예제 #1
0
파일: pstate.py 프로젝트: kirkboy/bits
def test_hardware_pstates(ratio_to_control_value):
    old_mwait = {}
    try:
        MSR_PLATFORM_INFO = 0xce
        IA32_PERF_CTL = 0x199
        min_ratio = testmsr.MSR("maximum efficiency ratio", bits.bsp_apicid(), MSR_PLATFORM_INFO, highbit=47, lowbit=40)[0]
        max_ratio = testmsr.MSR("max non-turbo ratio", bits.bsp_apicid(), MSR_PLATFORM_INFO, highbit=15, lowbit=8)[0]

        # Get the Turbo Mode Availability flag
        turbo_mode_available = bits.cpuid(bits.bsp_apicid(),0).eax >= 6 and (bits.cpuid(bits.bsp_apicid(),6).eax & 0x2)
        last_ratio = max_ratio
        if turbo_mode_available:
            last_ratio += 1

        duration = last_ratio - min_ratio + 1
        if turbo_mode_available:
            duration += 2
        print "Test duration is ~{} seconds...".format(duration)

        # Force use of MWAIT C3
        hint = 0x20
        cpus = bits.cpus()
        for apicid in cpus:
            old_mwait[apicid] = bits.get_mwait(apicid)
            bits.set_mwait(apicid, True, hint)

        bclk = testutil.adjust_to_nearest(bits.bclk(), 100.0/12) * 1000000

        for ratio in range(min_ratio, last_ratio + 1):
            control_value = ratio_to_control_value(ratio, min_ratio, max_ratio)
            for apicid in cpus:
                bits.wrmsr(apicid, IA32_PERF_CTL, control_value)

            if ratio == max_ratio + 1:
                # Needs to busywait, not sleep
                start = time.time()
                while (time.time() - start < 2):
                    pass

            aperf = bits.cpu_frequency()[1]
            aperf = testutil.adjust_to_nearest(aperf, bclk/2)
            aperf = int(aperf / 1000000)

            expected = int(ratio * bclk / 1000000)

            if ratio == max_ratio + 1:
                testsuite.test("Turbo measured frequency {} >= expected {} MHz".format(aperf, expected), aperf >= expected)
            else:
                testsuite.test("Ratio {} measured frequency {} MHz == expected {} MHz".format(ratio, aperf, expected), aperf == expected)
    finally:
        for apicid, old_mwait_values in old_mwait.iteritems():
            bits.set_mwait(apicid, *old_mwait_values)
예제 #2
0
def use_hint(hint=None):
    """Context manager to temporarily set the mwait hint of all CPUs"""
    global default_hint
    if hint is None:
        hint = default_hint
    old_mwait = {}
    try:
        for apicid in bits.cpus():
            old_mwait[apicid] = bits.get_mwait(apicid)
            bits.set_mwait(apicid, True, hint)
        yield
    finally:
        for apicid, old_mwait_values in old_mwait.iteritems():
            bits.set_mwait(apicid, *old_mwait_values)
예제 #3
0
파일: mwait.py 프로젝트: Tourountzis/bits
def use_hint(hint=None):
    """Context manager to temporarily set the mwait hint of all CPUs"""
    global default_hint
    if hint is None:
        hint = default_hint
    old_mwait = {}
    try:
        for apicid in bits.cpus():
            old_mwait[apicid] = bits.get_mwait(apicid)
            bits.set_mwait(apicid, True, hint)
        yield
    finally:
        for apicid, old_mwait_values in old_mwait.iteritems():
            bits.set_mwait(apicid, *old_mwait_values)
예제 #4
0
파일: testacpi.py 프로젝트: kirkboy/bits
def test_pstates():
    """Execute and verify frequency for each Pstate in the _PSS"""
    old_mwait = {}
    try:
        IA32_PERF_CTL = 0x199

        # Force use of MWAIT C3
        hint = 0x20
        cpus = bits.cpus()
        for apicid in cpus:
            old_mwait[apicid] = bits.get_mwait(apicid)
            bits.set_mwait(apicid, True, hint)

        cpupath_procid = acpi.find_procid()
        cpupath_uid = acpi.find_uid()
        procid_apicid, uid_x2apicid = acpi.parse_apic()
        def cpupath_apicid(cpupath):
            if procid_apicid is not None:
                procid = cpupath_procid.get(cpupath, None)
                if procid is not None:
                    apicid = procid_apicid.get(procid, None)
                    if apicid is not None:
                        return apicid
            if uid_x2apicid is not None:
                uid = cpupath_uid.get(cpupath, None)
                if uid is not None:
                    apicid = uid_x2apicid.get(uid, None)
                    if apicid is not None:
                        return apicid
            return bits.cpus()[0]

        bclk = testutil.adjust_to_nearest(bits.bclk(), 100.0/12) * 1000000

        uniques = acpi.parse_cpu_method("_PSS")
        for pss, cpupaths in uniques.iteritems():
            if not testsuite.test("_PSS must exist", pss is not None):
                testsuite.print_detail(acpi.factor_commonprefix(cpupaths))
                testsuite.print_detail('No _PSS exists')
                continue

            print "Test duration is ~{} seconds...".format(len(pss.pstates) + 2)

            for n, pstate in enumerate(pss.pstates):
                for cpupath in cpupaths:
                    apicid = cpupath_apicid(cpupath)
                    if apicid is None:
                        print 'Failed to find apicid for cpupath {}'.format(cpupath)
                        continue
                    bits.wrmsr(apicid, IA32_PERF_CTL, pstate.control)

                # Detecting Turbo frequency requires at least 2 pstates
                # since turbo frequency = max non-turbo frequency + 1
                turbo = False
                if len(pss.pstates) >= 2:
                    turbo = (n == 0 and pstate.core_frequency == (pss.pstates[1].core_frequency + 1))
                    if turbo:
                        # Needs to busywait, not sleep
                        start = time.time()
                        while (time.time() - start < 2):
                            pass

                # Abort the test if no cpu frequency is not available
                if bits.cpu_frequency() is None:
                    continue
                aperf = bits.cpu_frequency()[1]

                aperf = testutil.adjust_to_nearest(aperf, bclk/2)
                aperf = int(aperf / 1000000)

                if turbo:
                    testsuite.test("P{}: Turbo measured frequency {} >= expected {} MHz".format(n, aperf, pstate.core_frequency), aperf >= pstate.core_frequency)
                else:
                    testsuite.test("P{}: measured frequency {} MHz == expected {} MHz".format(n, aperf, pstate.core_frequency), aperf == pstate.core_frequency)
    finally:
        for apicid, old_mwait_values in old_mwait.iteritems():
            bits.set_mwait(apicid, *old_mwait_values)