[GitHub] [cloudstack] weizhouapache commented on issue #6680: Agent unable to retrieve CPU Speed of host after upgrading to 4.17.0.1

[GitBox <gi...@apache.org>]

weizhouapache commented on issue #6680:
URL: https://github.com/apache/cloudstack/issues/6680#issuecomment-1235153443

   > @shwstppr
   > 
   > Will try to give as much inforamtion as possible:
   > 
   > lscpu
   > 
   > ```
   > Architecture:                    x86_64
   > CPU op-mode(s):                  32-bit, 64-bit
   > Byte Order:                      Little Endian
   > Address sizes:                   48 bits physical, 48 bits virtual
   > CPU(s):                          48
   > On-line CPU(s) list:             0-47
   > Thread(s) per core:              2
   > Core(s) per socket:              24
   > Socket(s):                       1
   > NUMA node(s):                    1
   > Vendor ID:                       AuthenticAMD
   > CPU family:                      25
   > Model:                           1
   > Model name:                      AMD EPYC 7413 24-Core Processor
   > Stepping:                        1
   > Frequency boost:                 enabled
   > CPU MHz:                         2892.925
   > CPU max MHz:                     2650.0000
   > CPU min MHz:                     1500.0000
   > BogoMIPS:                        5289.83
   > Virtualization:                  AMD-V
   > ```
   > 
   > virsh nodeinfo
   > 
   > ```
   > CPU model:           x86_64
   > CPU(s):              48
   > CPU frequency:       1494 MHz
   > CPU socket(s):       1
   > Core(s) per socket:  24
   > Thread(s) per core:  2
   > NUMA cell(s):        1
   > Memory size:         263476088 KiB
   > ```
   > 
   > virsh sysinfo
   > 
   > ```
   > <sysinfo type='smbios'>
   >   <processor>
   >     <entry name='socket_destination'>CPU1</entry>
   >     <entry name='type'>Central Processor</entry>
   >     <entry name='family'>Zen</entry>
   >     <entry name='manufacturer'>AMD</entry>
   >     <entry name='signature'>Family 25, Model 1, Stepping 1</entry>
   >     <entry name='version'>AMD EPYC 7413 24-Core Processor</entry>
   >     <entry name='external_clock'>2000 MHz</entry>
   >     <entry name='max_speed'>3900 MHz</entry>
   >     <entry name='status'>Populated, Enabled</entry>
   >     <entry name='serial_number'>Not Specified</entry>
   >     <entry name='part_number'>Not Specified</entry>
   >   </processor>
   > </sysinfo>
   > ```
   > 
   > virsh capabilities
   > 
   > ```
   > <capabilities>
   >   <host>
   >     <cpu>
   >       <arch>x86_64</arch>
   >       <model>EPYC-Rome</model>
   >       <vendor>AMD</vendor>
   >       <microcode version='167776605'/>
   >       <counter name='tsc' frequency='2645030000'/>
   >       <topology sockets='1' cores='24' threads='2'/>
   >       <pages unit='KiB' size='4'/>
   >       <pages unit='KiB' size='2048'/>
   >       <pages unit='KiB' size='1048576'/>
   >     </cpu>
   >   </host>
   > </capabilities>
   > ```
   > 
   > The problem in this case might be, that the availeable output seems to connected to the used module for the cpu. As mentioned above lscpu using the `intel_pstate` module will give different sets of results. Currently, as i am using a standard Ubuntu Server 20.04.5, the out-of-the-box used module is `acpi-cpufreq`. Which supports the `CPU max MHz`. On the horizon, when the kernel version 5.17 will be used, out-of-the-box we shall see the module `amd_pstat`... I don't know how important the "out-of-the-box" CPU discovery is for the cloudstack agent. Guess there would be a little script needed to check the loaded module and then "query" the intended value... How ever - depending on how important this is.
   
   thanks @Hudratronium 
   
   it looks we could get correct value by `lscpu` or `virsh capabilities`
   
   CPU max MHz:                     2650.0000
   
         <counter name='tsc' frequency='2645030000'/>
   
   
   


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