virtualbox.org

Hi all.

I am VERY glad the CPU-capping option made its way into the gui. As I'm not on 4.1 yet I have one question for that: I have some quite old guests that in general do not use much of a current CPU. I assume they will be happy with about 25% of a single I7-core.
Does that mean, that - if I set CPU-Cap to 25% i can start about 4 guests per physical core available (minus maybe 50% for the host)?
On a quadcore that would theoretically make a total of 12 to 14 guests (Whether there is a usecase may be a different question - I'm lacking experience here)?

Is that correct?

Thank you and cheers,
Martin

In theory, that will be the case, if you have a true quad core CPU. If you have an i7, then take a good look at it's specs. If you see 4 cores, it means you have a dual core i7 that's hyperthreaded capable. All core-i series are HT capable.
In practise, if you start two VMs, the Host will divide the load on two cores. Start a third, and a third core is used to spread the load. Only if you start more VMs than you have physical cores, will it run more than one VM per core.

Sas:
All i7 are at least Quad-core (most are quad, rare are six-core) and all HT capable. (so 8-12 hyper-threads)

smartysmart34: Yes, but it will damage your Audio (from VM), and may have other negative effects. (In VBox, CPU cap has side effects, it is _not_ like slower Pentium-III chip). Slow / old CPUs have no such side effects.

-Technologov

Technologov wrote:Sas:
All i7 are at least Quad-core (most are quad, rare are six-core) and all HT capable. (so 8-12 hyper-threads)

WRONG! My Dell Latitude E6510 has an i7 that's dual core with HT. I'd rather it was quad, but the speed per core would have been cut in half.

Huh. indeed one such (anti-)monster found:
http://ark.intel.com/products/43560/Int ... -2_66-GHz)

Dual-core i7 ! yay ! Never knew that such an ugly mutation exist !

Yes, mobile Core i7 suck hard -- Quad-core are underclocked by 50% or so compared to the desktop variant ! (fortunately I have desktop full-speed, quad-core i7)

Technologov wrote:Man, I'm _very_ rarely being wrong on the CPUs side.

Dell E6510 has Core i7 820QM CPU:
http://www.notebookcheck.net/Dell-Latit ... 036.0.html

...which has full 4 cores: (8 virtual, due to HT)
http://ark.intel.com/products/43124

In fact I even know CPUs, that have VT-x, but aren't 64-bit capable.
Do you know any ? quick !

Back at you! http://www.intel.com/products/processor ... ations.htm
All i7's with 2 cores at the bottom. Take it or suck it.

Yes, You're right. I guess I have to suck it this time.