VPP main thread blocked by DPDK APIs

[Ruitao Gong <ruitao.gong@mavenir.com>]

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hi DEVers,

Send this mail for some help about VPP and DPDK.
rte_eth_stats_get (xd->port_id, &xd->stats)
rte_eth_xstats_get (xd->port_id, xd->xstats, len)
    APIs in dpdk_update_counters() node "dpdk_process" will cost about 140ms each physical interface every 10s (DPDK_STATS_POLL_INTERVAL).
    main_thread will blocked N*140 ms when N physical interface in up state.
    if govpp send heartbeat message to VPP, main_thread will have chance delay to read msg and reply, when main_thread blocked by doing update_counters.
    link between GoVPP and VPP will turn down when delay time more than 250ms. It is easy to reproduce the scenario.
    is there any plan to fix it or some suggestion to avoid it? Many thanks!

env details:
    GoVPP:v0.3.5
    DPDK version: 20.05
    VPP version:20.09
    centos7 + Intel X710
expansion-rom-version:
bus-info: 0000:19:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

    startup.conf dpdk uio-driver vfio_pci
    driver: i40evf version: 3.2.2-k

B&R,
Ruitao
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