Markus,
As it happens there is a lot of discussion about stability issues with this NIC in recent[1] kernel versions right here on this list at the moment.
Participants in those discussions include Francois Romieu, Timo Teräs and others. See threads "r8169 mac reading/writing broken", "r8169: fix broken register writes", "r8169: enable 64-bit DMA by default for PCI Express devices".
[1]: more recent than I am using on that machine, which is 2.6.27 (Ubuntu 9.04).
Jan
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html