git: a8b89dff6ac0 - main - Disable acpi_timer_test by default
John Baldwin
jhb at FreeBSD.org
Wed Sep 8 16:01:58 UTC 2021
On 9/7/21 6:32 PM, Colin Percival wrote:
> The branch main has been updated by cperciva:
>
> URL: https://cgit.FreeBSD.org/src/commit/?id=a8b89dff6ac026e60983824889d3666842ff409b
>
> commit a8b89dff6ac026e60983824889d3666842ff409b
> Author: Colin Percival <cperciva at FreeBSD.org>
> AuthorDate: 2021-09-07 23:59:45 +0000
> Commit: Colin Percival <cperciva at FreeBSD.org>
> CommitDate: 2021-09-08 01:31:55 +0000
>
> Disable acpi_timer_test by default
>
> This disables testing the ACPI timer by default, forcing the use of
> ACPI-fast rather than ACPI-safe. The broken-ACPI-timers workaround
> can be re-enabled by setting the hw.acpi.timer_test_enabled=1 tunable.
>
> This speeds up the FreeBSD boot process by 140 ms on an EC2 c5.xlarge
> instance.
>
> This change will not be MFCed.
>
> Assuming no problems are reported, acpi_timer_test, the associated
> tunable, and the ACPI-safe timecounter should be removed in FreeBSD 15.
>
> Relnotes: The ACPI-safe timer is disabled in favour of ACPI-fast;
> if timekeeping issues are observed, please test with
> hw.acpi.timer_test_enabled=1 in loader.conf and report
> if that fixes the problem.
Perhaps it should default to '1' for i386 and '0' otherwise? The relevant
chipsets were 32-bit only, so this would be a simple way to skip the test for
modern hardware, and you could probably MFC that safely.
--
John Baldwin
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