[CentOS] Ethernet poor performance

nate centos at linuxpowered.net
Wed Jul 2 17:46:17 UTC 2008

Robert Moskowitz wrote:

>> grep eth0 /etc/modprobe.conf
> Good card: alias eth0 e100
> Bad card: alias eth1 8139too
> 8139cp 0000:00:0e.0: Try the "8139too" driver instead.
> input: PC Speaker as /class/input/input2
> 8139too Fast Ethernet driver 0.9.27

There seems to be a conflict here, it seems as if a driver called
'8139cp' is being loaded before '8139too'.

One thing to try, shut down the network interfaces (/etc/init.d/network stop),
remove the 8139cp module and the 8139too modules:
rmmod 8139cp
rmmod 8139too

Re-insert the 8139too module:
modprobe 8139too

Start networking again:
/etc/init.d/networking start

Verify that the 8139cp driver is not loaded: lsmod | grep 8139cp

If 8139cp is loaded again try flat out moving the module out of
the /lib/modules/`uname -r`/ directory tree to another location,
and repeat the above.

and try your test again


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