@badraz

Thank you for your time, I think I finally fixed it. This is how:
First time I've installed XO from this guide: https://github.com/ronivay/XenOrchestraInstallerUpdater
I used Appliance version - prebuilt VM with XO installed. And there was a problem with negative values.

Now I've tried this guide: https://github.com/Jarli01/xenorchestra_updater
And instead of using prebuilt VM version, I ran Installation script on previously created Debian 10 VM. After script finish installing XO and all necessary libraries/dependencies, I've all telemetry working properly.

@badraz @olivierlambert

xo-cli host.stats host=

Ok, here is output of this command (I've trimmed CPU section). I can see negative values on some CPUs.

"cpus": {
    ...
    "8": [
        4.55,
        4.55,
        5.93,
        -10.639999999999999,
        -6.2700000000000005,
        2.1399999999999997,
        0.9199999999999999,
        1.4000000000000001,
        12.3,
        14.14,
        -16.07,
        8.76,
        20.05,
        -18.98,
        2.6100000000000003,
        2.79,
        2.31,
        2.34,
        2.88,
        4.8500000000000005,
        3.1300000000000003,
        4.68,
        3.9800000000000004,
        3.9800000000000004,
        24.36,
        -16.42,
        2.26,
        5.5,
        2.44,
        1.16,
        4.26,
        6.3100000000000005,
        9.1,
        6.859999999999999,
        6,
        3.42,
        2.34,
        2.25,
        1.46,
        5.18,
        2.7,
        3.92,
        5.3100000000000005,
        6.909999999999999,
        7.88,
        3.6900000000000004,
        5.19,
        3.92,
        5.609999999999999,
        6.800000000000001,
        5.609999999999999,
        5.3,
        5.7700000000000005,
        6.0600000000000005,
        6.660000000000001,
        6.21,
        5.99,
        5.58,
        1.82,
        -0.03,
        3.2399999999999998,
        5.74,
        6.1,
        6.52,
        6.59,
        6.69,
        18.18,
        5.47,
        -14.74,
        10.03,
        14.44,
        -16.5,
        1.37,
        0.7100000000000001,
        -0.01,
        5.71,
        12.620000000000001,
        12.620000000000001,
        -26.369999999999997,
        -0.59,
        3.19,
        1.78,
        1.27,
        0.04,
        24.65,
        -18.81,
        -2.79,
        7.3,
        0.86,
        0.96,
        6.819999999999999,
        6.419999999999999,
        6,
        6.3,
        6.529999999999999,
        6.34,
        5.8999999999999995,
        6.619999999999999,
        19.72,
        6.38,
        -10.7,
        4.22,
        3.74,
        2.55,
        -1.01,
        -0.24,
        1.05,
        1.6,
        2.76,
        5.93,
        2.97,
        0.9299999999999999,
        1.73,
        4.18,
        6.13,
        5.7,
        3.9600000000000004,
        4.8,
        7.6899999999999995
    ],
    ...
}

Because this happens on my machine constantly, I can do some debugging/tests, just give me instructions.

Hi, guys! I have strange behaviour in Xen Orchestra - on host CPU usage graph (and sometimes on VM also, but really not that frequently) values goes to negative. Attaching screenshots. In Netdata UI everything seems to be fine. Where to dig? Thanx!

@ube hello! I have the same MoBo (Atermiter X79 turbo v1.3) and same problem with XCP-NG 8.2. Can't boot in regular mode, stops exactly at the same point. Mt CPU is little bit different - 2689 V1. I can boot only with nosmp flag (or dom0_max_vcpu=1-1), so basically there is something with multiprocessing. In BIOS multithreading is enabled and virtualisation too. With some testing tool (Memtest86 or AIDA) I do see processor info with 8 cores / 16 threads, also Hiren's BootCD PE boots fine into the portable windows.
Did you solve your problem somehow?

@olivierlambert hello! Can this error be related to CentOS? Is there a way to install XCP-NG on already installed CentOS? I'm just thinking of different ways of solving my issue.

Thanks!