[Soekris] eth0 warning in linux: "increased Tx theshold"

Jason R Thorpe thorpej at shagadelic.org
Wed Nov 6 19:18:16 UTC 2002


On Wed, Nov 06, 2002 at 08:12:11AM -0800, Jun Sun wrote:

 > I am running stock linux 2.4.19 on net4501.  I am connecting eth0 to
 > 100/10 hub (or switch).  I see the following warnings.  Does anybody
 > know what the cause is?  Is it harmful?
 > 
 > Jan 13 16:25:01 192 kernel: eth0: increased Tx theshold, txcfg 0x10f01004.      
 > Jan 13 16:25:01 192 kernel: eth0: increased Tx theshold, txcfg 0x10f01006.      
 > Jan 13 16:25:04 192 kernel: eth0: increased Tx theshold, txcfg 0x10f01008.      

It means that the PCI bus can't keep up with the Ethernet chip when
the Ethernet chip does overlapping DMA to increase performance.

It's well known that the SC520 used in the net4501 has a wimpy PCI bus.

-- 
        -- Jason R. Thorpe <thorpej at wasabisystems.com>



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