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host:win7 8GRAM
guest:win7 1GRAM

I tried both on VirtualBox and vmware

when guest stop, the free memory of host is 4G~6G

when guest running but "nothing" is working in guest, the free memory of host is 3G~5G

when the guest is working(like windows update), the memory of host left only 100M~1G, and every operation in host is very slow.

and then, I power off the guest, the free memory of host is back to 4G~6G, and no slow motion immediately

I can't figure out the memory usage of virtual machine.

thanks for any reply

share|improve this question
From where are you reading the RAM available, specifically the "100~1G" value? – user3463 Jul 15 '12 at 5:18
@RandolphWest : I read the RAM available from Windows Task Manager and another software can list the system resources – Tony Lee Jul 15 '12 at 5:26
When you run the guest, what is the usage of RAM inside the VM? Does it respect your 1GB limit? – user3463 Jul 15 '12 at 5:30
@RandolphWest I only run windows update in guest. And the guest also has free RAM(windows task manager).For the convenience of explanation, I increase the guest RAM to 2G, and now only windows update is running, the memory available in task manager is about 1G. memory available in host is also 800M – Tony Lee Jul 15 '12 at 5:40
Do you have a CPU that supports VT-x, and have you enabled the virtualization features in your BIOS? – Zoredache Jul 15 '12 at 6:30

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