Comments on: Checking To See If Intel Speed Shift Is Enabled

By: Glenn Berry

Glenn Berry — Sun, 10 Nov 2019 20:35:14 +0000

In reply to Brett Shearer. SpeedStep will vary your clock speed up and down (mostly down) in response to your workload to try to minimize energy usage. Speed Shift just lets the CPU have more direct control from the OS to throttle up more quickly. There is no performance downside from Speed Shift. The performance impact will be fairly low in most situations, but it will always be positive. We might as well take advantage of this feature if possible.

By: Brett Shearer

Brett Shearer — Sun, 10 Nov 2019 20:15:00 +0000

Hi Glen,

Just to clarify – you are saying that the performance impact of previous versions of Speed Step have been mitigated (where the advice was to disable), and Speed Shift is now going to improve performance?

In the case of a long set of single row inserts all performed on the same SPID – will this be faster or slower with Speed Shift enabled?

By: Glenn Berry

Glenn Berry — Tue, 05 Nov 2019 22:04:41 +0000

Glad to help!

By: SAinCA

SAinCA — Tue, 05 Nov 2019 18:41:33 +0000

Yikes, Glenn! So glad you publish this stuff… Q is, why wouldn’t Dell have the correct BIOS settings out of the gate for a Skylake-SP 740XD chassis equipped with 6144 CPUs? Retrofitting BIOS settings now, to get what we paid for. THANKS for making us aware.