Still Need To Optimizing Power Settings On DELL 12th Generation Servers For Lightning Fast Hyper-V Live Migrations?

Do you remember my blog from 2011 on optimizing some system settings to get way better Live Migration performance with 10Gbps NICs?  It’s over here Optimizing Live Migrations with a 10Gbps Network in a Hyper-V Cluster. This advice still holds true, but the power optimization settings & interaction between DELL Generation 12 Server and with Windows Server 2012 has improved significantly. Where with Windows Server 2008 R2 we could hardly get above 16% bandwidth consumption out of the box with Live Migration over a 10Gbps NIC today this just works fine.

Don’t believe me?image You do now? A cool Winking smile

For overall peak system performance you might want to adjust your Windows configuration settings to run the High Performance preferred power plan, if that’s needed.image

You might do no longer need to dive into the BIOS. Of cause if you have issues because your hardware isn’t that intelligent and/or are still running Windows 2008 R2 you do want to there. As when it comes to speed we want it all and we want it now Smile and than you still want to dive into the BIOS and tweak it even on the DELL 12th Generation hardware. Test & confirm I’d say but you should notice a difference, all be it smaller than with Windows Server 2008 R2.

Well let’s revisit this again as we are now no longer working with Generation 10 or 11 servers with an “aged” BIOS. Now we have decommissioned the Generation 10 server,  upgrade the BIOS of our Generation 11 Servers and acquired Generation 12 servers. We also no use UEFI for our Hyper-V host installations. The time has come to become familiar with those and the benefits they bring. It also future proofs our host installations.

So where and how do I change the power configuration settings now? Let’s walk through one together. Reboot your server and during the boot cycle hit F2 to enter System Setup.image

Select System BIOSimage

Click on System Profile Settingsimage

The settings you want to adapt are:

  • CPU Power Management should be on Maximum Performance
  • Setting Memory Frequency to “Maximum Performance”
  • C1E states should be disabled
  • C states should be disabled


That’s it. The below configuration has optimized your power settings on a DELL Generation 12 server like the R720.image

When don, click “Back” and than Finish. A warning will pop up and you need to confirm you want to safe your changes. Click “Yes” if you indeed want to do this.image

You’ll get a nice confirmation that your settings have been saved. Click “OK” and then click Finish.image

Confirm that you want to exit and reboot by clicking yes and voila, when the server comes back on it will be running a full speed at the cost of more power consumption, extra generated heat and cooling.image

Remember, if you don’t need to run at full power, don’t. And if you consider using  Dynamic Optimization and Power Optimization in System Center Virtual Machine Manager 2012. Save a penguin!

7 thoughts on “Still Need To Optimizing Power Settings On DELL 12th Generation Servers For Lightning Fast Hyper-V Live Migrations?

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  3. Hi,
    What about disabling TurboBoost, Hyper-Threading, and SpeedStep? These CPU technologies can also have an impact, sometimes not for the best, on overall Hyper-V host performance.

    • Hi Philip,

      While some people have seen issues with Hyper-Threading in the past I did not and we have it running even on dedicated Hyper-V clusters for SQL Server virtualization. Tests, in these environments, never showed much difference, but I encourage anyone to test in their environments as it can have an impact. The C states wreck havoc on the 10Gbps cards perfomance. While less so since Windows Server 2012 it still makes a 20% difference. We never had many issues with turbo boost or difference that we consider it a mandatory tweak. Just for the record, I’m only talking server grade hardware here. There are different tunings to do for both CPU & latency optimization. A nice whitepaper on this : If you need to the last ounce of performance & network speed /latecency optimization or perhaps rather consistancy/predictability, turning of Hyper Threading helps (and perhaps go for quad socket servers) and Turbo Boost.
      Thanks for reading!

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