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Got it.
the value of firmware will increase all the time until you power off the machine. I mean during system warm reset, TSC will not be reseted. CPU : Skylake From: Mantas Mikulėnas <grawity@xxxxxxxxx>
Looks like boot-timestamps.c first tries to read the ACPI FPDT table (it seems acpi-fpdt.c uses the "OS Loader StartImage Start" and "ExitBootServices Exit" fields), but if that's unavailable, then it uses timestamps
stored by systemd-boot in EFI variables (/sys/firmware/efi/efivars/LoaderTime*). The latter seems to be estimating it from RDTSC (src/boot/efi/util.c). On Wed, Oct 13, 2021 at 3:05 PM jiansong Xu <jiansong.xu@xxxxxxxxxx> wrote:
-- Mantas Mikulėnas |
Re: [External] : Re: firmware times reported were incorrect.
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- Subject: Re: [External] : Re: firmware times reported were incorrect.
- From: jiansong Xu <jiansong.xu@xxxxxxxxxx>
- Date: Thu, 14 Oct 2021 10:22:58 +0000
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- Re: firmware times reported were incorrect.
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- firmware times reported were incorrect.
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