CPU performance - disable bug mitigations

Colin Watson cjwatson at ubuntu.com
Wed Nov 21 08:09:20 UTC 2018


On Wed, Nov 21, 2018 at 08:20:56AM +0100, Ralf Mardorf via ubuntu-users wrote:
> On Tue, 20 Nov 2018 17:05:08 +0100, Goran wrote:
> >How can I disable these mitigations without restart (without boot
> >command line)?
> 
> You can't! You have to downgrade or remove the firmware and to reboot
> to perhaps get rid of some of it. To get rid of most of it, you
> likely need to downgrade the kernel.

Or you could just use the kernel parameters that control it.

  pti=off spectre_v2=off spec_store_bypass_disable=off

(This does require restarting, but is less invasive than downgrading the
kernel.)

-- 
Colin Watson                                       [cjwatson at ubuntu.com]



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