Bonding causes VM networking to fail.

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wipeout_dude

Member
Jul 15, 2012
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I have been playing with network bonding over the last two days and the primary issue I am having is that when I use bonding the networks in the VM's fail.. They just won't connect to the network..

Here is my network config..

Code: 
# network interface settings
auto lo
iface lo inet loopback

iface eth0 inet manual

iface eth1 inet manual

auto bond0
iface bond0 inet manual
        slaves eth0 eth1
        bond_miimon 100
        bond_mode balance-rr

auto vmbr0
iface vmbr0 inet static
        address  192.168.0.251
        netmask  255.255.255.0
        gateway  192.168.0.1
        bridge_ports bond0
        bridge_stp off
        bridge_fd 0

Any ideas?

Secondary issues are the bonding mode..

When using 802.3ad the performance is terrible (95Mbps on a 2 x 1Gb link) and only seems to go through one of the network links.. That I am still playing with but so far balance-rr gets me the best raw performance of about 1.5Gbps..
 
wipeout_dude said:
When using 802.3ad the performance is terrible (95Mbps on a 2 x 1Gb link) and only seems to go through one of the network links..
Click to expand...

That is expected, and the way 802.3ad works. But you can duplicate speed if you open 2 connections.
 
Hi.. I'm not getting 950Mbps on a 2x1Gbps link which I would expect to see.. I am getting 95Mbps, sometimes 140Mbps.. Still working on it to see if I can work it out..

Out of interest it seems that the VM's network failure had something to do with using the balance-rr mode on the bond.. Still testing to confirm that too..
 
802.3ad works here with the expected results (900 Mbps and more) take a look on your switch settings. you get the expected results without bonding?
 
For anyone finding this tread..

Don't use balance-rr for your bond.. Although it has the highest raw throughput because it uses the links simultaneously the VM's networking doesn't appear to like it very much..

In my testing balance-alb and balance-tlb gave intermittent connectivity issues.. 802.3ad worked with a stable connection but I couldn't get the throughput past that of a single link (~945Mbps), even when accessing it from two sources.. On my BSD box with an LACP bond through the same switch from two sources I can get up to 1.8Gbps..

#All throughput tests done with iperf#
 
wipeout_dude said:
For anyone finding this tread..

Don't use balance-rr for your bond.. Although it has the highest raw throughput because it uses the links simultaneously the VM's networking doesn't appear to like it very much..

In my testing balance-alb and balance-tlb gave intermittent connectivity issues.. 802.3ad worked with a stable connection but I couldn't get the throughput past that of a single link (~945Mbps), even when accessing it from two sources.. On my BSD box with an LACP bond through the same switch from two sources I can get up to 1.8Gbps..

#All throughput tests done with iperf#
Click to expand...

balance-alb and balance-tlb use some arp tricks, so it's not very stable.
LACP on linux with bonding module can't do load balancing.

Redhat is working on a new project : libteam (nic teaming)
https://fedorahosted.org/libteam/wiki/CompareToBonding

seem to support loadbalancing on lacp :)
 
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