kernel: too much work at interrupt !?

Hi Gurus ... I am having trouble with a PII running SuSE Pro 7.2 with basically nothing to do except some basic routing (iproute2), packet filtering (iptables), adsl (pppoe) and tunneling (vtund). Kernel logs the following message: kernel: eth0: Too much work at interrupt, IntrStatus=0x040. As a consequence, my tunnels (2 tunnels, one through pppoed and the other one through an external router) drop, then reconnect. Annoying. Anybody a clue about what and where to look for ? Olivier. PS: - NIC=8139too (there are 3 of them) - pppoed is from the distribution