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[Question] How to measure the boot time #3777

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MichaelJeiShen opened this issue Apr 7, 2021 · 5 comments
Closed

[Question] How to measure the boot time #3777

MichaelJeiShen opened this issue Apr 7, 2021 · 5 comments
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@MichaelJeiShen
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I am trying to measure the bootup timing as detailed as possible.
For example how long it takes on bootloader/uboot/kernel/systemd etc.
Does openBMC has a tool for doing that?
@mdmillerii
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Systemd has bootchart support showing dependencies and recording the time.

The aspeed hardware has a free running us scale counter but I am not aware of any u-boot timing. I have not kept up with u-boot development and standard time collection.

If you are looking to optimize the boot time there are tradeoffs for boot flow. We'd need a description of your storage (mmc, flash, which bmc doc).

@MichaelJeiShen
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MichaelJeiShen commented Apr 8, 2021 •
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Systemd has bootchart support showing dependencies and recording the time.

Nice, then how do we obtain these times?
I just found a tool called systemd-analyze but not sure it is the correct tool.

The aspeed hardware has a free running us scale counter but I am not aware of any u-boot timing. I have not kept up with u-boot development and standard time collection.

U-boot boot time is a good-to-have for me. It’s not necessary.

If you are looking to optimize the boot time there are tradeoffs for boot flow. We'd need a description of your storage (mmc, flash, which bmc doc).

I just want to measure the boot time. Optimization is not included.

@geissonator
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Nice, then how do we obtain these times?
I just found a tool called systemd-analyze but not sure it is the correct tool.

https://github.com/openbmc/openbmc/wiki/Performance-Profiling-in-OpenBMC has some info on this. I did this back a few years ago and got some good data about BMC boot time and where we were spending the most time.

@stale
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stale bot commented Apr 17, 2022

This issue has been automatically marked as stale because no activity has occurred in the last 6 months. It will be closed if no activity occurs in the next 30 days. If this issue should not be closed please add a comment. Thank you for your understanding and contributions.

@stale stale bot added the stale label Apr 17, 2022
@edtanous
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Over a year old, and question was answered with documentation. Closing.

stefanberger pushed a commit to stefanberger/openbmc that referenced this issue Aug 1, 2023
@rfrandse
pldm: downstream srcrev bump 81778fed5f..b1d67eefd4 (openbmc#3777)
3bc6b26 
Reed Frandsen (1):
  Merge pull request openbmc#425 from amboar/for/1050/bios-check-apis-1

ManojKiran Eda (1):
  Change the default partition mode to A_Mode (openbmc#420)

Varsha Kaverappa (1):
  oem-ibm : Support for VPD record PSPD via file I/O with offset (openbmc#413)

Andrew Jeffery (3):
  host-bmc: test: Fix mocking errors in MockHostEffecterParser
  pldm: Include config.h via compiler argument
  pldm: Convert to pldm_bios_table_*_check() APIs

Change-Id: Iffcb6f963f536a1e68d81ab5fb4486cd157b7968
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@edtanous @geissonator @mdmillerii @MichaelJeiShen