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Date: Wed, 21 Feb 2024 22:57:54 +0530
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Subject: Re: [PATCH 00/30] PREEMPT_AUTO: support lazy rescheduling
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To: Thomas Gleixner <tglx@linutronix.de>,
 Ankur Arora <ankur.a.arora@oracle.com>, linux-kernel@vger.kernel.org
Cc: peterz@infradead.org, torvalds@linux-foundation.org, paulmck@kernel.org,
 akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de,
 dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com,
 juri.lelli@redhat.com, vincent.guittot@linaro.org, willy@infradead.org,
 mgorman@suse.de, jpoimboe@kernel.org, mark.rutland@arm.com, jgross@suse.com,
 andrew.cooper3@citrix.com, bristot@kernel.org,
 mathieu.desnoyers@efficios.com, geert@linux-m68k.org,
 glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com,
 mattst88@gmail.com, krypton@ulrich-teichert.org, rostedt@goodmis.org,
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 konrad.wilk@oracle.com
References: <20240213055554.1802415-1-ankur.a.arora@oracle.com>
 <15fcf98c-58c5-fa08-2e21-f3b0baf058e6@amd.com> <87zfvtg2mh.ffs@tglx>
From: Raghavendra K T <raghavendra.kt@amd.com>
In-Reply-To: <87zfvtg2mh.ffs@tglx>
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On 2/21/2024 10:45 PM, Thomas Gleixner wrote:
> 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?
> 

baseline is also PREEMPT_DYNAMIC with voluntary preemption

>> 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.
> 

Sure. Will do more detailed analysis and comeback on this.

Thanks
- Raghu