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Disable acpi_timer_test by default

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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.
This commit is contained in:
Colin Percival 2021-09-07 16:59:45 -07:00
parent 3c253d03d9
commit a8b89dff6a
1 changed files with 1 additions and 1 deletions
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2
sys/dev/acpica/acpi_timer.c
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@ -79,7 +79,7 @@ static int acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS);
static void acpi_timer_boot_test(void);
static int acpi_timer_test(void);
static int acpi_timer_test_enabled = 1;
static int acpi_timer_test_enabled = 0;
TUNABLE_INT("hw.acpi.timer_test_enabled", &acpi_timer_test_enabled);
static device_method_t acpi_timer_methods[] = {