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Date: Mon, 27 Oct 1997 09:12:35 -0500
From: Charles Henrich <henrich@crh.cl.msu.edu>
To: Don Lewis <Don.Lewis@tsc.tdk.com>
Cc: Matt Thomas <matt@3am-software.com>, Jaye Mathisen <mrcpu@cdsnet.net>,
        freebsd-hackers@FreeBSD.ORG
Subject: Re: de0 errors
References: <matt@3am-software.com> <199710271233.EAA22692@salsa.gv.tsc.tdk.com>
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In-Reply-To: <199710271233.EAA22692@salsa.gv.tsc.tdk.com>; from Don Lewis on Mon, Oct 27, 1997 at 04:33:51AM -0800
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On the subject of Re: de0 errors, Don Lewis stated:

> On Oct 23,  7:51am, Matt Thomas wrote:
> } Subject: Re: de0 errors
> } At 12:57 AM 10/23/97 -0400, Charles Henrich wrote:
> } >After moving to 2.2.5-RELEASE im seeing:
> } >
> } >Oct 23 00:32:12 msunews /kernel: ccd0-3: Concatenated disk drivers
> } >Oct 23 00:35:45 msunews /kernel: de0: abnormal interrupt: transmit underflow
> } >(raising TX threshold to 96|256)
> } >Oct 23 00:36:01 msunews /kernel: de0: abnormal interrupt: transmit underflow
> } >(raising TX threshold to 8|512)
> } >Oct 23 00:37:41 msunews /kernel: de0: abnormal interrupt: transmit underflow
> } >(raising TX threshold to 1024)
> } >Oct 23 00:55:14 msunews /kernel: de0: abnormal interrupt: transmit underflow
> } >(switching to store-and-forward mode)
> } >
> } >Any ideas?  Are these informational, or are they bad?
> } 
> } they are informational.
> 
> In the sense that everything is working, but if you're seeing transmit
> underflows even when the TX threshold has been set to 1024, then I suspect
> you'll have a real problem getting anywhere near full performance out
> of the card.

Can you suggest any debugging tips for isolating and fixing this problem?

Just using FTP between two hosts on the 100mbit net I see 2-3MB/sec and
receive at about half that.  However this system is also a very busy news
server.  I wish FreeBSD had a top or systat function that showed network
traffic in K/Sec.

-Crh

       Charles Henrich     Michigan State University     henrich@msu.edu

                         http://pilot.msu.edu/~henrich