This case is used to test the drift between host and guest.
Use taskset to make tsc program execute in a single cpu.
If the drift ratio bigger than 10%, then fail this case.
Signed-off-by: Amos Kong <akong@xxxxxxxxxx>
---
client/tests/kvm/deps/get_tsc.c | 27 ++++++++++
client/tests/kvm/tests/tsc_drift.py | 88 ++++++++++++++++++++++++++++++++
client/tests/kvm/tests_base.cfg.sample | 5 ++
3 files changed, 120 insertions(+), 0 deletions(-)
create mode 100644 client/tests/kvm/deps/get_tsc.c
create mode 100644 client/tests/kvm/tests/tsc_drift.py
diff --git a/client/tests/kvm/deps/get_tsc.c b/client/tests/kvm/deps/get_tsc.c
new file mode 100644
index 0000000..e91a41f
--- /dev/null
+++ b/client/tests/kvm/deps/get_tsc.c
@@ -0,0 +1,27 @@
+/*
+ * Programme to get cpu's TSC(time stamp counter)
+ * Copyright(C) 2009 Redhat, Inc.
+ * Amos Kong <akong@xxxxxxxxxx>
+ * Dec 9, 2009
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdint.h>
+
+typedef unsigned long long u64;
+
+u64 rdtsc(void)
+{
+ unsigned tsc_lo, tsc_hi;
+
+ asm volatile("rdtsc" : "=a"(tsc_lo), "=d"(tsc_hi));
+ return tsc_lo | (u64)tsc_hi << 32;
+}
+
+int main(void)
+{
+ printf("%lld\n", rdtsc());
+ return 0;
+}
diff --git a/client/tests/kvm/tests/tsc_drift.py b/client/tests/kvm/tests/tsc_drift.py
new file mode 100644
index 0000000..de2fb76
--- /dev/null
+++ b/client/tests/kvm/tests/tsc_drift.py
@@ -0,0 +1,88 @@
+import time, os, logging, commands, re
+from autotest_lib.client.common_lib import error
+from autotest_lib.client.bin import local_host
+import kvm_test_utils
+
+
+def run_tsc_drift(test, params, env):
+ """
+ Check the TSC(time stamp counter) frequency of guest and host whether match
+ or not
+
+ 1) Computer average tsc frequency of host's cpus by C the program
+ 2) Copy the C code to the guest, complie and run it to get tsc
+ frequency of guest's vcpus
+ 3) Sleep sometimes and get the TSC of host and guest again
+ 4) Compute the TSC frequency of host and guest
+ 5) Compare the frequency deviation between host and guest with standard
+
+ @param test: Kvm test object
+ @param params: Dictionary with the test parameters.
+ @param env: Dictionary with test environment.
+ """
+ drift_threshold = float(params.get("drift_threshold"))
+ interval = float(params.get("interval"))
+ cpu_chk_cmd = params.get("cpu_chk_cmd")
+ tsc_freq_path = os.path.join(test.bindir, 'deps/get_tsc.c')
+ host_freq = 0
+
+ def get_tsc(machine="host", i=0):
+ cmd = "taskset -c %s /tmp/get_tsc" % i
+ if machine == "host":
+ s, o = commands.getstatusoutput(cmd)
+ else:
+ s, o = session.cmd_status_output(cmd)
+ if s != 0:
+ logging.debug(o)
+ raise error.TestError("Fail to get tsc of host, ncpu: %d" % i)
+ return float(re.findall("(\d+)",o)[0])
+
+ vm = env.get_vm(params["main_vm"])
+ vm.verify_alive()
+ timeout = float(params.get("login_timeout", 240))
+ session = vm.wait_for_login(timeout=timeout)
+
+ commands.getoutput("gcc %s -o /tmp/get_tsc" % tsc_freq_path)
+ ncpu = local_host.LocalHost().get_num_cpu()
+
+ logging.info("Interval is %s" % interval)
+ logging.info("Determine the TSC frequency in the host")
+ for i in range(ncpu):
+ tsc1 = get_tsc("host", i)
+ time.sleep(interval)
+ tsc2 = get_tsc("host", i)
+
+ delta = tsc2 - tsc1
+ logging.info("Host TSC delta for cpu %s is %s" % (i, delta))
+ if delta < 0:
+ raise error.TestError("Host TSC for cpu %s warps %s" % (i, delta))
+
+ host_freq += delta / ncpu
+ logging.info("Average frequency of host's cpus: %s" % host_freq)
+
+ vm.copy_files_to(tsc_freq_path,'/tmp/get_tsc.c')
+ session.cmd("gcc /tmp/get_tsc.c -o /tmp/get_tsc")
+
+ s, guest_ncpu = session.cmd_status_output(cpu_chk_cmd)
+
+ success = True
+ for i in range(int(guest_ncpu)):
+ tsc1 = get_tsc("guest", i)
+ time.sleep(interval)
+ tsc2 = get_tsc("guest", i)
+
+ delta = tsc2 - tsc1
+ logging.info("Guest TSC delta for vcpu %s is %s" % (i, delta))
+ if delta < 0:
+ logging.error("Guest TSC for vcpu %s warps %s" % (i, delta))
+
+ ratio = 100 * (delta - host_freq) / host_freq
+ logging.info("TSC drift ratio for vcpu %s is %s" % (i, ratio))
+ if abs(ratio) > drift_threshold:
+ logging.error("TSC drift found for vcpu %s ratio %s" % (i, ratio))
+ success = False
+
+ if not success:
+ raise error.TestFail("TSC drift found for the guest, please check the "
+ "log for details")
+ session.close()
diff --git a/client/tests/kvm/tests_base.cfg.sample b/client/tests/kvm/tests_base.cfg.sample
index ceafebe..8e70746 100644
--- a/client/tests/kvm/tests_base.cfg.sample
+++ b/client/tests/kvm/tests_base.cfg.sample
@@ -331,6 +331,11 @@ variants:
drift_threshold = 10
drift_threshold_single = 3
+ - tsc_drift:
+ type = tsc_drift
+ drift_threshold = 10
+ interval = 30
+
- balloon_check: install setup unattended_install.cdrom
type = balloon_check
extra_params += " -balloon virtio"
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