some more questions: private network, shared mem

[Cybodog]

I have two more questions and my testing machines are limited to test on at this point:

1. can you set up vms on separate private networks inside of proxmox, something like:


____vmbr0---IP192.168.1.0/24--KVMs/VPSs
eth0-|
------vmbr1-----IP192.169.100.0/24--KVMs/VPSs

with or with out external networking?

2. I was under the impression that proxmox used shared mem for KVMs but the other day, poking around (I don't remember what comand, via the qemu monitor on on the host) I found a command that said shared mem was not compiled into the kernel. Are we using the shared mem ability of KVM with proxmox? What about ballooning?

 

[dietmar]

1. can you set up vms on separate private networks inside of proxmox, something like:

Yes.

2. I was under the impression that proxmox used shared mem for KVMs but the other day, poking around (I don't remember what comand, via the qemu monitor on on the host) I found a command that said shared mem was not compiled into the kernel.

What feature is not compiled in - exactly?

Are we using the shared mem ability of KVM with proxmox?

Sorry, I am not aware of that feature - what exactly?

What about ballooning?

ballooning needs guest support, so its quite useless - But AFAIK it works for linux guest, but i never tested it.

 

[mangoo]

ballooning needs guest support, so its quite useless - But AFAIK it works for linux guest, but i never tested it.

It works, but current implementation only allows you to lower guest memory.

For example, if you started a guest with 1 GB RAM, you won't be able to balloon out this guest's memory to 2 GB.

You will be able to decrease guest's memory to i.e. 512 MB, then increase it to 1 GB etc. - but never more than what was initially allocated at guest's start.

 

[faceless]

Sorry, I am not aware of that feature - what exactly?

I'm not the original poster, but I have a hunch he means this:
http://lwn.net/Articles/329123/
http://kerneltrap.org/mailarchive/linux-kvm/2009/4/20/5521504

Pretty new but looks very useful.