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  • 1.  Latency problem

    This message was posted by a user wishing to remain anonymous
    Posted 28 days ago
    This message was posted by a user wishing to remain anonymous

    Greetings. We have vSRX 3 VM hosted on VMware Cloud Director. The network productivity seems to be low, so we're investigating what causes it. Throughput is not the problem, vSRX forwards packets at about 2Gbps. On the other hand, packet latency is suspiciously inconsistent when traffic goes through the vSRX. This is how ping looks like on mostly idle VM:

    64 bytes from ( icmp_seq=84 ttl=63 time=0.970 ms
    64 bytes from ( icmp_seq=85 ttl=63 time=38.3 ms
    64 bytes from ( icmp_seq=86 ttl=63 time=0.934 ms
    64 bytes from ( icmp_seq=87 ttl=63 time=14.1 ms
    64 bytes from ( icmp_seq=88 ttl=63 time=227 ms
    64 bytes from ( icmp_seq=89 ttl=63 time=16.9 ms
    64 bytes from ( icmp_seq=90 ttl=63 time=0.830 ms
    64 bytes from ( icmp_seq=91 ttl=63 time=7.39 ms
    64 bytes from ( icmp_seq=92 ttl=63 time=166 ms
    64 bytes from ( icmp_seq=93 ttl=63 time=1.07 ms
    64 bytes from ( icmp_seq=94 ttl=63 time=230 ms
    64 bytes from ( icmp_seq=95 ttl=63 time=6.100 ms
    64 bytes from ( icmp_seq=96 ttl=63 time=124 ms
    64 bytes from ( icmp_seq=97 ttl=63 time=0.807 ms
    64 bytes from ( icmp_seq=98 ttl=63 time=71.4 ms
    64 bytes from ( icmp_seq=99 ttl=63 time=1.02 ms
    64 bytes from ( icmp_seq=100 ttl=63 time=88.7 ms

    --- ping statistics ---
    100 packets transmitted, 100 received, 0% packet loss, time 99620ms
    rtt min/avg/max/mdev = 0.688/53.242/234.987/67.991 ms

    So far we tried the following:

    • Run VM with the minimal number of NICs.
    • Run VM with the minimal config.
    • Scale hardware: VSRX-2CPU-4G→VSRX-5CPU-8G→VSRX-9CPU-16G→...
    • NUMA affinity settings.
    • Check logs/console messages - nothing weird.
    • Check if there any resource shortage - seems to be ok.
    • vSRX version on this hosting is 4 years old - 20.2R1.10 by builder on 2020-06-25 13:14:24 UTC, we're going to update it, so maybe it'll help.

    Do you have any ideas what else can we check? Can latency be caused by the physical host's CPU overprovisioning?