Network connection of KVM is unstable on SLES11/openSUSE11.1
Hi all,
I tried to build the VM with qemu-kvm on SLES11/opensuse11.1 on x86-64.
The network device was TAP with bridge.
==============
linux-gwsa:/srv/ovs/images # uname -a
Linux linux-gwsa 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64 x86_64 x86_64 GNU/Linux
linux-gwsa:/srv/ovs/images # rpm -qa | grep kvm
kvm-78-13.8
kvm-kmp-default-78_2.6.27.19_5-13.8
linux-gwsa:/srv/ovs/images # lsmod | grep kvm
kvm_intel 49104 1
kvm 172488 1 kvm_intel
linux-gwsa:/srv/ovs/images # brctl show
bridge name bridge id STP enabled interfaces
br0 8000.001a644887b6 no eth0
linux-gwsa:/srv/ovs/images # ifconfig br0
br0 Link encap:Ethernet HWaddr 00:1A:64:48:87:B6
inet addr:192.168.0.13 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21a:64ff:fe48:87b6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:359030 errors:0 dropped:0 overruns:0 frame:0
TX packets:4386 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:74380332 (70.9 Mb) TX bytes:4912255 (4.6 Mb)
linux-gwsa:/srv/ovs/images # cat /etc/qemu-ifup
#!/bin/sh
echo 'config qemu network with bridge for ' $*
bridge=br0
# Exit if $bridge is not a bridge. Exit with 0 status
# so qemu-dm process is not terminated. No networking in
# vm is bad but not catastrophic. The vm could still run
# cpu and disk IO workloads.
# Include an useful error message in qemu-dm log file.
if [ ! -e "/sys/class/net/${bridge}/bridge" ]
then
echo "WARNING! ${bridge} is not a bridge. qemu-ifup exiting. VM may not have a functioning networking stack."
exit 0
fi
ifconfig $1 0.0.0.0 up
brctl addif $bridge $1 || true
===================
I booted the KVM with
# qemu-kvm -m 8192 -smp 4 -hda /dev/sdb1 -net nic -net tap
In the VM, the network worked well by "ping". When I copied a huge file (2G) from other machine, the max speed was 300kB/s and disconnected after server seconds.
However, after made the eth0 down and up, the connection was ok again. It would failed when copying big file again.
Did it the KVM on SLES problem? Did anyone hit it also?
I check the network device on 1000MB/s connection:
use rtl8029 (default device) on SLES10SP2, max 300kB/s , unstable
use e1000 in SLES10SP2, max 5.6mB/s, stable
use virtio on SLES11, max 11kB/s, stable
I need an explict advice how to configure a bridge for a SUSE host to serve as bridge for Virtual machines under -smp 8 -m 2048 -net nic -net tap
this host . Later on I will start the VM using the following
command : qemu-system-x86_64 -hda
The problem: From SUSE man pages it is not clear if I should set a separate ifcfg-br0 file with the basic bridge info or add this basic bridge info to the existing (non bridge) ifcfg-eth-id- file for eth0 . I tried both , then restarted the network on the host and the system stuck in these cases . So I am missing something .
Can anyone help
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