Date: Thu, 23 Sep 1999 14:03:30 -0500 From: "Alejandro Ramirez" <ales@megared.net.mx> To: "Carl Petersen" <petersen@aspi.net>, "Francis A. Vidal" <francis@usls.edu> Cc: "FreeBSD Questions" <freebsd-questions@FreeBSD.ORG> Subject: RE: xl0 transmission error: 90 Message-ID: <010001bf05f6$53948800$fba3f9cf@megared.net.mx> References: <Pine.LNX.4.10.9909231008290.4421-100000@atlas.usls.edu> <37EA59E6.49B3F44B@aspi.net>
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Hi,
Same here with xl0, but I have seen my new tx threshold been set to 360
bytes, it goes from 90 to 120 to 180 up to 360, and it stops in there.
How do I change the threshold default in the driver???.
Should I put 360 bytes default???
How bad its this for my system???
BTW My system its a Compaq Proliat 800 PPro 200 2 Nics 1 tl0 (built in
10mbps) and the other xl0(100mbps full-duplex).
Thanks
Ales
> "Francis A. Vidal" wrote:
> >
> > hi all,
> >
> > i get these messages from xl0 from time to time:
> >
> > xl0: transmission error: 90
> > xl0: tx underrun, increasing tx start threshold to 120 bytes
> >
> > what could be causing it? the NIC is a 3Com 3C905B-TP 10/100
auto-sensing
> > card attached to one of the 10/100 port of a 3Com SuperStack II Switch
> > 1100.
> >
>
> Tx under runs occur when the tx state machine cannot get packet
> data from memory fast enough to keep up with wire transmit
> rate. Setting the start threshold higher increases the number
> of bytes which are buffered in the tx fifo which increases the
> allowable bus latency.
>
> I suspect that some adapter in your machine is holding the bus
> for longer than it should.
>
> If the system runs fine after the new tx threshold has been set, see
> if you can change the threshold default in the driver and the errors
> should go away.
>
> --Carl Petersen
>
>
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