What were you trying to do that didn't work?

Set the value for parameter vm.max_map_count to 2147483647 when switching to tuned profile sap-netweaver on a system which does not contain vm.max_map_count in a file in directory /etc/sysctl.d

Please provide the package NVR for which bug is seen:

tuned-profiles-sap-2.20.0-1.el9

How reproducible:

Always

Steps to reproduce

1. Ensure that the parameter vm.max_map_count is not in any file in /etc/sysctl.d:
2. cd /etc/sysctl.d
3. grep -rn vm.max_map_count
4. echo $?
   1
5. Install tuned-profiles-sap:
6. dnf install tuned-profile-sap
7. Switch to tuned profile sap-netweaver:
8. tuned-adm profile sap-netweaver
9. Display the value of vm.max_map_count:
10. sysctl vm.max_map_count
    vm.max_map_count = 2000000

Expected results

According to applicable SAP notes for RHEL 8 and RHEL 9, vm.max_map_count is to be set to 2147483647. This is currently implemented in the RHEL System Roles for SAP for both RHEL releases, by configuring the file /etc/sysctl.d/sap.conf accordingly.

But when using the tuned profile sap-netweaver and the parameter vm.max_map_count is not set in a flie in /etc/sysctl.d, the parameter vm.max_map_count also needs to be set to the correct value of 2147483647.

So the tuned profile sap-netweaver needs to be updated from:

vm.max_map_count = 2000000

to:

vm.max_map_count = 2147483647

Actual results

The file /usr/lib/tuned/sap-netweaver/tuned.conf contains in the [sysctl] section:
vm.max_map_count = 2000000

When running "tuned-adm profile sap-netweaver" for switching to this profile on a RHEL 9.2 system which has the file /etc/sysctl.d/sap.conf with the following line:
vm.max_map_count=2147483647

, the setting of vm.max_map_count will remain on the value of 2147483647, meaning it will not be lowered to 2000000.

The corresponding entry in file /var/log/tuned/tuned.log is:

2024-04-04 11:14:34,245 INFO     tuned.plugins.plugin_sysctl: Overriding sysctl parameter 'vm.max_map_count' from '2000000' to '2147483647'

But when using the tuned profile sap-netweaver and the parameter vm.max_map_count is not set in a file in /etc/sysctl.d, the parameter vm.max_map_count will be set to the wrong value of 2000000.