Re: [Qemu-devel] Enabling vhost-net cause insane high memory usage.

[Piotr Karbowski]

Hello,

On 01/15/2014 11:03 AM, Michael S. Tsirkin wrote:
> Could you explain how you measure that exactly?

I check the resident memory (RES) of qemu-system-x86_64 proces.


> Yes, this should not happen.
> One interesting thing to try would be switching device type from
> virtio-net to e1000.
>
> This means vhost will be initialized but not started.

So with virtio-net-pci + vhost=on I have VM process on 580-590 MB of RES 
memory, if I disable vhost OR set e1000 NIC and leave vhost enabled, its 
take just 109-120 MB of resident memory.

The memory usage check is done after few minutes after VM start, and the 
vm have minimal debian7 system without even single additional service.

-- Piotr.