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Halano

Member

From: Egypt

Registered: 2023-02-07

Posts: 72

Website

[SOLVED] Verifying sched_ext schedulers on 6.12

Just upgrade and installed these packages

linux
linux-headers
scx-scheds
bpf

How to verify that sched_ext been in use or active should I start scx.service
Or
Edit

/sys/block/sda/queue/scheduler

As Improving_performance wiki print
?!

Last edited by Halano (2024-12-02 14:13:05)

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.:HalanoTheSmartMoth:.

loqs

Member

Registered: 2014-03-06

Posts: 18,859

Re: [SOLVED] Verifying sched_ext schedulers on 6.12

Have you read through https://github.com/sched-ext/scx/blob/main/README.md?  Which should answer some of your questions.

/sys/block/sda/queue/scheduler

Is the IO scheduler for the block device sda and not related to CPU scheduling.

Halano

Member

From: Egypt

Registered: 2023-02-07

Posts: 72

Website

Re: [SOLVED] Verifying sched_ext schedulers on 6.12

Have you read through https://github.com/sched-ext/scx/blob/main/README.md?  Which should answer some of your questions.

Thanks I read README.md & got some useful informations , as Im not technical in kernel schedulers
friends recommend to use it for better performance and yet I still can't verify if it's in use or EEVDF that running

[root@archlinux tmp]#  scx_bpfland 
15:36:38 [INFO] scx_bpfland 1.0.6-g607dfab7-dirty x86_64-unknown-linux-gnu SMT off
15:36:38 [INFO] primary CPU domain = 0x3
15:36:38 [INFO] cpufreq performance level: auto
15:36:38 [INFO] L2 cache ID 0: sibling CPUs: [0, 1]
15:36:38 [INFO] L3 cache ID 0: sibling CPUs: [0, 1]
Error: another sched_ext scheduler is already running
[root@archlinux tmp]# 

[root@archlinux tmp]#  scx_bpfland --monitor 0.5
[scx_bpfland] tasks -> r:  2/2  i: 0  | dispatch -> k: 0     d: 0     s: 18   
[scx_bpfland] tasks -> r:  1/2  i: 0  | dispatch -> k: 6     d: 145   s: 34   
[scx_bpfland] tasks -> r:  2/2  i: 0  | dispatch -> k: 7     d: 135   s: 34   
[scx_bpfland] tasks -> r:  1/2  i: 0  | dispatch -> k: 7     d: 170   s: 49   
[scx_bpfland] tasks -> r:  2/2  i: 0  | dispatch -> k: 3     d: 133   s: 36   

[root@archlinux tmp]#   scx_rustland 
Error: another sched_ext scheduler is already running

Also I don't know what the different between these scx_* tools
maybe because I enabled scx.service

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.:HalanoTheSmartMoth:.

loqs

Member

Registered: 2014-03-06

Posts: 18,859

Re: [SOLVED] Verifying sched_ext schedulers on 6.12

# cat /sys/kernel/sched_ext/state /sys/kernel/sched_ext/*/ops 2>/dev/null

Follow https://github.com/sched-ext/scx/tree/main/scheds for an explanation of each scheduler. Unless the scheduler is the performance bottleneck how will swapping scheduler improve performance?

Last edited by loqs (2024-12-02 13:57:47)

Halano

Member

From: Egypt

Registered: 2023-02-07

Posts: 72

Website

Re: [SOLVED] Verifying sched_ext schedulers on 6.12

how will swapping scheduler improve performance?

as Im not technical in kernel schedulers friends recommend

https://github.com/sched-ext/scx/tree/main/scheds

I get it and knowing which one is currently running thanks for help.

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.:HalanoTheSmartMoth:.