Comment # 25 on bug 1220290 from Giovanni Gherdovich

Created attachment 873558 [details]
Update monitoring script. Reads /proc/interrupts and /proc/softirqs

Hello Rory,

I'm happy that 15.6 beta works for you, but since 15.5 is going to be supported
until December 2024, I'd like to at least check if the interrupt hypothesis
holds water.
That is, if it's actually the high number of interrupts that keep the cpu
active and prevent it from going idle, resulting in high average clock
frequency.
Of course that is contingent on you having time and opportunity to gather data.
No obligation.

If you agree to proceed, first we need to establish the kernel versions we're
going to test.

There are two Leap 15.5 kernels I'm interested in:

- kernel-default-5.14.21-150500.53.2.x86_64.rpm
  This is the stock kernel that comes with a fresh Leap 15.5 installation, and
is the one you used when you sent data at comment 6 and comment 7.
  It is found in the repository
http://download.opensuse.org/distribution/leap/15.5/repo/oss

- kernel-default-5.14.21-150500.55.52.1.x86_64.rpm
  This is the latest kernel update for Leap 15.5, released last March 6.
  It is found in the repository
http://download.opensuse.org/update/leap/15.5/sle

Then I'llask you to install kernel headers matching these versions (I suspect
the errors at comment 13 and comment 23 are due to the headers version not
matching the kernel version), and run the attached script on both.

Here are the steps:

1. [Check the zypper repositories]
   Make sure you have the "Leap 15.5 OSS" and "SLE 15.5 Update" repositories
enabled. It is generally the case, but best be sure. You'll check that with the
command:

   $ zypper repos --uri

   Among all repositories in the list, you should see two with the urls I
mentioned above. If you don't, add them like so:

   $ zypper addrepo
http://download.opensuse.org/distribution/leap/15.5/repo/oss
openSUSE-Leap-15.5-Oss
   $ zypper addrepo http://download.opensuse.org/update/leap/15.5/sle
repo-sle-update
   $ zypper refresh

2. [Search kernels using the "--details" option]
   Search for the two kernels we need, ie the initial Leap 15.5 kernel and the
latest update:

   $ zypper search --type package --details /^kernel-default$/

   Since we're giving the "--details" option, we'll be seeing all versions, no
only the latest one. The output should resemble the following:

   S  | Name           | Type    | Version                 | Arch   |
Repository
  
---+----------------+---------+-------------------------+--------+-----------------------
   v  | kernel-default | package | 5.14.21-150500.55.52.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.49.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.44.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.39.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.36.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.31.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.28.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.22.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.19.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.12.1  | x86_64 |
repo-sle-update
   v  | kernel-default | package | 5.14.21-150500.55.7.1   | x86_64 |
repo-sle-update
   i  | kernel-default | package | 5.14.21-150500.53.2     | x86_64 |
openSUSE-Leap-15.5-Oss

   In the first column, "i" means "installed", "v" means "a different version
is installed". Unlike other packages, there can be multiple versions of the
kernel installed at the same time.

3. [Install kernels]
   Install (if they aren't already) the first and last of that list, meaning
the initial 15.5 kernel and the latest update. This part is tricky! You'll need
to specify both the package name (kernel-default, second column) and the
version (fourth column). The way you do that is joining the name and the
version with a "dash" sign (-), like so:

   $ zypper install kernel-default-5.14.21-150500.53.2
   $ zypper install kernel-default-5.14.21-150500.55.52.1

4. [Search with "--details" and install kernel headers with matching versions]
   Search for, and install, the kernel-default-devel packages (which contains
kernel headers, needed for that script to collect interrupt data) with version
matching those of the kernels we just installed. Again, I think a version
mismatch between kernel and headers is the reason of the errors at comment 13
and comment 23. Very similar process as before:

   $ zypper search --type package --details /^kernel-default-devel$/
   $ zypper install kernel-default-devel-VERSION-GOES-HERE

5. [Collect data for kernel 5.14.21-150500.53.2]
   Reboot, and use the grub menu to select the 5.14.21-150500.53.2 kernel. Run
the attached script, which should hopefully work. Attach the .tgz file it
produces.

6. [Collect data for kernel 5.14.21-150500.55.52.1]
   Same story for the other kernel (latest update). Attach the result.

7. [Collect system information with "supportconfig"]
   There is a script that generates a summary of the machine hardware and
configuration. It's from the "supportutils" package. The command is
"supportconfig". Please run it and attach the result.