When I run network backups, one of our FreeBSD machines (backup client) get NIC timeouts and warnings from the scsi driver:
Jun 3 14:50:12 melon /kernel: fxp0: device timeout
Jun 3 14:50:36 melon /kernel: fxp0: device timeout
Jun 3 14:51:03 melon /kernel: fxp0: device timeout
Jun 3 14:51:38 melon /kernel: fxp0: device timeout
Jun 3 14:52:41 melon /kernel: ahc0: Timedout SCB already complete. Interrupts may not be functioning.
Jun 3 14:53:12 melon /kernel: fxp0: device timeout
Both machines are on a hubbed 100 Mbit/s half duplex network. Looking at the traffic with netstat -d 1, I see that as soon as the traffic increases, there is a timeout and traffic stops, after with the net is reachable again. This goes on and on. It only happens when there is much traffic on both NIC and SCSI, it seems (alas when running backups...)
Since there was a second NIC, it tried connecting it to the server using that NIC through a switch, on a private network, but then the machine nearly crashed, or at least came to a grinding halt. It seems, as soon as I pulled the ethernet cable it came back. This happened without any backup running...
To me, this sounds like some odd interrupt problem? It is a PCI machine with an Intel ?x440 (if memory serves me right) and dual CPUs 400 Mhz, running freebsd-4.7p2.
Any ideas where to look, how to debug or what to do?
Thanks Palle
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