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Thu, 9 Jul 2020 12:56:44 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200709035644epsmtip295da1225b8f6210d69568765d9b1c019~f_WTC22E-1353413534epsmtip2j; Thu, 9 Jul 2020 03:56:44 +0000 (GMT) Subject: Re: [PATCH 1/2] memory: samsung: exynos5422-dmc: Adjust polling interval and uptreshold To: Lukasz Luba , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Cc: willy.mh.wolff.ml@gmail.com, k.konieczny@samsung.com, b.zolnierkie@samsung.com, krzk@kernel.org, chanwoo@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, s.nawrocki@samsung.com, kgene@kernel.org From: Chanwoo Choi Organization: Samsung Electronics Message-ID: Date: Thu, 9 Jul 2020 13:08:09 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Thunderbird/59.0 MIME-Version: 1.0 In-Reply-To: <20200708153420.29484-2-lukasz.luba@arm.com> Content-Language: en-US Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrIJsWRmVeSWpSXmKPExsWy7bCmnm7tVLZ4g4Mr2Sw2zljPajHxxhUW iwWfZrBa9D9+zWxx/vwGdouzTW/YLTY9vsZqcXnXHDaLz71HGC1mnN/HZLGwqYXd4nbjCjaL w2/aWS2+nXjE6MDnsWbeGkaPnbPusntsWtXJ5rF5Sb1H35ZVjB6fN8kFsEVl22SkJqakFimk 5iXnp2TmpdsqeQfHO8ebmhkY6hpaWpgrKeQl5qbaKrn4BOi6ZeYAXaukUJaYUwoUCkgsLlbS t7Mpyi8tSVXIyC8usVVKLUjJKbAs0CtOzC0uzUvXS87PtTI0MDAyBSpMyM5offGFuaCPq2JP 90KmBsZVHF2MnBwSAiYS587PY+5i5OIQEtjBKLHj5lEmCOcTo8Tl2ydYIJxvjBJf/zYClXGA tcx/JQ4R38so0bnjFCOE855RYtWl96wgc4UFkiSWvZ4MNkpEYBWjxPf3R1hBHGaBO0CjGucy glSxCWhJ7H9xgw3E5hdQlLj64zFYnFfATmL+931gNouAisSM7fvZQWxRgTCJk9taoGoEJU7O fMICYnMKWEr8nD4TbA6zgLjErSfzmSBseYntb+eAfSchcIFD4uOdi2wQb7tITHr5lBHCFpZ4 dXwLO4QtJfGyvw3KrpZYefIIG0RzB6PElv0XWCESxhL7l4L8xgG0QVNi/S59iLCixM7fEI8x C/BJvPvawwoJL16JjjYhiBJlicsP7jJB2JISi9s72SYwKs1C8s4sJC/MQvLCLIRlCxhZVjGK pRYU56anFhsWGCLH9yZGcFrWMt3BOPHtB71DjEwcjIcYJTiYlUR4DRRZ44V4UxIrq1KL8uOL SnNSiw8xmgIDeCKzlGhyPjAz5JXEG5oaGRsbW5gYmpkaGiqJ8+aoAzUJpCeWpGanphakFsH0 MXFwSjUwiW/lly91uyA5W95he37kxchlWRb+ApdsDstudOC9YWzfLGv8oXHalzzRpkijq45X PgrFzrFfzpaf/c52xsGTNXfvLr/cb1i0Kn5fhnn4VUnpnYYN237/1jx6Lc/IUfjuh8Bl0keP qQR65azsmZ2z5eyRmg91j5VEzzeLWRTMKVNvDWwNC/C8k9b48Yeg79fa7rONzIGVM5/OvL3A 8ic7L3ta4Kp/NcH2DFc2rZ127GvqygQt2yvc4spJtT7r79UWZfvs5dh3frqcoejn2vUvVZz2 hHgduKdfs+7/pObt+xuO35qs+7bNQDLp1I3JDhNDhP7kn96v5isXsEL3i5bKB8XcLgbnlMmx x44rnfqgxFKckWioxVxUnAgAK7LIe1QEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrFIsWRmVeSWpSXmKPExsWy7bCSvG7NVLZ4g6P/pC02zljPajHxxhUW iwWfZrBa9D9+zWxx/vwGdouzTW/YLTY9vsZqcXnXHDaLz71HGC1mnN/HZLGwqYXd4nbjCjaL w2/aWS2+nXjE6MDnsWbeGkaPnbPusntsWtXJ5rF5Sb1H35ZVjB6fN8kFsEVx2aSk5mSWpRbp 2yVwZbS++MJc0MdVsad7IVMD4yqOLkYODgkBE4n5r8S7GLk4hAR2M0rsm3+JvYuREyguKTHt 4lFmiBphicOHiyFq3jJKzHm8lRWkRlggSWLZ68lMIAkRgVWMEvfu3wBrZha4wyhxsCUSburq a6sZQRJsAloS+1/cYAOx+QUUJa7+eAwW5xWwk5j/fR+YzSKgIjFj+36wQaICYRI7lzxmgqgR lDg58wkLiM0pYCnxc/pMNohl6hJ/5l1ihrDFJW49mc8EYctLbH87h3kCo/AsJO2zkLTMQtIy C0nLAkaWVYySqQXFuem5xYYFhnmp5XrFibnFpXnpesn5uZsYwdGppbmDcfuqD3qHGJk4GA8x SnAwK4nwGiiyxgvxpiRWVqUW5ccXleakFh9ilOZgURLnvVG4ME5IID2xJDU7NbUgtQgmy8TB KdXA1PbI7fHknPbGp45HlvCvVf6m3y57/q/ZKf8Z+Xsf2iYePV09/dCGaJ+AY2K2zy7uvnTO 7Cd7RXXsWf2ZdysOVolfmlXI+XjpFM/c3N1PfNmmRG+yCIzLn509tXJ234UuvflX5pcynC+N C/83XfDhvAmic7bVLm47VXBSwz/9eaXYi4MSIpee1rJo/faXPteQsPH1/UMGYbvvvC8+vu2+ xefKovD3B3i6GhoEyrmdC+0LfsXYXPKL1NLTWrR1rc0PfdVzNWLR/4M1bZOOhlwLu+8363iL SdqTr5zTPAoqezduP1lZ67qjV3GzWy+jOXvTswlnp8VZWEsl1m2ecqd5gcDyUuXqZ5xGS6f5 uPalK7EUZyQaajEXFScCAPZMCWM9AwAA X-CMS-MailID: 20200709035644epcas1p33f1cb4e5797fcdca3f038c76b08b910f X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200708153448epcas1p438fae2327ac69fcc1a78d9c73cfda501 References: <20200708153420.29484-1-lukasz.luba@arm.com> <20200708153420.29484-2-lukasz.luba@arm.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org 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 > Signed-off-by: Lukasz Luba > --- > 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 -- Best Regards, Chanwoo Choi Samsung Electronics