Date: Sat, 22 Aug 1998 16:17:21 +0200 From: Andre Oppermann <oppermann@pipeline.ch> To: Tom <tom@uniserve.com> Cc: Scott Michel <scottm@cs.ucla.edu>, freebsd-current@FreeBSD.ORG Subject: Re: Intel PRO/1000 Gigabit Adapter Message-ID: <35DED2F1.B646CAA3@pipeline.ch> References: <Pine.BSF.3.96.980821204259.10110C-100000@shell.uniserve.ca>
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Tom wrote: > > On Fri, 21 Aug 1998, Scott Michel wrote: > > > [slightly off topic] > > > > Ewwwwwwwww! Friends never let friends build networks with ATM unless > > absolutely necessary and even then ... It'd be like perpetrating an > > MS Operating system on someone. If the network can't support mcast > > naturally, should we really be using it? > > More important to me, is the ATM overhead of 10 to 15%. On a 155mbs OC3 > link, 10 to 20mbs is wasted! You can justify ATM overhead for mixed > applications, but if you just want to push IP traffic around, you'd better > off using clear channel routed links. I thought it was even more, 20%-30%. What really sucks on ATM is when the link gets saturated, then ATM begins to drop random cells and kills whole IP packets. If that happens you're lost. 1% cell loss on ATM can give 30% packet loss on IP (it depends on traffic pattern, packet size, etc.). > > The good news is that ATM is being relegated to the dust heap of > > history now that PPP/Packet over Sonet is operational. All we need > > now is operational PCI bus cards. > > Yep. I wonder if AGP slots can be used for non-video applications? AGP > has about 4 times the bandwidth of PCI. Of course, you can only have > on such adapter. Even PCI should be enough for two or three cards (155Mbit/s are 19MByte/s and PCI can do 130MByte/s, at least on paper). The problem with APG is that there is only one slot allowed... -- Andre To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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