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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:LiberationSerif">Got it.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:#F8F8F8">the value of firmware will increase all the time until you power off the machine.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:#F8F8F8">I mean during system warm reset, TSC will not be reseted. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:LiberationSerif">CPU : Skylake</span><span lang="EN-US" style="font-size:10.5pt;font-family:等线"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:等线"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Mantas Mikulėnas <grawity@gmail.com>
<br>
<b>Sent:</b> 2021</span><span style="font-size:11.0pt">年</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">10</span><span style="font-size:11.0pt">月</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">13</span><span style="font-size:11.0pt">日</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">
20:33<br>
<b>To:</b> jiansong Xu <jiansong.xu@oracle.com><br>
<b>Cc:</b> systemd-devel@lists.freedesktop.org<br>
<b>Subject:</b> [External] : Re: [systemd-devel] firmware times reported were incorrect.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">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).<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">On Wed, Oct 13, 2021 at 3:05 PM jiansong Xu <<a href="mailto:jiansong.xu@oracle.com">jiansong.xu@oracle.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:#222222">This is bios from oracle, we noticed that the firmware times reported were incorrect.</span></i><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:#222222">Startup finished in</span></i><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:red">
59min 7.944s</span></i><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:#222222"> (firmware) + 33.051s (loader) + 4.428s</span></i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:#222222"><br>
<i>(kernel) + 1min 18.870s (initrd) + 44.494s (userspace) = 1h 1min 48.789s</i></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:#222222"> </span></i><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:#222222">May I ask what is the source of the
</span></i><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:red">firmware</span></i><i><span lang="EN-US" style="font-size:13.5pt;font-family:"Courier New";color:#222222"> ? is it read from acpi table?
</span></i><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">-- <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Mantas Mikul</span><span lang="EN-US" style="font-family:"Cambria",serif">ė</span><span lang="EN-US">nas<o:p></o:p></span></p>
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