about 'latency-performance' on Ubuntu 20
 

I found that 'tuned-adm profile latency-performance' is not work on Ubuntu 20.

because of latency-performance need to set kernel
sched_min_granularity_ns = 10000000
sched_migration_cost_ns = 5000000

but While with kernel 5.13, these variables is missing.

according to

https://forum.endeavouros.com/t/sysc...5-13-why/17097

and I try to set these on /sys/kernel/debug/sched
but it is useless.

so how can I use latency-performance on Ubuntu 20.

Re: about 'latency-performance' on Ubuntu 20
 

may be I was wrong.
I got another server which latency-performance is normal on ubuntu 20.
so I dont know what different between them.

Re: about 'latency-performance' on Ubuntu 20
 

Kernel version differences would do this.
Provide the kernel information and check the differences in the two along with the server specifications, like CPU and such.

Re: about 'latency-performance' on Ubuntu 20
 

both are i9 12900k

different:
normal:Linux version 5.13.0-40-generic (buildd@ubuntu)
useless:Linux version 5.13.0-30-generic (buildd@ubuntu)

and now I remake the useless one to Linux version 5.4.0-65-generic (buildd@lcy01-amd64-018)
downloading csgo srcds now.

after remake the system, it is ok now.

Re: about 'latency-performance' on Ubuntu 20
 

hello, I have the same problem,
I use ubuntu 20.04,
kernel installed: Linux version 6.3.7-x64v1-xanmod1 (root@mascote) (gcc-12 (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 ) #0~20230609.ad1a983 SMP PREEMPT_DYNAMIC Fri Jun 9 21:38:08 UTC

how to solve this problem?
2023-06-14 00:16:42,316 ERROR tuned.utils.commands: Executing sysctl error: sysctl: cannot stat /proc/sys/kernel/sched_min_granularity_ns: No such file or directory
2023-06-14 00:16:42,340 ERROR tuned.utils.commands: Executing sysctl error: sysctl: cannot stat /proc/sys/kernel/sched_migration_cost_ns: No such file or directory

Re: about 'latency-performance' on Ubuntu 20
 

Use an older version or compile the kernel yourself with changes to allow for it. You can also safely ignore those errors.

Make a report here for help regarding the kernel.
https://github.com/xanmod/linux