RE: CDCether.c

[Michael Duane]

I have duplicated the problem with a stock Redhat 7.3
installation using a Toshiba PCX2200 cable modem connected
to standard PC hardware via USB

> -----Original Message-----
> From: Michael Duane 
> Sent: Thursday, September 19, 2002 8:23 AM
> To: Brad Hards; [e-mail]
> Subject: RE: CDCether.c
> 
> 
> 
> 
> > -----Original Message-----
> > From: Brad Hards [mailto:[e-mail]]
> > Sent: Wednesday, September 18, 2002 11:21 PM
> > To: Michael Duane; [e-mail]
> > Subject: Re: CDCether.c
> > 
> > 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > On Thu, 19 Sep 2002 09:49, Michael Duane wrote:
> > > Who is the maintainer of CDCEther.c?  I am having a problem
> > > with packets getting "wedged" somewhere on the way out
> > > and need to know if others have reported this problem.
> > Others have reported probems that normally look something 
> > like "it works fine 
> > for some minutes to days, and then all connectivity stops, 
> > till I reboot or 
> > re-insert the module", but I can't duplicate. Does this match 
> > your problem?
> 
> No, this is quite different. It appears to be a function of packet 
> size. ping -s <size> <host> will generate packet loss up to 100 
> percent with any size of (86+(64*n)).  All other values work fine.
> tcpdump on the linux side sees multiple packet retries with 
> correct back-off timeing, but the network side never sees the
> packet. Now for the odd part - any network activity on another
> session to the same box will free the "wedged" packet and the
> network will recieve the last packet sent in the linux retry
> sequence.
> 
> I don't know that it is in the CDCEther driver, but here are the
> combinations I have tried:
> 
>     linux -> usb -> cdcether -> broadcom modem -> network : FAILS
>     linux -> usb -> pegasus -> linksys adaptor -> 3com DOCSIS 
> -> network : OKAY
>     windows -> usb -> broadcom driver -> broadcom modem -> 
> network : OKAY
> 
> > 
> > > I'm running the 2.4.17 kernel and using a Broadcom DOCSIS
> > > modem based around a 3345.
> > Most people have reported the problem with Via UHCI chipsets, 
> > and usb-uhci 
> > driver. Does this match your configuration?
> 
> I'm using usb-uhci with an Intel 810e2.  I have tried the 2.4.19
> kernel with the same results. This is a proprietary hardware platform
> and I haven't been able to get the 2.5.36 kernel to boot yet.
> 
> > 
> > You might care to upgrade the kernel too.
> > 
> > Brad
> > 
> > - -- 
> > http://conf.linux.org.au. 22-25Jan2003. Perth, Australia. 
> > Birds in Black.
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> > 
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