xcp-ng CPU low performance issue

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  • enes.selcuk

    Hi,
    Dell r740 server SILVER 4210 processor headlight, but after installing xcp-ng operating system hypervisor operating system and virtualized windows and linux environments can not reach the CPU max value. I have checked all the performance settings in the BIOS, but unfortunately there is no solution. Note: it can reach maximum CPU value when it is checked by installing windows operating system directly on the current server.

    Intel Xeon Silver 4216
    22M Cache, 2,10 GHz
    xcp-ng 8.0.0

    I tested all the next version.
    https://support.citrix.com/article/CTX200390#.VMjt9xm-SpE.twitter
    https://wiki.xenproject.org/wiki/Xenpm_command
    http://blog.blazis.com/how-to-enable-cpu-frequency-scaling-on-xenserver/
    https://support.citrix.com/article/CTX200390

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  • Danp

    How are you testing? Also, might help if you told us the results. 😉

    0
  • enes.selcuk

    @Danp said in xcp-ng CPU low performance issue:

    How are you testing? Also, might help if you told us the results.

    [19:10 xcp-ng-lmtguftk ~]# sudo xenpm get-cpufreq-para
    cpu id : 0
    affected_cpus : 0
    cpuinfo frequency : max [2101000] min [800000] cur [2101000]
    scaling_driver : acpi-cpufreq
    scaling_avail_gov : userspace performance powersave ondemand
    current_governor : performance
    scaling_avail_freq : *2101000 2100000 2000000 1900000 1800000 1700000 1600000 150 0000 1400000 1300000 1200000 1100000 1000000 900000 800000
    scaling frequency : max [2101000] min [800000] cur [2101000]
    turbo mode : enabled

    max 2.10 ghz but The processor can go up to 3.2 GHz under normal conditions.

    xenpm start & sleep 5; killall -s SIGINT xenpm

    The maximum speed of the task manager on windows is 2.10ghz.

    T 1 Reply 0
  • T

    @enes-selcuk

    What's the output of:

    # xenpm start 1 | grep -i "avg freq"
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  • enes.selcuk

    @tuxen said in xcp-ng CPU low performance issue:

    xenpm start 1 | grep -i "avg freq"

    [06:13 xcp-ng-lmtguftk ~]# xenpm start 1 | grep -i "avg freq"
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz
    Avg freq 64 KHz

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  • enes.selcuk

    ll performance settings in the server bios settings are as follows.

    System Profile Current Value Pending Value
    CPU Power Management System DBPM (DAPC)
    Memory Frequency Maximum Performance
    Turbo Boost Enabled
    C1E Enabled
    C States Enabled
    Write Data CRC Disabled
    Memory Patrol Scrub Standard
    Memory Refresh Rate 1x
    Uncore Frequency Dynamic
    Energy Efficient Policy Balanced Performance
    Number of Turbo Boost Enabled Cores for Processor 1 All
    Number of Turbo Boost Enabled Cores for Processor 2 All
    Monitor/Mwait Enabled
    Workload Profile Not Available
    CPU Interconnect Bus Link Power Management Enabled
    PCI ASPM L1 Link Power Management Enabled

    CPU Power Management Some options include = Performans Per Watt (OS ), Performans Per Watt (DAPC ), Performance, Workstation Performans, Custom
    Workload Profile Some options include = HPC Profile =,Low Latency Optimized Prodile, Virtualization Optimized Performans Profile, Virtualization Optimized Performans Per Watt Profile, Database Optimized Performans Profile, Database Optimized Performans Per Watt Profile, SDS Optimized Performans Profile and SDS Optimized Performans Per Watt Profile
    I have tried the above options one by one but the result has not changed.

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  • T

    The incorrect clock results mean that Xen isn't in charge of frequency scaling management. Set the CPU Power Management to Performance Per Watt (OS) and run the previous xenpm, this time with a watch for real-time:

    # watch 'xenpm start 1 | grep -i "avg freq"'

    Start a VM boot storm (or a stress test inside one or more VMs) in order to generate some CPU load.

    T 1 Reply 1
  • T

    @enes-selcuk

    This is one of our production servers with the CPU Power Management config I posted earlier. It's a Dell R730 - Xeon E5-2630v3 @ 2.40 Ghz. As you can see, some cores are boosting to 3.0-3.1GHz. The maximum for this CPU model is 3.2 GHz:

      Avg freq	2737140	KHz
  Avg freq	2737140	KHz
  Avg freq	2689120	KHz
  Avg freq	2665110	KHz
  Avg freq	2737140	KHz
  Avg freq	3097290	KHz
  Avg freq	3073280	KHz
  Avg freq	2713130	KHz
  Avg freq	2665110	KHz
  Avg freq	2641100	KHz
  Avg freq	2761150	KHz
  Avg freq	2665110	KHz
  Avg freq	2689120	KHz
  Avg freq	2617090	KHz
  Avg freq	2881200	KHz
  Avg freq	2785160	KHz
  Avg freq	2641100	KHz
  Avg freq	2713130	KHz
  Avg freq	2689120	KHz
  Avg freq	2689120	KHz
  Avg freq	2689120	KHz
  Avg freq	2785160	KHz
  Avg freq	2833180	KHz
  Avg freq	2761150	KHz
  Avg freq	2761150	KHz
  Avg freq	2905210	KHz
  Avg freq	2713130	KHz
  Avg freq	3025260	KHz
  Avg freq	2761150	KHz
  Avg freq	2713130	KHz
  Avg freq	2833180	KHz
  Avg freq	2617090	KHz
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  • enes.selcuk

    @tuxen said in xcp-ng CPU low performance issue:

    Start a VM boot storm (or a stress test inside one or more VMs) in order to generate some CPU load.

    Thank you very much for your information. I tried and saw the following results in real time.Every 2,0s: xenpm start 1 | grep -i "avg freq" Thu Nov 28 13:27:00 2019

    Avg freq 2521200 KHz
    Avg freq 2689280 KHz
    Avg freq 2836350 KHz
    Avg freq 2689280 KHz
    Avg freq 2731300 KHz
    Avg freq 2689280 KHz
    Avg freq 2773320 KHz
    Avg freq 2752310 KHz
    Avg freq 2689280 KHz
    Avg freq 2689280 KHz
    Avg freq 2710290 KHz
    Avg freq 2710290 KHz
    Avg freq 2689280 KHz
    Avg freq 2710290 KHz

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  • ruskofd

    Try to disable C-States, it could also improve a lot of operations, including storage.

    enes.selcuk 1 Reply 1
  • enes.selcuk

    @ruskofd I turned off the C1E and C States features. Problem is solved. But SSD performance is very low compared to windows machine.

    0
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