Date: Mon, 10 May 1999 11:37:57 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Pedro J. Lobo" <pjlobo@euitt.upm.es> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: What is a "transmit underflow"? Message-ID: <199905101837.LAA69281@apollo.backplane.com> References: <Pine.OSF.4.05.9905101216130.16505-100000@haddock.euitt.upm.es>
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:Hi, all.
:
:I've got two FreeBSD boxes (3.1-R) working as routers, one with two 4-port
:ZNYX 10/100 ethernet cards and the other with one of those cards. The
:cards have DEC chips (21140A).
:
:The routers are working perfectly, but from time to time I get the
:following messages:
:
:de0: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
:de1: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
:
:What do they mean? Everything seems to be OK, but I'd like to know wether
:I have to worry about this or not.
:
:TIA,
:
: Pedro.
:
:Pedro José Lobo Perea Tel: +34 91 336 78 19
Don't worry about it, it happens with most tulip-based cards. The cards
seem to have a hard time staging DMA but the device driver takes care
of it. We have some machines that bump it all the way up to 1024.
de0: enabling 100baseTX port
de0: enabling Full Duplex 100baseTX port
...
de0: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
...
de0: abnormal interrupt: transmit underflow (raising TX threshold to 8|512)
...
de0: abnormal interrupt: transmit underflow (raising TX threshold to 1024)
-Matt
Matthew Dillon
<dillon@backplane.com>
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