Slow network for windows hosts, can't figure it out.
I have 3 hosts running as virtual machines on top of KVM, default updated versions of everything for Ubuntu Oneiric.
On the virtual machine running Debian iperf shows between 1.5 and 2Gbps between the guest and the host, the two Windows machines (2008 standard and 2011 sbs) shows between 70 and 80Mbps, half that again if running from windows guest to windows guest.
All network cards are virtio, the cpu-usage is not rising overly much, and the disks are not the bottleneck.
I've downloaded the latest signed drivers from Fedora, and I've googled a lot.
Can anyone PLEASE help me?
I'm gonna have to move the guests over to VMware if I can't get the network speed up, and I don't want to!
I don't want the job, and I don't really want VMware.
This is my /etc/network/interfaces file:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet manual
auto eth1
iface eth1 inet manual
auto br0
iface br0 inet static
address 192.168.185.9
network 192.168.185.0
netmask 255.255.255.0
broadcast 192.168.185.255
gateway 192.168.185.1
bridge_ports eth0
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off
auto br1
iface br1 inet static
address 192.168.186.9
network 192.168.186.0
netmask 255.255.255.0
broadcast 192.168.186.255
bridge_ports eth1
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off
Hope there's a guru out there who can tell me what the f... is going on!
I really like KVM, but I need to get this to work to be able to keep it on this particular installation.
Thanks
Have you checked the connection speed of the xp clients? Sounds like they are running 100mbs
There are no xp clients, there are two servers 2008 standard and 2011 SBS.
They both report 1Gb link speed with the virtio driver.
The third virtual machine, running Debian, is getting Gb speeds, it also has the virtio network card.
Are you using macvtap? I'm having slow speeds when using macvtap on windows. I switched it back to a bridge and the speeds are normal.
No, I use a bridge.
I'm moving the hosts over to VMWare this weekend.
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