Date: Mon, 01 Sep 1997 19:13:37 +0900 From: Kenjiro Cho <kjc@csl.sony.co.jp> To: Yoshikazu Oda <oda@nal.ecl.net> Cc: P.Gevros@cs.ucl.ac.uk, salo@msc.edu, freebsd-atm@freebsd.org Subject: Re: Efficient ATM card. Message-ID: <199709011013.TAA19588@hotaka.csl.sony.co.jp> In-Reply-To: Your message of "Mon, 01 Sep 1997 18:21:03 JST." <199709010921.SAA01057@jamaica.nal.ecl.net>
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>> You can use only 1WORD-DMA for first generation pci chipsets. >> It is default setting on HARP version 2.1. (So, this version >> may work on old chipsets' machine.) It's good to know they are really broken. It seems to me that using a broken old pci chipset for ATM doesn't make sense since people want to use ATM for performance and there's no way to get good performance with those chipsets. >> I'm also looking for traffic shaping function for ATM card too. >> I know ENI card supports traffic shaping on its hardware (but no >> other cards support it). There are 8 channels for PCR timer (only >> PCR, so it can't support VBR service), and setting two parameters >> (Pr,Rate_Res) to specify PCR for each channel. But I don't know >> this may work fine. >> I'd like to know more about WRT's work for traffic shaping. >> Is it hardware shaping on ENI card or shaping with software or else? You're right about ENI's hardware shaper. It works pretty well. You might want to take a look at Werner Almesberger's Linux driver to know how to set these parameters. (BTW, software shaper won't help to get through the UPC.) --kj
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