vdpa_dpdk: Add delay between queries for accurate pps stats

quanwenli · quanwenli · commit e28dc48bfec1 · 2025-03-20T16:33:48.000+08:00
Before, querying PPS statistics twice in quick succession caused
the second query to return underestimated values. Adding a 2 second
delay ensures that the reported PPS is more accurate.

Signed-off-by: Wenli Quan &lt;wquan@redhat.com&gt;
diff --git a/qemu/tests/vdpa_dpdk.py b/qemu/tests/vdpa_dpdk.py
@@ -194,6 +194,7 @@ def run_test(forward_mode, guest, host, dpdk_tool_path, queue, pkts, mac=None):
         dpdk_tool_path, guest["cpu"], guest["pci"], forward_mode, queue, pkts
     )
     testpmd_guest.show_port_stats_all()
+    time.sleep(2)
     output = testpmd_guest.show_port_stats_all()
     pps_value = testpmd_guest.extract_pps_value(output, forward_mode)
 

Original file line number	Diff line number	Diff line change
`@@ -194,6 +194,7 @@ def run_test(forward_mode, guest, host, dpdk_tool_path, queue, pkts, mac=None):`
`194`	`194`	`dpdk_tool_path, guest["cpu"], guest["pci"], forward_mode, queue, pkts`
`195`	`195`	`)`
`196`	`196`	`testpmd_guest.show_port_stats_all()`
	`197`	`+ time.sleep(2)`
`197`	`198`	`output = testpmd_guest.show_port_stats_all()`
`198`	`199`	`pps_value = testpmd_guest.extract_pps_value(output, forward_mode)`
`199`	`200`