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Date:      Wed, 28 Oct 1998 08:29:59 -0500 (EST)
From:      Bill Paul <wpaul@skynet.ctr.columbia.edu>
To:        dchapes@borderware.com (Dave Chapeskie)
Cc:        hackers@FreeBSD.ORG, netmonger@genesis.ispace.com
Subject:   Re: XL0
Message-ID:  <199810281330.IAA12402@skynet.ctr.columbia.edu>
In-Reply-To: <98Oct26.110114est.115594@gateway.borderware.com> from "Dave Chapeskie" at Oct 26, 98 10:44:05 am

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Of all the gin joints in all the towns in all the world, Dave Chapeskie 
had to walk into mine and say:

> On Thu, Oct 22, 1998 at 12:43:17PM -0400, Drew Baxter wrote:
> > Got my dmesg output for the day.. (this is probably my 2nd day of using my
> > XL card instead of a EP0'd 3c509), and i see this.. Anyone able to shed
> > some light on it?  It runs fine otherwise, not sure if this is killing
> > performance when we have this happen or not.
> > 
> > > xl0: transmission error: 82
> [repeats]

The latest version of the xl driver tries to avoid these by increasing
the transmit reclaim threshold. Note however that according to the
manual, these errors only appear with the 3c90xB adapters, not the
3c90x adapters. Consequently, the driver only fiddles with the reclaim
threshold if it detects that the adapter is a 3c90xB. This leads me to 
believe you have a 3c905B-TX instead of a 3c905-TX, although you didn't 
say so. If you do have a 3c900 or 3c905 and still see the error, then the 
3Com manual is lying to me.

Like the other mail says, these errors indicate that an error was
encountered after the chip had already started deleting the packet
from its internal memory. I only recently discovered the command to
change the transmit reclaim threshold. The change to increase the
threshold happened sometime last week.

-Bill

-- 
=============================================================================
-Bill Paul            (212) 854-6020 | System Manager, Master of Unix-Fu
Work:         wpaul@ctr.columbia.edu | Center for Telecommunications Research
Home:  wpaul@skynet.ctr.columbia.edu | Columbia University, New York City
=============================================================================
 "It is not I who am crazy; it is I who am mad!" - Ren Hoek, "Space Madness"
=============================================================================

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