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<base href="https://bugs.dpdk.org/">
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<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - Issues with packet capture counting in dpdk-dumpcap"
href="https://bugs.dpdk.org/show_bug.cgi?id=1604">1604</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Issues with packet capture counting in dpdk-dumpcap
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>23.11
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>other
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>junwang01@cestc.cn
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">Is the final count returned during packet capture with DPDK Dumpcap a
cumulative value, and could there be any issues with it?
[root@dpdk04 /]# /dpdk/app/dpdk-dumpcap -i 0000:1b:00.0
File: /tmp/dpdk-dumpcap_0_0000:1b:00.0_20241217074027.pcapng
Capturing on '0000:1b:00.0'
Packets captured: 20 ^C
Packets received/dropped on interface '0000:1b:00.0': 20/0 (100.0)
[root@dpdk04 /]# /dpdk/app/dpdk-dumpcap -i 0000:1b:00.0
File: /tmp/dpdk-dumpcap_0_0000:1b:00.0_20241217074045.pcapng
Capturing on '0000:1b:00.0'
Packets captured: 13 ^C
Packets received/dropped on interface '0000:1b:00.0': 33/0 (100.0)
[root@dpdk04 /]# /dpdk/app/dpdk-dumpcap -i 0000:1b:00.0
File: /tmp/dpdk-dumpcap_0_0000:1b:00.0_20241217074055.pcapng
Capturing on '0000:1b:00.0'
Packets captured: 40 ^C
Packets received/dropped on interface '0000:1b:00.0': 73/0 (100.0)
I noticed that the final statistics of dpdk-dumpcap for packet capture show
that received is a cumulative value. Wouldn't it be more appropriate to have
the correct value for each execution instead? After analyzing the code, I
confirmed that this cumulative design applies to both received and dropped
statistics.
static void
pdump_sum_stats(uint16_t port, uint16_t nq,
struct rte_pdump_stats
stats[RTE_MAX_ETHPORTS][RTE_MAX_QUEUES_PER_PORT],
struct rte_pdump_stats *total)
{
uint64_t *sum = (uint64_t *)total;
unsigned int i;
uint64_t val;
uint16_t qid;
for (qid = 0; qid < nq; qid++) {
const RTE_ATOMIC(uint64_t) *perq = (const uint64_t __rte_atomic
*)&stats[port][qid];
for (i = 0; i < sizeof(*total) / sizeof(uint64_t); i++) {
val = rte_atomic_load_explicit(&perq[i],
rte_memory_order_relaxed);
sum[i] += val;
}
}
}
</pre>
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