Slow Network with rl0 and 5.3

[Karl M. Joch]

hello,

after upgrading to 5.3 (cvsup) i have a lot of network problems with realtec
8139 cards. these cards worked fine with 4.x and 5.2.1. the network is
slowing down heavily without seeing any problems reports on console or
syslog (*.* logged). are there any known problems with these card and 5.3?
this happens on different servers updated since the last 2 weeks. 

many thanks,

karl