linux-kernel - Re: Scheduler benchmarks

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Date:   Tue, 18 Aug 2020 16:36:33 +0200
From:   Greg KH <greg@...ah.com>
To:     Muni Sekhar <munisekharrms@...il.com>
Cc:     kernelnewbies <kernelnewbies@...nelnewbies.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: Scheduler benchmarks

On Tue, Aug 18, 2020 at 08:00:11PM +0530, Muni Sekhar wrote:
> Hi all,
> 
> I’ve two identical Linux systems with only kernel differences.

What are the differences in the kernels?

> While doing kernel profiling with perf, I got the below mentioned
> metrics for Scheduler benchmarks.
> 
> 1st system (older kernel version compared to the other system) benchmark result:
> 
> $ perf bench sched messaging -g 64
> # Running 'sched/messaging' benchmark:
> # 20 sender and receiver processes per group
> # 64 groups == 2560 processes run
> 
>      Total time: 2.936 [sec]
> 
> 
> 2nd system benchmark result:
> 
> $ perf bench sched messaging -g 64
> # Running 'sched/messaging' benchmark:
> # 20 sender and receiver processes per group
> # 64 groups == 2560 processes run
> 
>      Total time: 10.074 [sec]
> 
> 
> So as per scheduler benchmark results, clearly a huge difference
> between two systems.
> Can anyone suggest to me how to dive deeper to know the root cause for
> it.

Look a the differences between your different kernels, that would be a
great start :)

good luck!

greg k-h