linux-kernel - Re: [PATCH 00/30] PREEMPT_AUTO: support lazy rescheduling

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Date: Wed, 21 Feb 2024 18:15:34 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Raghavendra K T <raghavendra.kt@....com>, Ankur Arora
 <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org
Cc: peterz@...radead.org, torvalds@...ux-foundation.org, paulmck@...nel.org,
 akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
 dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
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 konrad.wilk@...cle.com
Subject: Re: [PATCH 00/30] PREEMPT_AUTO: support lazy rescheduling

On Wed, Feb 21 2024 at 17:53, Raghavendra K T wrote:
> Configuration tested.
> a) Base kernel (6.7),

Which scheduling model is the baseline using?

> b) patched with PREEMPT_AUTO voluntary preemption.
> c) patched with PREEMPT_DYNAMIC voluntary preemption.
>
> Workloads I tested and their %gain,
>                     case b                   case c
> NAS                +2.7                    +1.9
> Hashjoin,          +0			     +0
> XSBench	     +1.7		     +0
> Graph500,  	     -6 		     +0

The Graph500 stands out. Needs some analysis.

Thanks,

        tglx