[CentOS-virt] KVM - Network bridge issue - lots of overruns
sysadmin-aemnet at aemnet.it
Mon Sep 2 14:49:39 UTC 2013
I've a very big network problem with some server running CentOS with
KVM and some linux-like VMs on the top of it.
The vm's network is bridged with a physical dedicate NIC (an Intel
PRO/1000) with 2.4.14-NAPI driver (but the problem persists with various
versions of the driver) and the CentOS version is 6.4 (same problem with
a 5.7 sever) with all the last updates.
Randomly I get a lots of overruns on the vnet device on the physical
server ad obviously some packet were lost in the VM.
brctl show br1
bridge name bridge id STP enabled interfaces
br1 8000.002655e7590d no eth3
vnet1 Link encap:Ethernet HWaddr FE:54:00:BF:27:12
inet6 addr: fe80::fc54:ff:febf:2712/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:13358349859 errors:0 dropped:0 overruns:0 frame:0
TX packets:21831525660 errors:0 dropped:0 overruns:1746068
RX bytes:5080769358430 (4.6 TiB) TX bytes:16548002754111
As you can see there are a huge numbers of overruns also if the physical
NIC is dedicate solely to this VM and the network traffic is less than
The server is a quite new machine (HP DL120 G6) but I have the same
problem on an old DL360 G5 (but this is running about 10 vms).
What can I do to solve the problem?
My idea was to use the KVM passthrough functionality for the network
device, but this method isn't good for a server that runs more than 2
vms as my 360G5...
PS sorry for my bad english
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