diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/i386/cpufreq/p4tcc.c | 11 | ||||
| -rw-r--r-- | sys/i386/i386/p4tcc.c | 11 |
2 files changed, 22 insertions, 0 deletions
diff --git a/sys/i386/cpufreq/p4tcc.c b/sys/i386/cpufreq/p4tcc.c index f65e5d1eb677..e3e0a030fe88 100644 --- a/sys/i386/cpufreq/p4tcc.c +++ b/sys/i386/cpufreq/p4tcc.c @@ -223,6 +223,17 @@ setup_p4tcc(void *dummy __unused) p4tcc_economy = tcc[TCC_LEVELS - 1].rlevel; p4tcc_performance = tcc[0].rlevel; + /* + * Since after the reboot the TCC is usually in the Automatic + * mode, in which reading current performance level is likely to + * produce bogus results make sure to switch it to the On-Demand + * mode and set to some known performance level. Unfortunately + * there is no reliable way to check that TCC is in the Automatic + * mode, reading bit 4 of ACPI Thermal Monitor Control Register + * produces 0 regardless of the current mode. + */ + p4tcc_setperf(p4tcc_performance); + p4tcc_percentage = p4tcc_getperf(); printf("Pentium 4 TCC support enabled, %d steps from 100%% to %d%%, " "current performance %u%%\n", nsteps, p4tcc_economy, diff --git a/sys/i386/i386/p4tcc.c b/sys/i386/i386/p4tcc.c index f65e5d1eb677..e3e0a030fe88 100644 --- a/sys/i386/i386/p4tcc.c +++ b/sys/i386/i386/p4tcc.c @@ -223,6 +223,17 @@ setup_p4tcc(void *dummy __unused) p4tcc_economy = tcc[TCC_LEVELS - 1].rlevel; p4tcc_performance = tcc[0].rlevel; + /* + * Since after the reboot the TCC is usually in the Automatic + * mode, in which reading current performance level is likely to + * produce bogus results make sure to switch it to the On-Demand + * mode and set to some known performance level. Unfortunately + * there is no reliable way to check that TCC is in the Automatic + * mode, reading bit 4 of ACPI Thermal Monitor Control Register + * produces 0 regardless of the current mode. + */ + p4tcc_setperf(p4tcc_performance); + p4tcc_percentage = p4tcc_getperf(); printf("Pentium 4 TCC support enabled, %d steps from 100%% to %d%%, " "current performance %u%%\n", nsteps, p4tcc_economy, |