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15.20.8880.021; Fri, 27 Jun 2025 14:41:55 +0000 Message-ID: Date: Fri, 27 Jun 2025 08:41:49 -0600 User-Agent: Mozilla Thunderbird Subject: Re: question about behaviour of cpuidle on 6.6...seeing *many* missed estimates To: Christian Loehle , daniel.lezcano@linaro.org, kgene@kernel.org, krzysztof.kozlowski@linaro.org, linux-pm@vger.kernel.org References: <0dd1f3be-3bdf-44c9-a6d5-623077714149@windriver.com> <7d43a796-d831-430b-92d9-53b3d8351fb6@arm.com> Content-Language: en-US From: Chris Friesen In-Reply-To: <7d43a796-d831-430b-92d9-53b3d8351fb6@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BLAPR03CA0088.namprd03.prod.outlook.com (2603:10b6:208:329::33) To DS7PR11MB8806.namprd11.prod.outlook.com (2603:10b6:8:253::19) Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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definitions=main-2506270120 On 6/27/2025 1:49 AM, Christian Loehle wrote: > On 6/26/25 19:26, Chris Friesen wrote: >> Hi, >> >> I've got an Ice Lake server running 6.6 PREEMPT_RT, currently using the acpi_idle cpuidle driver and the "menu" governor. I'm seeing some weird behaviour with cpuidle and C-states and was hoping someone might be able to shed some light on what's happening. > > Does your kernel include > 3cd2aa93674e cpuidle: menu: Avoid discarding useful information > (since v6.6.93)? It does not. Thanks for the pointer, that commit looks potentially helpful. Chris