diff options
authorColin Percival <cperciva@FreeBSD.org>2021-09-07 23:59:45 +0000
committerColin Percival <cperciva@FreeBSD.org>2021-09-08 01:31:55 +0000
commita8b89dff6ac026e60983824889d3666842ff409b (patch)
parent3c253d03d94e89cf1a26716b58fc27653df2a4f3 (diff)
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.
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/dev/acpica/acpi_timer.c b/sys/dev/acpica/acpi_timer.c
index 8be6e0edea7f..8e3947709b61 100644
--- a/sys/dev/acpica/acpi_timer.c
+++ b/sys/dev/acpica/acpi_timer.c
@@ -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[] = {