红帽全球峰会6.2. 诊断
要获得有用的输出，请将系统置于稳定状态并重置要测量的统计信息：
# put system into steady state
ovs-appctl dpif-netdev/pmd-stats-clear
# wait <x> seconds
sleep <x>
ovs-appctl dpif-netdev/pmd-stats-show以下是输出结果的示例：
[root@overcloud-compute-0 ~]# ovs-appctl dpif-netdev/pmd-stats-clear && sleep 10 && ovs-appctl dpif-netdev/pmd-stats-show |
egrep 'core_id (2|22):' -A9
pmd thread numa_id 0 core_id 22:
emc hits:17461158
megaflow hits:0
avg. subtable lookups per hit:0.00
miss:0
lost:0
polling cycles:4948219259 (25.81%)
processing cycles:14220835107 (74.19%)
avg cycles per packet: 1097.81 (19169054366/17461158)
avg processing cycles per packet: 814.43 (14220835107/17461158)
--
pmd thread numa_id 0 core_id 2:
emc hits:14874381
megaflow hits:0
avg. subtable lookups per hit:0.00
miss:0
lost:0
polling cycles:5460724802 (29.10%)
processing cycles:13305794333 (70.90%)
avg cycles per packet: 1261.67 (18766519135/14874381)
avg processing cycles per packet: 894.54 (13305794333/14874381)
请注意，core_id 2 主要忙碌，花费 70% 的时间处理以及时间轮询时间的 30%。
polling cycles:5460724802 (29.10%)
processing cycles:13305794333 (70.90%)
在本例中，错误表示 DPDK 数据路径中未分类的数据包（'emc' 或 'dp' 类器）。在正常情况下，它们将发送到 a proto 层。在个别情况下，由于流重新验证锁定，或者 a proto 层返回错误，数据包会被丢弃。在这种情况下，丢失 的值也会递增，以指示丢失。
emc hits:14874381
megaflow hits:0
avg. subtable lookups per hit:0.00
miss:0
lost:0有关更多信息，请参阅 OVS-DPDK 数据路径分类器。
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