linux-kernel - Re: [PATCH 1/2] memory: samsung: exynos5422-dmc: Adjust polling interval and uptreshold

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Message-ID: <fa3f651a-3c2b-188b-e2dc-4fd05ce4a1b7@samsung.com>
Date:   Thu, 9 Jul 2020 13:08:09 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Cc:     willy.mh.wolff.ml@...il.com, k.konieczny@...sung.com,
        b.zolnierkie@...sung.com, krzk@...nel.org, chanwoo@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        s.nawrocki@...sung.com, kgene@...nel.org
Subject: Re: [PATCH 1/2] memory: samsung: exynos5422-dmc: Adjust polling
 interval and uptreshold

Hi Lukasz,

On 7/9/20 12:34 AM, Lukasz Luba wrote:
> In order to react faster and make better decisions under some workloads,
> benchmarking the memory subsystem behavior, adjust the polling interval
> and upthreshold value used by the simple_ondemand governor.
> 
> Reported-by: Willy Wolff <willy.mh.wolff.ml@...il.com>
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
>  drivers/memory/samsung/exynos5422-dmc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
> index 93e9c2429c0d..e03ee35f0ab5 100644
> --- a/drivers/memory/samsung/exynos5422-dmc.c
> +++ b/drivers/memory/samsung/exynos5422-dmc.c
> @@ -1466,10 +1466,10 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
>  		 * Setup default thresholds for the devfreq governor.
>  		 * The values are chosen based on experiments.
>  		 */
> -		dmc->gov_data.upthreshold = 30;
> +		dmc->gov_data.upthreshold = 10;
>  		dmc->gov_data.downdifferential = 5;
>  
> -		exynos5_dmc_df_profile.polling_ms = 500;
> +		exynos5_dmc_df_profile.polling_ms = 100;
>  	}
>  
>  
> 

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics