Date: Tue, 5 Jun 2001 08:51:31 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: naddy@mips.inka.de (Christian Weisgerber) Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: 3Com 905-TX (was: Re: SCSI devices settling and illegal request) Message-ID: <15132.54739.586471.534822@grasshopper.cs.duke.edu> In-Reply-To: <9fihk9$26fc$1@kemoauc.mips.inka.de> References: <15132.765.786027.851646@grasshopper.cs.duke.edu> <20010604165948.A18399@arrakis.tamu.edu> <15132.9118.863339.708828@grasshopper.cs.duke.edu> <9fihk9$26fc$1@kemoauc.mips.inka.de>
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You might want to move this to -net. Its almost certainly not alpha specific. And to be sure about duplex, use netperf. If you have bad results with a TCP_STREAM and good results with a UDP_STREAM, then you have a duplex problem. Drew Christian Weisgerber writes: > Andrew Gallatin <gallatin@cs.duke.edu> wrote: > > > Yes. And, in fact, 3com (and intel etherexpress pro) cards are > > generally a better choice than tulip based nics because they can do > > byte-aligned DMA, > > This reminds me of an annoying problem I'm seeing here. > > OpenBSD 2.9/i386 (fxp) ------> Switch ------> FreeBSD 5.0/alpha (xl) > > 100 Mbit/s full duplex all the way. > > I'm seeing what must be significant package loss during bulk > transfers in this direction. The reverse direction works fine. > My main application where the problem becomes apparent is that I > run Opera on the i386 box and use the alpha as X Display. Opera > window updates slow to a crawl. It also affects bulk transfers > through ftp/rcp/rsh. Transfer rates collapse to a couple of kB/s. > Simple [rs]login text sessions don't suffer. The problem exists > after a reboot of the alpha, but seems to eventually disappear. > > This looks a whole lot like a full/half duplex problem, but both > hosts think that they're in full duplex mode and the switch agrees. > > I also have an OpenBSD 2.8/i386 (fxp) box there. It suffers the > same problem for bulk transfers to the alpha. All other combinations > between hosts work fine. > > FreeBSD-current from about May 14, PC164. > 3Com 3c905-TX Fast Etherlink XL. The card is fairly old, so I > assume it isn't a -B, -C, etc model. > > The problem could be newish, because I used to run backups from > other hosts to the alpha and that worked fine. > > -- > Christian "naddy" Weisgerber naddy@mips.inka.de > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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