feat: save network perf tests data

Save logs and json files for network perf tests.

Signed-off-by: Egor Lazarchuk <yegorlz@amazon.co.uk>

Author: ShadowCurse

tests/integration_tests/performance/test_network_ab.py

@@ -3,6 +3,8 @@
 """Tests the network latency of a Firecracker guest."""
 
 import re
+import json
+from pathlib import Path
 
 import pytest
 
@@ -55,7 +57,7 @@ def network_microvm(request, microvm_factory, guest_kernel_acpi, rootfs):
 
 @pytest.mark.nonci
 @pytest.mark.parametrize("network_microvm", [1], indirect=True)
-def test_network_latency(network_microvm, metrics):
+def test_network_latency(network_microvm, metrics, test_output_dir):
     """
     Test network latency by sending pings from the guest to the host.
     """
@@ -84,6 +86,11 @@ def test_network_latency(network_microvm, metrics):
     for sample in samples:
         metrics.put_metric("ping_latency", sample, "Milliseconds")
 
+    data = {"samples": samples}
+    metrics_path = Path(test_output_dir / "metrics.json")
+    with open(metrics_path, "w") as f:
+        json.dump(data, f)
+
 
 @pytest.mark.nonci
 @pytest.mark.timeout(120)
@@ -95,6 +102,7 @@ def test_network_tcp_throughput(
     payload_length,
     mode,
     metrics,
+    test_output_dir,
 ):
     """
     Iperf between guest and host in both directions for TCP workload.
@@ -133,4 +141,16 @@ def test_network_tcp_throughput(
     )
     data = test.run_test(network_microvm.vcpus_count + 2)
 
+    cpu_load_path = Path(test_output_dir / "cpu_load.json")
+    with open(cpu_load_path, "w") as f:
+        json.dump(data["cpu_load_raw"], f)
+    for i, g2h in enumerate(data["g2h"]):
+        path = Path(test_output_dir / f"g2h_{i}.json")
+        with open(path, "w") as f:
+            json.dump(g2h, f)
+    for i, h2g in enumerate(data["h2g"]):
+        path = Path(test_output_dir / f"h2g_{i}.json")
+        with open(path, "w") as f:
+            json.dump(h2g, f)
+
     emit_iperf3_metrics(metrics, data, warmup_sec)