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Update of cpu topology tests #3686

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198aa33
feat: updated cpu topology tests
ShadowCurse May 15, 2023
8452a97
sq
ShadowCurse Oct 22, 2025
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51 changes: 40 additions & 11 deletions tests/integration_tests/functional/test_topology.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,17 +17,47 @@
def _check_cpu_topology(
test_microvm, expected_cpu_count, expected_threads_per_core, expected_cpus_list
):
expected_cpu_topology = {
"CPU(s)": str(expected_cpu_count),
"On-line CPU(s) list": expected_cpus_list,
"Thread(s) per core": str(expected_threads_per_core),
"Core(s) per socket": str(int(expected_cpu_count / expected_threads_per_core)),
"Socket(s)": "1",
"NUMA node(s)": "1",
expected_lscpu_output = {}
if PLATFORM == "x86_64":
expected_lscpu_output = {
"CPU(s)": str(expected_cpu_count),
"On-line CPU(s) list": expected_cpus_list,
"Thread(s) per core": str(expected_threads_per_core),
"Core(s) per socket": str(
int(expected_cpu_count / expected_threads_per_core)
),
"Socket(s)": "1",
"NUMA node(s)": "1",
}
else:
expected_lscpu_output = {
"CPU(s)": str(expected_cpu_count),
"On-line CPU(s) list": expected_cpus_list,
"Thread(s) per core": "1",
"Core(s) per cluster": str(
int(expected_cpu_count / expected_threads_per_core)
),
"Cluster(s)": "1",
"NUMA node(s)": "1",
}

utils.check_guest_cpuid_output(
test_microvm, "lscpu", None, ":", expected_lscpu_output
)

expected_hwloc_output = {
"depth0:": "1 Machine (type #0)",
"depth1:": "1 Package (type #1)",
"depth2:": "1 L3Cache (type #6)",
"depth3:": f"{expected_cpu_count} L2Cache (type #5)",
"depth4:": f"{expected_cpu_count} L1dCache (type #4)",
"depth5:": f"{expected_cpu_count} L1iCache (type #9)",
"depth6:": f"{expected_cpu_count} Core (type #2)",
"depth7:": f"{expected_cpu_count} PU (type #3)",
}

utils.check_guest_cpuid_output(
test_microvm, "lscpu", None, ":", expected_cpu_topology
test_microvm, "hwloc-info", None, ":", expected_hwloc_output
)


Expand Down Expand Up @@ -148,15 +178,14 @@ def _check_cache_topology_arm(test_microvm, no_cpus, kernel_version_tpl):
assert guest_slice == host_slice


@pytest.mark.skipif(
PLATFORM != "x86_64", reason="Firecracker supports CPU topology only on x86_64."
)
@pytest.mark.parametrize("num_vcpus", [1, 2, 16])
@pytest.mark.parametrize("htt", [True, False])
def test_cpu_topology(uvm_plain_any, num_vcpus, htt):
"""
Check the CPU topology for a microvm with the specified config.
"""
if htt and PLATFORM == "aarch64":
pytest.skip("SMT is configurable only on x86.")
vm = uvm_plain_any
vm.spawn()
vm.basic_config(vcpu_count=num_vcpus, smt=htt)
Expand Down