Re: Natsemi ethernet 'cable magic' fix can cause problems

From: Marcelo Tosatti (marcelo.tosatti_at_cyclades.com)
Date: 07/31/04

  • Next message: Marcelo Tosatti: "Re: [2.4 PATCH] problems with modular and nonmodular ide mix" 
    Date:	Sat, 31 Jul 2004 11:51:13 -0300
To: Tim Hockin <thockin@hockin.org>

    On Thu, May 13, 2004 at 10:03:58AM -0700, Tim Hockin wrote:
    > On Thu, May 13, 2004 at 11:35:03AM +0100, Colin Paton wrote:
    > > The problem was strange - about 30% packet loss was experienced during
    > > pings. Moving the box to a different ethernet wall outlet (but still
    > > using the same port on the switch) cured the problem. The problem
    > > therefore appeared to be cable dependant.
    > >
    > > It would appear that the call to 'do_cable_magic()' in
    > > drivers/net/natsemi.c causes the problem to occur.
    > >
    > > It looks as though this was added in to actually *fix* such problems...
    > > but in our case it made things worse.
    >
    > I'm the responsible party on that one. do_cable_magic() was a direct
    > result of a significant amount of work with National's engineers to
    > root-cause some major problems we had had.
    >
    > If I recall, the problem we experienced was when the cable was "short"
    > (where short was < 30m, I think). What can you tell me about your cabling
    > setup?
    >
    > Willing to test? Ping me back.

    Hi Tim, Collin,

    Did you made any progress on this issue?
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