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C1100 CPU throttling

post #1 of 6
Thread Starter 
Hey all,

Got around to setting my home server up. I tried loading down the CPU because I was curious what I could do with 2 l5520s. I see that I'm only hitting about 1150-1400MHz speed-wise on each core in VMware for a total of ~21.2GHz. I always assumed the total was core all cores added together, so correct me if I'm wrong on that. When I believe each thread to be at 100% load, all threads together are reported as only about ~58 to ~60% (21.2GHz). The fans are spinning and can be heard but are very quiet compared to what I imagine they should be at if the server's cpu was running at 100% utilization.

I am using VMWare 5.1 and just gave all resources to a windows 8 VM. Like I said, I wanted to see what the CPUs could do in multi-threaded apps.


Any ideas? When I do create VMs that will live longer than the weekend, I definitely want to run the CPU faster than 1100-1500MHz.

Should I be disabling the power features in the BIOS? I assumed I could hit full speed with them on.


EDIT: Hmm, I have turbo enabled, maybe this only counts the speed of physical cores and its showing the cores are in turbo mode currently?
Edited by Mr.N00bLaR - 11/23/13 at 11:50am
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post #2 of 6
My guess is that you've got hyperthreading turned on. Those processors are what, 2.27ghz each, with 4 physical cores each? that'd run right around 9ghz per socket, which it sounds like you're actually exceeding.

Edit - I've seen this myself on everything from 5570's to 2687W's in our UCS/VMware environment. Hyperthreading interleaves the workload on a processor (usually a command is waiting on disk IO, or something else) so what you're seeing is the processor letting each thread have half of the clock speed of the cpu core. http://en.wikipedia.org/wiki/Hyper-threading
Edited by mbreitba - 11/23/13 at 3:13pm
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post #3 of 6
Thread Starter 
Oh, interesting. I've never really had a CPU with hyperthreading before. That means that some cores are almost hitting 3GHz? thats quite a nice hassle-free overclock. I wonder if I should sell these l5520s and buy two of the hexacores and take a gamble on how far they turbo ..lol.
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post #4 of 6
Spec's say that max turbo frequency on 4 cores active is +133 mhz, and if only 2 cores are active it'll go +266mhz, so you're going to get around 2.4ghz per core out of it if you're running all 4 cores at the same time. I'd be willing to bet that the numbers you're seeing are some sort of anomaly or rounding error, rather than the CPU actually clocking up to 3ghz.
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by mbreitba View Post

Spec's say that max turbo frequency on 4 cores active is +133 mhz, and if only 2 cores are active it'll go +266mhz, so you're going to get around 2.4ghz per core out of it if you're running all 4 cores at the same time. I'd be willing to bet that the numbers you're seeing are some sort of anomaly or rounding error, rather than the CPU actually clocking up to 3ghz.
Awww, oh well. 2.4GHz isn't bad though. Thanks for the help.
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post #6 of 6
@OP

In my experience, ever since Hyperthreading was introduced, it's performance is worth about 0.5 cores. I've tested this a few times with something fairly simple (a software compile) and seeing how many parallel jobs it would support. From what I've seen, a 2 core processor with HT (or two single core processors with HT) are the equivalent of a three core processor with no HT.

So as a real world example, a 6 core, 12 thread 3930K is worth about nine non-HT cores in terms of performance.
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