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Re: [PATCH v4 1/47] x86/tsc: Never re-calibrate TSC frequency if its exact timing is known
- To: seanjc@xxxxxxxxxx
- From: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
- Date: Mon, 01 Jun 2026 22:46:09 +0100
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- Delivery-date: Mon, 01 Jun 2026 21:46:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, 29 May 2026 07:43:48 -0700, Sean Christopherson wrote:
> Don't re-calibrate the TSC frequency if the TSC is known to run at a fixed
> frequency. In practice, this is likely one big nop, as re-calibration is
> used only for SMP=n kernels, and only for hardware that is 20+ years old,
> i.e. is extremely unlikely to collide with TSC_KNOWN_FREQ.
>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
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