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Old 12-09-2012, 04:18 AM   #1
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Registered: Dec 2012
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What's wrong with my network? ifconfig with lots of errors

Does anyone have an idea what might be wrong with my network? The output below is from my little server, Debian Squeeze, kernel 3.2.0-4-amd64. The network does have issues every second day, the server sometimes not responding to anything after boot. Only shutting it down and disconnecting mains will make it work again. NIC is an onboard Nvidia:

00:0a.0 Ethernet controller: NVIDIA Corporation MCP79 Ethernet (rev b1)

accessed by the forcedeth driver.

Today the server started rather fine and works OK. Seconds after booting this was the output of
ifconfig eth0
(note the RX line)

eth0 Link encap:Ethernet Hardware Adresse 00:01:2e:27:14:15
inet Adresse: Bcast: Maske:
inet6-Adresse: fe80::201:2eff:fe27:1415/64 Gültigkeitsbereich:Verbindung
inet6-Adresse: 2a01:198:2d2:0:1:2eff:fe27:1415/64 Gültigkeitsbereich:Global
RX packets:2243 errors:4506 dropped:0 overruns:0 frame:4506
TX packets:1551 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX bytes:335013 (327.1 KiB) TX bytes:724603 (707.6 KiB)

Since that point the errors didn't grow any further despite processing some 2 GB. I noticed this in /proc/interrupts:

22: 1961755 0 IO-APIC-fasteoi ohci_hcd:usb3, eth0

I already experimented with module settings of the forcedeth driver, to no avail. The settings don't seem to be applied in the first place.

Other days the overruns explode without network load. Am i having hardware issues? The box is connected to 8-port Cisco GBit switch. The installation is 2 weeks old, Debian Squeeze OOTB with a few network services installed and configured (isc-dhcp-server, bind9, radvd, nfs-kernel-server, lio-utils)

Dumping the old system 2 weeks ago and installing from scratch didn't help a bit. I was running a self- configured kernel then, but now it's debian default.

Any hints would be greatly appreciated.
Old 12-09-2012, 06:31 AM   #2
Registered: Aug 2009
Location: 2,625 m of paranoia above sea level
Distribution: Arch Linux, Debian GNU/Linux, Fedora, Void Linux, FreeBSD, OpenBSD and Win10 (sigh)
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Without seeing the dmesg output of your system (but don bother there are enough hints in the internet), it is a hardware problem and/or poor driver support problem that causes an interrup storm. Either way: disable the integrated NIC and use something different, an Intel NIC would be best, a supported Broadcom job (as in supported by the Tigon3 driver) second.
Old 12-12-2012, 02:59 PM   #3
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[ 1.834765] forcedeth: Reverse Engineered nForce ethernet driver. Version 0.64.
[ 1.835776] forcedeth 0000:00:0a.0: setting latency timer to 64
[ 1.902258] forcedeth 0000:00:0a.0: ifname eth0, PHY OUI 0x732 @ 3, addr 00:01:2e:27:14:15
[ 1.902268] forcedeth 0000:00:0a.0: highdma csum pwrctl gbit lnktim msi desc-v3 all dmesg says about my nic. Looks OK to me. I guess i'm in for a hardware purchase.
Thanks for thinking with me!


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