Technical information on how Google's "Retpoline" works is available, but you don't need to sweat the details. When implemented in Windows, this means that the operating system can protect against Specter attacks without a noticeable performance penalty.
We previously wrote that Specter fix-related speeds would come up with the upcoming update of Windows 10 in April 2019, also called 19H1. Now, Microsoft is slowly activating this feature on current Windows 10 computers, as long as they run the update from October 2018. This is the first time these patches have been available on a stable version of Windows.
This change came to Windows Update KB4482887, released on March 1, 2019. This only allows the new Retpoline feature "on some devices". As Microsoft's Retpoline blog post explains:
In the coming months, we will be activating Retpoline as part of cloud-based facade expansion. Due to the complexity of the implementation and the changes, it is only possible to enable Retpolin's performance for Windows 10, version 1809 and later.
In other words, Microsoft will slowly activate Retpoline on small amounts of computers at the same time. It works correctly – it's the "phased rollout". And it will only be activated on your computer if you have upgraded to Windows 10 October 2010 update.
All computers will receive this improvement as they upgrade to the April 2019 update according to Microsoft's Mehmet Iyigun.
Today we start our facade roll of Retpolin's performance optimization for Specter variant 2 mitigations to Windows 10 1809. As we have previously shared, Windows 10 19H1 will be sent with Retpoline by default. https://t.co/qCloXzDzWk#retpoline #spectre #windows 0,119659004]- Mehmet Iyigun (@mamyun) March 1, 2019
This feature is still disabled by default, and you proba lead it has not activated even if you use the update October 2018. But, if these Specter patches slowed down your computer, it should recover faster.
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