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Decrease ACPI-fast timecounter quality to 900 and increase HPET timecounter

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quality to 950.  HPET on modern platforms usually have better resolution and
lower latency than ACPI timer.  Effectively this changes default timecounter
hardware from ACPI-fast to HPET by default when both are available.

Discussed with:	avg
This commit is contained in:
Jung-uk Kim 2011-05-23 20:12:36 +00:00
parent 7b4f47c1db
commit ca5f1efdd9
2 changed files with 2 additions and 2 deletions
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2
sys/dev/acpica/acpi_hpet.c
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@ -476,7 +476,7 @@ hpet_attach(device_t dev)
sc->tc.tc_get_timecount = hpet_get_timecount,
sc->tc.tc_counter_mask = ~0u,
sc->tc.tc_name = "HPET",
sc->tc.tc_quality = 900,
sc->tc.tc_quality = 950,
sc->tc.tc_frequency = sc->freq;
sc->tc.tc_priv = sc;
tc_init(&sc->tc);

2
sys/dev/acpica/acpi_timer.c
View File

@ -203,7 +203,7 @@ acpi_timer_probe(device_t dev)
if (j == 10) {
acpi_timer_timecounter.tc_name = "ACPI-fast";
acpi_timer_timecounter.tc_get_timecount = acpi_timer_get_timecount;
acpi_timer_timecounter.tc_quality = 1000;
acpi_timer_timecounter.tc_quality = 900;
} else {
acpi_timer_timecounter.tc_name = "ACPI-safe";
acpi_timer_timecounter.tc_get_timecount = acpi_timer_get_timecount_safe;