Date: Tue, 28 Aug 2001 00:23:42 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: John Kozubik <john@kozubik.com> Cc: hackers@freebsd.org Subject: Re: multi-channel firewire host adaptors available ? Message-ID: <3B8B46FE.6829CB7E@mindspring.com> References: <Pine.BSF.4.21.0108271747180.798-100000@www.kozubik.com>
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John Kozubik wrote: > Has anyone seen multi-channel (up to eight) firewire PCI host adaptors ? > We require full 400Mb throughput on each channel, simultaneously. Interesting... 64bit PCI * 66Mhz = 4,429,185,024 bit/S = 4,244 Mbit/S = 528MB/S ...burst rate. Sustained rate is about half that, so the ballpark is: 2,122 Mbit/S = 264 MB/S. Assuming "400Mb" is "400Mbit", you will be at most able to process a total of 5 channels worth of data simultaneously. If that's "400MB", well, expect to get only 2/3 of a single channel, or burst, up to 1 1/3 channels... PS: The most I have seen on a single card is 2... -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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