Re: [opensuse] How to fix network interface overruns?
- From: Hans Witvliet <suse@xxxxxxxxxxx>
- Date: Sun, 01 Apr 2012 22:10:46 +0200
On Sun, 2012-04-01 at 18:58 +0200, Per Jessen wrote:
I'm testing a new fibre connection at 50/10Mbit, and the network
interface card is showing an increasing number of overruns when
I "stress" the link with a lengthy download from a high-speed source. In
the last 4Gb download, I saw the counter increase by at least 10000.
Googling has informed me that "Receive overruns means that packets are
arriving faster than you can receive". The firewall to which the fibre
is connected is an elderly PIII 800MHz, but I can't quite imagine that
causing this issue. It has four network interfaces:
02:04.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 24)
02:08.0 Ethernet controller: Intel Corporation 82801BA/BAM/CA/CAM Ethernet Controller (rev 01)
02:09.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 24)
02:0a.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 74)
on separate interrupts: (from /proc/interrupts)
16: 15819304 IO-APIC-fasteoi eth2
18: 13879018 IO-APIC-fasteoi eth3
20: 73917 IO-APIC-fasteoi eth0
21: 1667206 IO-APIC-fasteoi eth1
The problematic interface is eth3, a 3Com 3c905b. I'm contemplating
replacing it with a newer intel e100 card, but I'm grasping
at straws. Any other suggestions for troubleshooting this?
Hi,
Replacing it with a different nic might do the trick.
John already suggeted a Gb-nic, but it's not the speed that might do the
trick for you, modern nics (capable of realy doing Gb) often have longer
hareware fifo's onboard, and generate less IRQ's for the same amount of
data, compared with 3com's.
Might consider a single Intel board with quad E1000 if irq's or the bus
is a problem.
hw
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