Date: Tue, 14 Dec 1999 11:53:20 +0900 From: Kenjiro Cho <kjc@csl.sony.co.jp> To: ggm@dstc.edu.au Cc: freebsd-atm@FreeBSD.ORG Subject: Re: Bandwidth Capping fore ATM circuits? Message-ID: <19991214115320G.kjc@csl.sony.co.jp> In-Reply-To: <19673.945123962@dstc.edu.au> References: <6046.942985285@dstc.edu.au> <19673.945123962@dstc.edu.au>
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George Michaelson wrote: > Can somebody who knows the Fore card confirm if the microcode actually > does honour the free/data cells setting when passed in? > > the Linux code maintains state inside the driver and asserts > ENOBUF type errors back on write attempts if the queue of data exceeds > the rate assignment, so its not just using card-resident methods to > try and cap the cell usage. This is the reason why ALTQ doesn't work with HARP. Last time I looked at the HARP code, packets are passed through layers down to the driver and, if no buffer space is available, packets are just discarded. ALTQ requires that packets should be held in the queue until the driver becomes ready to accept the next packet. -Kenjiro To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-atm" in the body of the message
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