Date: Fri, 31 Oct 2003 11:09:56 -0500 From: Keith Mitchell <kmitch@guru.org> To: ant@hutchtel.net Cc: freebsd-net@freebsd.org Subject: Re: iMac and FreeBSD performance problems Message-ID: <3FA28954.7000705@guru.org> In-Reply-To: <3FA22FB5.12915.82C50B0@localhost> References: <20031031060117.GA77018@weenix.guru.org> <3FA22FB5.12915.82C50B0@localhost>
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Anthony Anderberg wrote: >>the iMac to a 10BT hub instead of the ethernet switch then everything >>seems to work fine as well. The iMac can talk to all the other equipment >>without a problem when its connected to the ethernet switch. Likewise >> >> > >Sounds like a duplex mis-match, which is especially >common with unmanaged switches. The problem >is that the computer and switch don't agree whether >their link is full duplex or half duplex. The result is >undetected collisions which must be retransmitted >via TCP timeouts instead of being retransmitted right >away by the NICs. I'd suggest setting the duplex on >the switch ports if possible and devices to see if a >combination works better, I'm not sure about the Mac >but you can get a list of media options on FreeBSD >using "ifconfig -m". > I have tried that but the switch seems retarded :-) I can't force the switch to do anything... If I force the computers to 100/half the switch leds indicate 100/full. And if I force the computer to 100/full the switch detects 100/half... argh. When I set the computers to autodetect then both the computers and the switch seem to agree on 100/full (based on the ifconfig info and the leds on the switch). And they seem to work unless I want the Mac and the freebsd machines to talk to each other. But... Something is definately wrong with the switch... Out of frustration I went out and picked up another ethernet switch from a different vendor (one of the new Nway ones that supports uplink detection too) and with that switch everything works as expected.... I had thought that I ruled out the switch since I tried two different ones with the same result (one was a 5 year old linksys 16 port switch and the other is about a year old mini 5 port linksys switch). Both were linksys switches though :-( The one I bought today that seems to work great is a netgear switch.... Hopefully its not all linksys switches since I was planning on getting one of the Linksys 8 port GE switches (I can get a really good deal on it). I guess i'll just have to try and see :-( What i'd really like would be to get a 10/100/1000 managed switch but they want way too much for them to justify one for a home network :-( Thanks. -- Keith Mitchell Email: kmitch@guru.org PGP key available upon request
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