Date: Fri, 17 Dec 1999 08:25:55 -0800 (PST) From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> To: dillon@apollo.backplane.com (Matthew Dillon) Cc: gallatin@cs.duke.edu (Andrew Gallatin), toasty@dragondata.com (Kevin Day), phk@critter.freebsd.dk (Poul-Henning Kamp), freebsd-current@FreeBSD.ORG Subject: Re: Serious server-side NFS problem Message-ID: <199912171625.IAA29545@gndrsh.dnsmgr.net> In-Reply-To: <199912170328.TAA57721@apollo.backplane.com> from Matthew Dillon at "Dec 16, 1999 07:28:34 pm"
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... > (200-300 MHz) clients. That's *with* packet loss (for some reason when > my fxp ethernets pump data out that quickly they tend to cause packet > loss in other parts of my HUBed network, which I find quite annoying). Interesting you should say that.... I've been playing with some broadcom based ASIC 100BaseTX full duplex switches and I actually loose more packets due to overrunning the buffers in the switch than I do if I used a half duplex standard hub. :-( Performance for most things overall on the network is better with the switch, but direct high bandwidth traffic between 2 machines has suffered due to the conversion to a fully switched network. Seems FreeBSD (using dc21143 based cards) can pump data around so damn fast that the switch can't keep up :-(. I need to do some more testing to find out if this occurs between ports on the same ASIC or only when packets have to go out to the ASIC to ASIC bridge bus. Also how do the fxp and dc based cards respond to flow control? Do we obey it? Do the cards even understand it? -- Rod Grimes - KD7CAX @ CN85sl - (RWG25) rgrimes@gndrsh.dnsmgr.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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