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Date:      Thu, 10 Aug 2006 14:08:45 +0100
From:      Dominic Marks <dom@goodforbusiness.co.uk>
To:        freebsd-stable@freebsd.org
Subject:   Re: Network often not responding
Message-ID:  <44DB2FDD.60705@goodforbusiness.co.uk>
In-Reply-To: <20060809171917.GA32202@localhost.localdomain>
References:  <496795293.20060809195310@pacific.net.id>	<44D9ECB9.5020500@goodforbusiness.co.uk> <20060809171917.GA32202@localhost.localdomain>

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Stanislaw Halik wrote:
> 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 
>>> 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?
> 

Yep! I should read more than the first line on things, especially when 
quoting
them to others :)

Dom



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