Date: Thu, 12 Feb 1998 00:34:51 -0600 From: "Joe" <joe@thebestisp.com> To: <freebsd-isp@FreeBSD.ORG> Subject: Re: Fw: FreeBSD firewall questions Message-ID: <01bd3780$52b0c520$b221dccc@subzero.thebestisp.com>
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well you should try some big transfers ie: 100+megs and see that you will not get any better than maybe 75% even with a high end hub like intels or baystack even there the latency alone would be severly higher that a dcd and you would surelly get more collissions than with a dcd.. and the $40-$60 hubs that SMC/Linksys/etc put out I would be suprised if you get better that 5Mbps but through a switch sure you will push near 10 and with dcd even a POS nic card will get you by at near cap. I do use all intel pro100b nic's and through our local switched network I get solid 90+Mbps throughput. but not through the hubs even the managed baystack that we put out in larger networks only gets 65-70Mbps on a 100Mbps hub and that is due to collisions and the backdown time and latency in general. And some of the baystack 10Mbps push 80% but no better. At any rate take a look at your hubs how many of the that have util. meters go over 60-70%?? and call and ask the manufacturer "What is the best util. I will get?" ask about a 10Mbps because they will want to sell you a 100Mbps.. :-) -----Original Message----- From: Jim Shankland <jas@flyingfox.com> To: joe@thebestisp.com <joe@thebestisp.com> Cc: freebsd-isp@freebsd.org <freebsd-isp@freebsd.org> Date: Thursday, February 12, 1998 1:14 AM Subject: Re: Fw: FreeBSD firewall questions > And second [with a hub] you can't expect to get better that 60%(+-) > ie: 6Mbps rather than 10Mbps throughput so you are paying for latency > and collissions.. Woops. Crap detector just went off. You should actually try this out; do your two hosts that get 10 Mb/s throughput on a point-to-point cable get 6 Mb/s throughput when those two hosts (only) are connected through a hub? If so, throw the hub into the trashcan and get another. You're right, though, that a hub is unnecessary to connect two hosts point-to-point. And if the interface cards support it, you can run the point-to-point line in full-duplex; for that matter, with 10/100 cards running $60 or less, at 100 Mb/s. 100 Mb hub and switch prices are dropping fast, but they're not yet down to a trivial level. Jim Shankland Flying Fox Computer Systems, Inc. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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