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Code Issues Releases Wiki Activity

improve performance by increasing the p-state

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This commit is contained in:
Stefan Lankes 2016-03-17 00:48:18 +01:00
parent 085308168e
commit 6136343ac7
1 changed files with 3 additions and 9 deletions
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12
hermit/arch/x86/kernel/processor.c
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@ -233,9 +233,6 @@ static int get_turbo_pstate(void)
uint64_t value;
int i, ret;
if (!is_turbo)
return get_max_pstate();
value = rdmsr(MSR_NHM_TURBO_RATIO_LIMIT);
i = get_max_pstate();
ret = (value) & 255;
@ -248,7 +245,7 @@ static int get_turbo_pstate(void)
static void set_pstate(int pstate)
{
uint64_t v = pstate << 8;
if (!is_turbo)
if (is_turbo)
v |= (1ULL << 32);
wrmsr(MSR_IA32_PERF_CTL, v);
}
@ -326,14 +323,11 @@ static void check_est(uint8_t out)
min_pstate = get_min_pstate();
turbo_pstate = get_turbo_pstate();
#if 0
// set boot_processor to turbo pstate because
// the boot processor has to handle the LwIP thread
if (out)
// set maximum p-state to get peak performance
if (is_turbo)
set_pstate(turbo_pstate);
else
set_pstate(max_pstate);
#endif
if (out)
dump_pstate();