<![CDATA[Bad Performance CPU? get-cpufreq-para failed]]>Hi @ all,
I am using since about ten year Xenserver and tested it on several platforms.
It runs on all configuration i have every tried and the most of it are not build for such usage.

2 weeks ago I have get an ProLiant DL380p Gen8 with two E5-2680.
At first nothing unusual during installation an migration. But then I tested some Windows 10 VMs and there are extremely slow. I comparison to another system they are about ten times slower.

after some research in the forum I have found the following topic:

xcp-ng CPU low performance issue

If I want to get some CPU information i will get this:

[07:18 localhost ~]# sudo xenpm get-cpufreq-para
[CPU0] failed to get cpufreq parameter
[CPU1] failed to get cpufreq parameter
[CPU2] failed to get cpufreq parameter
...
[CPU62] failed to get cpufreq parameter
[CPU63] failed to get cpufreq parameter

It seem to be xen can´t get clean access to the CPU?

[12:47 localhost ~]# cat /proc/cpuinfo | grep -i mhz
cpu MHz: 2693.528
cpu MHz: 2693.528
cpu MHz: 2693.528
cpu MHz: 2693.528
cpu MHz: 2693.528
…

Are there anyone who has solved such a problem?

]]>https://xcp-ng.org/forum/topic/8423/bad-performance-cpu-get-cpufreq-para-failedRSS for NodeSat, 18 Apr 2026 16:17:49 GMTTue, 20 Feb 2024 07:58:26 GMT60<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Wed, 06 Mar 2024 06:57:07 GMT]]>@high-voltages you also can try xenpm start 10 to gather info for 10s and it will print a sumarry at the end, in my case it had each core average frequency, not sure you'll get it too, but you can give it a shot.

]]>https://xcp-ng.org/forum/post/73000https://xcp-ng.org/forum/post/73000Wed, 06 Mar 2024 06:57:07 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Fri, 01 Mar 2024 12:47:13 GMT]]>@high-voltages so nothing there hints you to a problem with the drive SDA on the slow "host"?

]]>https://xcp-ng.org/forum/post/72649https://xcp-ng.org/forum/post/72649Fri, 01 Mar 2024 12:47:13 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Tue, 27 Feb 2024 16:19:31 GMT]]>Thanks for the Feedback @ all

I have tested some commands from above and discovered something

a good working host system:

iostat -x
Linux 4.19.0+1 (xcpngautewe)    02/27/2024      _x86_64_        (8 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.18    0.00    0.34    0.00    0.07   99.41

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
nvme0n1           0.04     0.08    2.02    2.50   135.07   202.56   149.24     0.00    0.30    0.27    0.32   0.21   0.10
sda               0.08     0.81    2.29    3.26   126.80   161.85   104.05     0.00    0.57    0.69    0.48   0.29   0.16
dm-0              0.00     0.00    0.00    0.00     0.47     0.00   244.40     0.00    0.81    0.82    0.00   0.81   0.00
dm-1              0.00     0.00    0.00    0.00     0.33     0.00   215.58     0.00    0.86    0.91    0.04   0.86   0.00
dm-2              0.00     0.00    0.00    0.00     0.00     0.00    21.18     0.00    0.19    0.16    0.23   0.19   0.00
dm-3              0.00     0.00    0.21    0.21    12.58    11.83   117.71     0.00    0.71    0.97    0.46   0.33   0.01
tda               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00    0.55    0.55    0.00   0.15   0.00
tdb               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00    0.55    0.55    0.00   0.15   0.00

in comparison to the slow host system:

iostat -x
Linux 4.19.0+1 (localhost.localdomain)  02/27/2024      _x86_64_        (16 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.29    0.00    0.53    0.02    0.03   99.13

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sda               0.14     0.91    6.54    7.67   308.70   284.24    83.43     0.10    7.15    3.08   10.62   2.96   4.21
sdb               0.00     0.00    0.01    0.00     1.33     0.00   254.01     0.00    1.61    1.61    7.25   1.60   0.00
dm-0              0.00     0.00    0.00    0.00     0.54     0.00   253.31     0.00    1.78    1.73   34.50   1.76   0.00
dm-5              0.00     0.00    0.20    0.17    20.11     2.27   119.98     0.00    4.71    0.91    9.28   2.41   0.09
tdc               0.00     0.00    0.00    0.00     0.04     0.00    81.29     0.00   27.58   27.58    0.00   7.40   0.00
sdc               0.00     0.00    0.01    0.00     0.53     0.00   126.86     0.00    4.08    4.08    0.00   2.24   0.00
dm-1              0.00     0.00    1.26    1.76    49.67    39.38    59.01     0.02    5.22    2.67    7.05   4.00   1.21
dm-2              0.00     0.00    0.12    0.14    21.73    24.61   345.21     0.00    9.35    4.45   13.56   3.18   0.09
dm-3              0.00     0.00    0.11    0.00     2.20     0.00    41.97     0.00    0.97    0.97    0.00   0.84   0.01
dm-4              0.00     0.00    0.27    0.00    12.30     0.00    90.10     0.00    3.15    3.15    0.00   2.56   0.07
tda               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00    2.42    2.42    0.00   1.28   0.00
tdb               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00    0.60    0.60    0.00   0.23   0.00
dm-6              0.00     0.00    0.11    0.10     5.00     4.04    87.11     0.00    6.31    2.74   10.09   3.63   0.08
tdd               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00    0.53    0.53    0.00   0.38   0.00
dm-7              0.00     0.00    0.04    0.00     1.96     0.04    88.39     0.00    4.69    4.02   15.47   3.11   0.01
tde               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00    0.57    0.57    0.00   0.38   0.00
dm-8              0.00     0.00    0.00    0.00     0.00     0.00    45.15     0.00   11.98    7.87   20.20  10.80   0.00
dm-9              0.00     0.00    0.00    0.00     0.00     0.00    38.85     0.00   12.60    6.04   23.95  11.96   0.00
dm-10             0.00     0.00    0.07    0.04     1.97     1.26    58.93     0.00   10.88    7.96   15.34   2.78   0.03
dm-11             0.00     0.00    0.00    0.00     0.00     0.00    28.84     0.00   12.16   12.16    0.00   7.12   0.00
dm-12             0.00     0.00    0.00    0.00     0.00     0.00    41.06     0.00   10.25   10.25    0.00   6.90   0.00
dm-13             0.00     0.00    0.00    0.00     0.00     0.00    54.52     0.00    5.10    5.10    0.00   5.02   0.00
dm-14             0.00     0.00    0.04    0.00     1.36     0.00    67.46     0.00    4.38    4.38    0.00   2.27   0.01
dm-15             0.00     0.00    0.01    0.00     0.12     0.00    48.19     0.00    7.59    7.59    0.00   6.14   0.00
tdf               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00   48.68   48.68    0.00   7.17   0.00
tdg               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00   30.45   30.45    0.00   4.98   0.00
tdh               0.00     0.00    0.00    0.00     0.00     0.00    39.09     0.00    1.45    1.45    0.00   0.60   0.00

the columns with the wait timings are much higher than the from the fast host
that’s very strange from my point of view.

further the CPU stat does not shows correct values because the fast host was at the time of the command under heavy load with about 80%.

on the slow was some load but there the CPU is much stronger

@bleader: the comand "get-cpufreq-average" gives no output at all.

]]>https://xcp-ng.org/forum/post/72309https://xcp-ng.org/forum/post/72309Tue, 27 Feb 2024 16:19:31 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Fri, 23 Feb 2024 07:47:53 GMT]]>In guests (even privileded guest like dom0), /proc/cpuinfo reports only what xen exposes to it, it generally is shown as fixed value.

You can only get some more insight using xenpm when it actually shows something. I found it commonly having parts working or not depending on the CPU. On a xeon here, I get the same as you with get-cpufreq-para but you can have a look at get-cpufreq-average which is generally working, here you can see the frequency moving, on an idle machine it should be lower, and get higher with load.

Hope this helps.

]]>https://xcp-ng.org/forum/post/72046https://xcp-ng.org/forum/post/72046Fri, 23 Feb 2024 07:47:53 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Thu, 22 Feb 2024 14:33:52 GMT]]>@high-voltages I believe turbo boost takes it up to 3.3GHz. The 2.7 is reduced workload

]]>https://xcp-ng.org/forum/post/71992https://xcp-ng.org/forum/post/71992Thu, 22 Feb 2024 14:33:52 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Thu, 22 Feb 2024 13:55:51 GMT]]>What's the load average on your Dom0? What's the current resources allocated to it? (vCPUs and memory)? Might be interesting to check also the load on the SR (eg with iostat -x)

]]>https://xcp-ng.org/forum/post/71983https://xcp-ng.org/forum/post/71983Thu, 22 Feb 2024 13:55:51 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Thu, 22 Feb 2024 13:48:38 GMT]]>@Affonso thanks for this...

doese the cpu boost the frequency on load or is the cpu permanetly on 2,7ghz

]]>https://xcp-ng.org/forum/post/71980https://xcp-ng.org/forum/post/71980Thu, 22 Feb 2024 13:48:38 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Thu, 22 Feb 2024 13:54:21 GMT]]>@olivierlambert
Ok no proplem.

Servertype: HP ProLiant DL380p Gen8
CPU 2 x Xeon(R) CPU E5-2680 0 @ 2.70GHz

RAM 128GB DDR3 1333Mhz ECC RAM

Storage 8x 900GB SAS 10K Disks at P420i Raid Controller
Configured as:
1x 1,8 TB RAID 1+0 (4 Disks)
1x 1,8 TB RAID 1+0 (4 Disks)

[11:55 localhost ~]# pvs
  PV         VG                                                 Fmt  Attr PSize  PFree  
  /dev/sda3  VG_XenStorage-76d8320a-18bd-1b29-4040-caf0361ce575 lvm2 a--  <1.60t 777.70g
  /dev/sdb   VG_XenStorage-76d8320a-18bd-1b29-4040-caf0361ce575 lvm2 a--  <1.64t  <1.64t

NIC 1xHP Ethernet 1Gb 4-port 331FLR Adapter (4x1Gbit/s)

  • Nic0 = Management
  • Nic1 + Nic2 = Bond for VM
  • Nic3 = Storage Network for Backup
    Actual active VMs 1x Win10 4x vCPU 8GB RAM
    1x Win10 4x vCPU 8GB RAM
    1x Win10 4x vCPU 16GB RAM
    1x Win10 4x vCPU 8GB RAM (temporary fresh installed for testing)
]]>https://xcp-ng.org/forum/post/71979https://xcp-ng.org/forum/post/71979Thu, 22 Feb 2024 13:54:21 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Thu, 22 Feb 2024 12:20:59 GMT]]>This also happens on our servers.

This is from a single node homelab running on a Dell PowerEdge r620

# xenpm get-cpufreq-para
[CPU0] failed to get cpufreq parameter
[CPU1] failed to get cpufreq parameter
[CPU2] failed to get cpufreq parameter
[CPU3] failed to get cpufreq parameter
[CPU4] failed to get cpufreq parameter
[CPU5] failed to get cpufreq parameter
[CPU6] failed to get cpufreq parameter
[CPU7] failed to get cpufreq parameter
[CPU8] failed to get cpufreq parameter
[CPU9] failed to get cpufreq parameter
[CPU10] failed to get cpufreq parameter
[CPU11] failed to get cpufreq parameter
[CPU12] failed to get cpufreq parameter
[CPU13] failed to get cpufreq parameter
[CPU14] failed to get cpufreq parameter
[CPU15] failed to get cpufreq parameter
[CPU16] failed to get cpufreq parameter
[CPU17] failed to get cpufreq parameter
[CPU18] failed to get cpufreq parameter
[CPU19] failed to get cpufreq parameter
[CPU20] failed to get cpufreq parameter
[CPU21] failed to get cpufreq parameter
[CPU22] failed to get cpufreq parameter
[CPU23] failed to get cpufreq parameter
[CPU24] failed to get cpufreq parameter
[CPU25] failed to get cpufreq parameter
[CPU26] failed to get cpufreq parameter
[CPU27] failed to get cpufreq parameter
[CPU28] failed to get cpufreq parameter
[CPU29] failed to get cpufreq parameter
[CPU30] failed to get cpufreq parameter
[CPU31] failed to get cpufreq parameter
[CPU32] failed to get cpufreq parameter
[CPU33] failed to get cpufreq parameter
[CPU34] failed to get cpufreq parameter
[CPU35] failed to get cpufreq parameter
[CPU36] failed to get cpufreq parameter
[CPU37] failed to get cpufreq parameter
[CPU38] failed to get cpufreq parameter
[CPU39] failed to get cpufreq parameter
[CPU40] failed to get cpufreq parameter
[CPU41] failed to get cpufreq parameter
[CPU42] failed to get cpufreq parameter
[CPU43] failed to get cpufreq parameter
[CPU44] failed to get cpufreq parameter
[CPU45] failed to get cpufreq parameter
[CPU46] failed to get cpufreq parameter
[CPU47] failed to get cpufreq parameter

# cat /proc/cpuinfo | egrep -i mhz
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
cpu MHz		: 2700.059
]]>https://xcp-ng.org/forum/post/71972https://xcp-ng.org/forum/post/71972Thu, 22 Feb 2024 12:20:59 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Thu, 22 Feb 2024 08:48:50 GMT]]>You must provide more technical details on the entire system/setup, including the storage & network.

]]>https://xcp-ng.org/forum/post/71954https://xcp-ng.org/forum/post/71954Thu, 22 Feb 2024 08:48:50 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Wed, 21 Feb 2024 21:33:17 GMT]]>that is correct, but there are no errors in the storage system. the raid is built with two Raid 10 arrays SAS disks. the performance should be there.

a better question should be, how to figure it out driver issues?
The issue with the CPU looks strange and i don´t know how to find out why the cpu data could be not show with xenpm

I think I will make some test with a linux vm look how the performance is there.

]]>https://xcp-ng.org/forum/post/71936https://xcp-ng.org/forum/post/71936Wed, 21 Feb 2024 21:33:17 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Wed, 21 Feb 2024 15:49:29 GMT]]>It's hard to tell, you have the infrastructure "in front of you", while I have 0 knowledge here.

]]>https://xcp-ng.org/forum/post/71893https://xcp-ng.org/forum/post/71893Wed, 21 Feb 2024 15:49:29 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Wed, 21 Feb 2024 15:17:25 GMT]]>@olivierlambert I think it could be both... but how can i figure it out where are the this came from?

it is a fresh installed system.

]]>https://xcp-ng.org/forum/post/71888https://xcp-ng.org/forum/post/71888Wed, 21 Feb 2024 15:17:25 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Tue, 20 Feb 2024 10:08:04 GMT]]>So your issue is probably more storage related than CPU related

]]>https://xcp-ng.org/forum/post/71756https://xcp-ng.org/forum/post/71756Tue, 20 Feb 2024 10:08:04 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Tue, 20 Feb 2024 10:04:00 GMT]]>I have checked the BIOS: PowerManament is set to static Performance
there was no change...

the CPU parameter are still not avail

further the HDD load in the VM is strange, the disk load is without any started app permanently at 100%

High Disk load without any started app:
e13417a8-8bbb-4252-9e49-d8f3a62b5a2e-image.png

high CPU load after start without any started app:
75eda7fc-fdf6-4bbd-809c-c1b173235620-image.png

]]>https://xcp-ng.org/forum/post/71755https://xcp-ng.org/forum/post/71755Tue, 20 Feb 2024 10:04:00 GMT<![CDATA[Reply to Bad Performance CPU? get-cpufreq-para failed on Tue, 20 Feb 2024 08:09:34 GMT]]>Hi,

Check in your BIOS that you are in performance mode or equivalent.

]]>https://xcp-ng.org/forum/post/71748https://xcp-ng.org/forum/post/71748Tue, 20 Feb 2024 08:09:34 GMT