def smi_latency():
MSR_SMI_COUNT = 0x34
print "Warning: touching the keyboard can affect the results of this test."
tsc_per_sec = bits.tsc_per_sec()
tsc_per_usec = tsc_per_sec / (1000 * 1000)
bins = [long(tsc_per_usec * 10**i) for i in range(9)]
bin_descs = [
"0 < t <= 1us",
"1us < t <= 10us",
"10us < t <= 100us",
"100us < t <= 1ms",
"1ms < t <= 10ms",
"10ms < t <= 100ms",
"100ms < t <= 1s ",
"1s < t <= 10s ",
"10s < t <= 100s ",
"100s < t ",
]
print "Starting test. Wait here, I will be back in 15 seconds."
(max_latency, smi_count_delta,
bins) = bits.smi_latency(long(15 * tsc_per_sec), bins)
BinType = namedtuple('BinType', ("max", "total", "count", "times"))
bins = [BinType(*b) for b in bins]
testsuite.test("SMI latency < 150us to minimize risk of OS timeouts",
max_latency / tsc_per_usec <= 150)
if not testsuite.show_detail():
return
for bin, desc in zip(bins, bin_descs):
if bin.count == 0:
continue
testsuite.print_detail("{}; average = {}; count = {}".format(
desc, bits.format_tsc(bin.total / bin.count), bin.count))
deltas = (bits.format_tsc(t2 - t1)
for t1, t2 in zip(bin.times, bin.times[1:]))
testsuite.print_detail(
" Times between first few observations: {}".format(" ".join(
"{:>6}".format(delta) for delta in deltas)))
if smi_count_delta is not None:
testsuite.print_detail(
"{} SMI detected using MSR_SMI_COUNT (MSR {:#x})".format(
smi_count_delta, MSR_SMI_COUNT))
testsuite.print_detail(
"Summary of impact: observed maximum latency = {}".format(
bits.format_tsc(max_latency)))
def smi_latency():
MSR_SMI_COUNT = 0x34
print "Warning: touching the keyboard can affect the results of this test."
tsc_per_sec = bits.tsc_per_sec()
tsc_per_usec = tsc_per_sec / (1000 * 1000)
bins = [long(tsc_per_usec * 10**i) for i in range(9)]
bin_descs = [
"0 < t <= 1us",
"1us < t <= 10us",
"10us < t <= 100us",
"100us < t <= 1ms",
"1ms < t <= 10ms",
"10ms < t <= 100ms",
"100ms < t <= 1s ",
"1s < t <= 10s ",
"10s < t <= 100s ",
"100s < t ",
]
print "Starting test. Wait here, I will be back in 15 seconds."
(max_latency, smi_count_delta, bins) = bits.smi_latency(long(15 * tsc_per_sec), bins)
BinType = namedtuple('BinType', ("max", "total", "count", "times"))
bins = [BinType(*b) for b in bins]
testsuite.test("SMI latency < 150us to minimize risk of OS timeouts", max_latency / tsc_per_usec <= 150)
if not testsuite.show_detail():
return
for bin, desc in zip(bins, bin_descs):
if bin.count == 0:
continue
testsuite.print_detail("{}; average = {}; count = {}".format(desc, bits.format_tsc(bin.total/bin.count), bin.count))
deltas = (bits.format_tsc(t2 - t1) for t1,t2 in zip(bin.times, bin.times[1:]))
testsuite.print_detail(" Times between first few observations: {}".format(" ".join("{:>6}".format(delta) for delta in deltas)))
if smi_count_delta is not None:
testsuite.print_detail("{} SMI detected using MSR_SMI_COUNT (MSR {:#x})".format(smi_count_delta, MSR_SMI_COUNT))
testsuite.print_detail("Summary of impact: observed maximum latency = {}".format(bits.format_tsc(max_latency)))
def smi_latency():
IA32_TSC_MSR = 0x10
MSR_SMI_COUNT = 0x34
bsp_apicid = bits.bsp_apicid()
if bits.rdmsr(bsp_apicid, IA32_TSC_MSR) is None:
raise RuntimeError("Reading of IA32_TSC MSR caused a GPF")
print "Warning: touching the keyboard can affect the results of this test."
print "Starting pass #1. Calibrating the TSC."
start = time.time()
tsc1 = bits.rdmsr(bsp_apicid, IA32_TSC_MSR)
while time.time() - start < 1:
pass
stop = time.time()
tsc2 = bits.rdmsr(bsp_apicid, IA32_TSC_MSR)
tsc_per_sec = (tsc2 - tsc1) / (stop - start)
tsc_per_usec = tsc_per_sec / (1000*1000)
def show_time(tscs):
units = [(1000*1000*1000, "ns"), (1000*1000, "us"), (1000, "ms")]
for divisor, unit in units:
temp = tscs / (tsc_per_sec / divisor)
if temp < 10000:
return "{}{}".format(int(temp), unit)
return "{}s".format(int(tscs / tsc_per_sec))
bins = [long(tsc_per_usec * 10**i) for i in range(9)]
bin_descs = [
"0 < t <= 1us",
"1us < t <= 10us",
"10us < t <= 100us",
"100us < t <= 1ms",
"1ms < t <= 10ms",
"10ms < t <= 100ms",
"100ms < t <= 1s ",
"1s < t <= 10s ",
"10s < t <= 100s ",
"100s < t ",
]
print "Starting pass #2. Wait here, I will be back in 15 seconds."
(max_latency, smi_count_delta, bins) = bits.smi_latency(long(15 * tsc_per_sec), bins)
BinType = namedtuple('BinType', ("max", "total", "count", "times"))
bins = [BinType(*b) for b in bins]
testsuite.test("SMI latency < 150us to minimize risk of OS timeouts", max_latency / tsc_per_usec <= 150)
if not testsuite.show_detail():
return
for bin, desc in zip(bins, bin_descs):
if bin.count == 0:
continue
testsuite.print_detail("{}; average = {}; count = {}".format(desc, show_time(bin.total/bin.count), bin.count))
deltas = (show_time(t2 - t1) for t1,t2 in zip(bin.times, bin.times[1:]))
testsuite.print_detail(" Times between first few observations: {}".format(" ".join("{:>6}".format(delta) for delta in deltas)))
if smi_count_delta is not None:
testsuite.print_detail("{} SMI detected using MSR_SMI_COUNT (MSR {:#x})".format(smi_count_delta, MSR_SMI_COUNT))
testsuite.print_detail("Summary of impact: observed maximum latency = {}".format(show_time(max_latency)))
