5.2-RC oerrs and collisions on dc0

Dejan Lesjak dejan.lesjak at ijs.si
Sat Jan 3 20:14:56 PST 2004

On Sunday 04 of January 2004 03:23, Mike Silbersack wrote:
> On Tue, 30 Dec 2003, Dejan Lesjak wrote:
> > I'm glad to hear that reporting of errors might be false. So I setup some
> > monitoring of ports on both ends of cable, put apache on server with dc
> > card and made a cron job on another machine (on same switch) to fetch a
> > file of around 100MB every 5 minutes from server.
> > So things go thusly - on server side there is constant flow of output
> > errors and collisions with a peak at reboot. Collisions amount about 10%
> > of output errors, which about 0.1% of output traffic. On switch side
> > there is only a peak of input errors at server reboot, then there are no
> > more errors. I'm not entirely sure if I can make conclusions based on
> > this, but this can probably be false alarm then. Tell me if there is
> > something more that I can do to confirm that these are in fact false
> > collisions and errors. Also if seing graphs would help, they are on
> > http://niobe.ijs.si/ewok/
> >
> > Thanks everybody for help,
> > 	Dejan
> Hm, you may have a real problem.  I see 0 output errors here, although my
> collision count is constantly increasing.
> If you'd like to "fix" the false collisions, find the following line in
> if_dc.c, and remove it:
>                 ifp->if_collisions += (txstat & DC_TXSTAT_COLLCNT) >> 3;
> I say "fix" because that count used to be accurate, we apparently broke
> something somewhere else in the driver which is causing the false
> collision reports.  Of course, whatever is causing the false collisions
> may be causing false errors on your card, so it's hard to tell. :)
> Good luck,
> Mike "Silby" Silbersack

Hello again,
With this line commented out, I still get both errors and collisions, twice as 
much collisions as errors. On another occasion, I also added two printf lines 
in here:
                        if (txstat & DC_TXSTAT_EXCESSCOLL)
                        if (txstat & DC_TXSTAT_LATECOLL)
and I constantly get both of those, so this would be where counters go up if 
this helps in any way.


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