![esxi how to enable turbo boost esxi how to enable turbo boost](https://www.qnap.com/static/landing/au/enterprise/img/virtual.png)
Hope that helps, and no one needs to ask an OSPM question here again. I provide this because a) it's interesting (to me at least.) and b) if you at least skim it you can see the extent to which Intel is serious about doing PM at the hardware level.Īnd here's some info specific to ESXi (5.5). Here's some info from Anandtech on the HWPM changes Intel made for Skylake. * I could be mistaken and this is 5.1 and 5.5 - I left VMW a year ago so I can't check, but it's safe to say 5.5+ definitely has better OSPM than 5.0. This is more of an issue for consumer parts but since you asked about C6 I'll leave it here. The higher and more constant the load, the less benefit you will see from OSPM.Ībout the C6-state: a big yellow light before enabling deeper C-states is having a (relatively) newer and/or high-quality power supply that can deliver a reliably low voltage, but since these are G9 HPEs you're fine. The only caveat is if you are running something that will see constant, heavy use, like SQL databases. Again it used to make a difference, but it made a bad first impression so people are stuck in that mindset. VM running slow? Turn off OSPM! People do it, perceive it to be faster (thanks placebo effect) or they run out of other options and just move on. It is the sacrificial lamb of frontline support. The biggest problem with OSPM has nothing to do with it, but people's perception of it. Or rather, maybe we were, but Intel succeeded in closing that gap faster than anticipated, and they change their H/W specs so quickly that we are okay with not trying to keep up.Īll that said, our default setting (still called Balanced?) is pretty effective because VMW works closely with Intel and vice versa to ensure that we are using as much of their H/W as possible (potential competitive differentiation for us, they want to make sure when someone spends $$$ they get something out of it). The other is simply that managing H/W states from the OS wasn't as effective as people (ourselves included) thought it would be. But now that the state transitions are more common (and much, much faster - Intel plugs away at making them shorter) H/W can do it pretty well heuristically. When the switch was more binary, S/W could (theoretically) manage it better by being load-aware. Two things mitigate this: one, Intel has dramatically improved the granularity of its hardware states, so instead of just a few T- and P-states, now you have many P-states and many C-states. OSPM was allowed because at the time we believed the opposite, that the OS is much more aware of its load and therefore could manage CPU states better.
ESXI HOW TO ENABLE TURBO BOOST SOFTWARE
The second factor is from Intel: they begrudgingly allowed OSPM out of necessity, but they believe they can do power management at the hardware level better than the OS can at a software level. This was especially true for HPE (HP at the time) systems because there was a somewhat notorious bad interaction between our OSPM and their firmware-level PM, but that has both been rectified for those older systems and designed around on both VMW and HPE's side since. So there is some legitimate older advice that says to always disable OSPM that does not carry over to 5.5+. Two factors here, first one from VMW: we grossly improved our OSPM for 5.5 (actually mostly one guy did - he's a freaking genius, and responsible for a bunch of other hardware tricks in ESXi) and again for 6.0 (again, same guy)*. If they start talking about T-states, politely nod and back away!
![esxi how to enable turbo boost esxi how to enable turbo boost](https://www.cisco.com/c/dam/en/us/td/docs/unified_computing/ucs/UCS_CVDs/Versastack_vmw6_flash.docx/_jcr_content/renditions/Versastack_vmw6_flash_107.png)
You are going to get a lot of cargo cult advice on OSPM that does not apply to ESXi 5.5+ and/or newer Intel processors. TLDR: the default setting for 5.5+ is pretty good, better than people think, but if you are running consistently high-load workloads you should turn it to Maximum Performance. Hey, I used to own OSPM for ESXi and before that worked for Intel.