On 13 Mar 2026, at 21:51, Timothy Redaelli via dev wrote:
> When --format json is passed to ovs-appctl, pmd-stats-show returns a
> JSON array with one object per PMD thread (plus an object for the main
> thread, identified by "type":"main"). Each object contains packet
> counts, cache hit counters, cycle usage and their derived percentages.
> All floating-point fields are always present even when the divisor is
> zero (they are reported as 0.0 in that case).
>
> Example output (abbreviated):
> [{"type":"pmd","numa_id":0,"core_id":3,
> "packets_received":1000,"emc_hits":500,
> "megaflow_hits":400,"miss_with_success_upcall":100,
> "idle_cycles_pct":90.0,"processing_cycles_pct":10.0,...}]
>
> Signed-off-by: Timothy Redaelli <[email protected]>
Hi Timothy,
For this patch, please index the PMDs by their core_id rather than using
an array. This is consistent with the approach used in patch 3
(pmd-sleep-show). Here's the suggested structure:
{
"pmds": {
"3": {
"numa_id": 0,
"packets_received": 1000,
"packet_recirculations": 50,
"avg_datapath_passes_per_packet": 1.05,
"phwol_hits": 100,
"mfex_opt_hits": 200,
"simple_match_hits": 150,
"emc_hits": 500,
"smc_hits": 100,
"megaflow_hits": 400,
"avg_subtable_lookups_per_megaflow_hit": 1.2,
"miss_with_success_upcall": 100,
"miss_with_failed_upcall": 0,
"avg_packets_per_output_batch": 32.5,
"idle_cycles": 900000,
"idle_cycles_percentage": 90.0,
"processing_cycles": 100000,
"processing_cycles_percentage": 10.0,
"avg_cycles_per_packet": 1000.0,
"avg_processing_cycles_per_packet": 100.0
},
"5": {
"numa_id": 0,
...
}
}
}
You can skip the type variable, and also it would be wise to group related
counters. Maybe packet, hit, cycle counters, etc.?
Cheers,
Eelco
[...]
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