Date: Thu, 15 Jun 2000 14:50:53 -0400 From: "Sean O'Connell" <sean@stat.Duke.EDU> To: Dan Yergeau <yergeau@gloworm.Stanford.EDU> Cc: FreeBSD mobile <freebsd-mobile@FreeBSD.ORG> Subject: if_ed problems [was Re: Netgear ... sigh.] Message-ID: <20000615145053.U8955@stat.Duke.EDU> In-Reply-To: <200006140748.AAA18256@gloworm.Stanford.EDU>; from yergeau@gloworm.Stanford.EDU on Wed, Jun 14, 2000 at 12:48:44AM -0700 References: <20000614000817.C4496@stat.Duke.EDU> <200006140748.AAA18256@gloworm.Stanford.EDU>
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Dan Yergeau stated: > Sean O'Connell had written: [ much snippage] > >Even though I can get the Linksys 10/100 card to be probed and attached, > >I get absolutely abyssmal performance out of it (almost like a duplex > >mismatch and if_ed doesn't appear to support media/mediaopt settings) > >on a 10 (only) hub. > > > >scp'ing a good size file may take 25 or 30 seconds > >using an older card (eg. Linksys EC2T) but will take like 25 minutes > >using this newer card. Do you get decent performance out of your > >Linksys card? > > I've mostly had it attached to cheapo Netgear EN104 10BaseT hub > (private home network NAT'd to a PPPoE-based DSL connection). > Besides the DSL modem and the Linksys PCMPC100, the other NIC on the > hub is an old 3COM 3C595 Fast Etherlink III PCI, using the vx driver > (which only supports 10Mbps mode). I see about 700Kbps in either > direction between the Linksys PCMPC100 V2 and the Etherlink III, but > the collision light on the hub is lit solid during these transfers, > so something isn't working optimally. IIRC, I was seeing about > 1.1MBps when connected to a 100Mbps switch (1.5MBps is about the > limit of any 16-bit PCMCIA network card; to get more you need to go > with 32-bit CardBus, but I've gotten conflicting stories about the > extent of CardBus support in 4.0). > > BTW, not only doesn't if_ed not support media/mediaopt, but it also > doesn't seem to collect statistics (e.g. bytes, good packets, > collisions, and errors). Have a look at the output from "netstat -I > ed0 1". Note that although the vx does report bytes and packets > transferred in/out, it doesn't report any collision under the above > conditions. With a hub, it should be seeing the collisions. > > Given your performance, if_ed seems to dropping packets in such a > way that the dropped packets aren't being detected as collisions or > passed up the network stack (incomplete packets from an > underrun/overrun). The only advice I have is to add debugging code > to the driver to try to figure out why it is dropping packets, then > file a PR and/or post your findings to freebsd-mobile. Dan- [Note: I am cc'ing FreeBSD mobile ] I backed if_ed.c (still need the if (1) hack) and if_ed_pccard.c back to the 4.0-RELEASE code and suddenly, I am getting more reasonable performance (or at least reasonable performance :). I will try and see if it is one or the or both, but I just wanted to let folks know that something is pretty wrong with some post 4.0-RELEASE code at least as far as the Linksys 10/100 PCM100 (integrated PC Card) is concerned. Thanks S ----------------------------------------------------------------------- Sean O'Connell Email: sean@stat.Duke.EDU Institute of Statistics and Decision Sciences Phone: (919) 684-5419 Duke University Fax: (919) 684-8594 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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