Subject: Re: verrry slow ethernet
To: Jon Lindgren <jlindgren@espus.com>
From: None <cjc26@cornell.edu>
List: port-i386
Date: 01/02/2000 15:24:13
Ok, I did the tcpdump..what exactly should I be looking for?  The only 
unusual thing I see is that the packets are coming in groups of two, with 
a pause of about two minutes between each one.

Also, another weird symptom--I tried telnetting to this machine just now
from work, from two different machines, one running NT, the other
LinuxPPC.  Even though these two machines are on the same subnet, the
telnet session on the NT machine is extremely slow (it takes a couple
seconds for a keypress to be displayed), while the session on the Linux
box is much more responsive.  But, if I do "less dump.txt" in the NT
session, then the output from less is just as responsive as the Linux 
telnet session--i.e. when I press the spacebar, the next page of text is 
immediately displayed; it doesn't pause for a few seconds beforehand.  
But when I quit out of less, the session becomes slow again.  This makes 
me think that this can't be a hardware problem, or a router problem..
Does anyone know what the hell is going on?!? :)
TIA..


On Fri, 31 Dec 1999, Jon Lindgren wrote:

> First off I might suggest MTU discovery, however, you shouldn't get that
> far if MTU is the problem.  Might I suggest grabbing a quick tcpdump of
> the failing session (i.e. the ftp to ftp.gnu.org)?  That might
> help.  Although it might also be a hardware problem, and I can't help you
> on that one, sorry.
> 
> -Jon Lindgren
>  "Xyzzy!  You're a duck!"
>  jlindgren@espus.com, yubyub@yubyub.net
>  Livin' it up in Brooklyn for Y2K...
> 
> On Thu, 30 Dec 1999, Cliff Crawford wrote:
> 
> > Hello,
> > I have two ethernet cards, an ISA NE2000+ and a PCI RealTek 8029 (NE2000
> > compatible).  I'm running 1.4.1, and am connected via RoadRunner (i.e.
> > configured by dhcp).  I'm getting intermittent problems with either
> > one--basically some web and ftp sites will be extremely slow (like, 100
> > bytes a second) while others will load just fine.  For example, from
> > ftp.eecs.umich.edu I can get a transfer rate of about 80k/s, while
> > ftp.gnu.org frequently stalls out while downloading anything (if I can
> > get that far--it takes about ten minutes just to display the motd).  Also,
> > the POP server and news server which I usually use are on the same subnet,
> > but fetchmail takes something like five minutes to download three
> > messages, then times out, while I can read newsgroups just fine.  I know
> > this is a problem with my NetBSD setup and not with RoadRunner because
> > when I reboot the machine into FreeBSD everything works just fine.
> > 
> > I included the relevant output from dmesg and ifconfig below.  Does
> > anyone have any idea what's going wrong?
> > 
> > ne2 at pci0 dev 11 function 0: RealTek 8029 Ethernet
> > ne2: 10base2, 10baseT, 10baseT-FDX, auto, default auto
> > ne2: Ethernet address 52:54:00:ed:62:f5
> > ne2: interrupting at irq 11
> > 
> > ne1 at isa0 port 0x300-0x31f irq 10
> > ne1: NE2000 Ethernet
> > ne1: Ethernet address 00:80:29:ed:ec:30
> > 
> > ne2: flags=8822<BROADCAST,NOTRAILERS,SIMPLEX,MULTICAST> mtu 1500
> >         address: 52:54:00:ed:62:f5
> >         media: Ethernet autoselect (10base2)
> > ne1: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> >         address: 00:80:29:ed:ec:30
> >         media: Ethernet manual
> >         inet 24.24.11.7 netmask 0xffffff00 broadcast 24.24.11.255
> > 
> > 
> > -- 
> > cliff crawford   http://www.people.cornell.edu/pages/cjc26/
> > -><-             "You and your stupid orthography" -- Mark
> > 
> 
>