA-200E ATM PCI Adapters 2) Efficient Networks, Inc. ENI-155p ATM PCI Adapters I wrote the driver for: 3) IDT NICStAR (this is an evaluation board from IDT) see http://www.idt.com for NICStAR card information ftp://ftp.cs.ndsu.NoDak.edu/pub/freebsd/atm/... for driver > The main purpose is to do some traffic simulation from FreeBSD. Does > the HARP implementation give sufficient hooks or API to do certain > traffic shaping ? HARP itself is Classic IP over ATM. The ATM card drivers that come with HARP do not support Quality of Service. from looking at the code, I would say from my limited understanding of the HARP device drivers, they act as UBR. I wrote hooks for CBR, VBR into my NICStAR driver, but with the HARP stack these features are not being used. IDT SAR has three priority queues for VBR | ABR | UBR that we can define N/M values. If the highest priority queue does not have a cell to send then the next lower queue is checked. this is fine for UBR since it gets everything left over, but I am concerned about middle queue getting its minimum bandwidth. Since I bought the wrong media type for our ATM switch, my NICStAR driver was developed using a "NULL-SWITCH cable" (a twisted, twisted pair cable). I have not directly verified the IDT's SAR traffic shaping is conforming, but I have no doubts that it does put out only conforming packets for the specified N/M values I give it. I also had problems distinquishing some Payload Types (PT 4 is received as a PT 5 and PT 6 is received as a PT 7), so there may be a problem with ABR congestion control. > Is there a ATM related mailing list for FreeBSD ? yes, freebsd-atm@freebsd.org. To join or exit, send mail $ echo "[un]subscribe freebsd-atm" | mail majordomo@freebsd.org > > Thanks in advance. > > M.C Wong --mark.
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