Problems with D-Link DFE-570TX

[Richard Dynes]

Jarlath Burke wrote:
> 
> Hi all,
> I have two machines using the D-link DFE-570TX quad-channel NIC with the
> Digital DS21143 Tulip chip on Redhat Linux 5.1 kernel 2.0.34 tulip driver
> 0.91.
> I configured the eth0 interface on each NIC and connected them using a
> crossover cable. When I run ttcp I get ~90Mbits/s performance but if I bring
> either of the configured interfaces down and up again, I get a major
> reduction in performance, typically ~25Mbits/s but sometimes as low as
> ~5Mbits/s.
> Has anyone seen this problem before?
> Is it some sort of autonegotiation bug and does the later releases of the
> tulip driver address this problem?
> 

run tulip-diag both pre and post, and post the results.  tulip-diag
(written by Donald) is on Donald's site.

Could this same someone explain how downing and upping an interface
could cause such an effect?  An autonegotiation bug would make sense
in that it obviously  affects speed, but it's the 'auto' part that
confuses me.

-Richard

-- 
    Richard Dynes
    rdynes@varcom.com