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Date:      Wed, 9 Aug 2006 19:19:17 +0200
From:      Stanislaw Halik <sthalik@tehran.lain.pl>
To:        freebsd-stable@freebsd.org
Subject:   Re: Network often not responding
Message-ID:  <20060809171917.GA32202@localhost.localdomain>
In-Reply-To: <44D9ECB9.5020500@goodforbusiness.co.uk>
References:  <496795293.20060809195310@pacific.net.id> <44D9ECB9.5020500@goodforbusiness.co.uk>

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On Wed, Aug 09, 2006, Dominic Marks wrote:
>> Aug  9 15:09:16 cache kernel: xl0: transmission error: 90
>> Aug  9 15:09:16 cache kernel: xl0: tx underrun, increasing tx start=20
>> threshold to 120 bytes

> dc%d: TX underrun -- increasing TX threshold  The device generated a
> transmit underrun error while attempting to DMA and transmit a packet.
> This happens if the host is not able to DMA the packet data into the
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> NIC's FIFO fast enough.  The driver will dynamically increase the
  ~~~~~~~~~~~~~~~~~~~~~~
> trans- mit start threshold so that more data must be DMAed into the
> FIFO before the NIC will start transmitting it onto the wire."

> So it would seem like the card cannot keep pace with the system. What NICs
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> have you tried?

Basing on the quoted text, isn't it the opposite?

--=20
I saw `cout' being shifted "Hello world" times to the left and stopped right
there. -- Steve Gonedes

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