> 
> Running a Dlink quad card (570TX) in 100Mb/s full dup mode the driver
> complains about underruns for awhile and then ultimately sets
> store_and_forward which seems to make it work. 
> 
> Is there a way to force this easily? It seems that it should certainly be
> the default if  full dup 100 mode is detected as the other settings fail
> quite easily on rather trivial activities.
> 
> should this card be used with the if_dc or if_de driver? Both seem to probe
> it successfully, although both drivers have the same (annoying) underrun
> problem (that wasnt a problem or at least not screen-verbalized in 3.4).

Transmit underrun is usually caused by another peripheral hogging the PCI 
bus; either a poorly configured card with an excessive latency value, or 
a misconfigured card (due to BIOS bugs), or a card that otherwise ignores 
the PCI latency rules, or a system with too many busy busmaster cards.

> Dennis
> Emerging Technologies, Inc.
> ----------------------------------------------------------------------------
> ---------
> 
> 
> 
> http://www.etinc.com
> ISA and PCI T1/T3/V35/HSSI Cards for FreeBSD and LINUX
> Multiport T1 and HSSI/T3 UNIX-based Routers
> Bandwidth Management Standalone Systems
> Bandwidth Management software for LINUX and FreeBSD
> 
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