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[66.183.142.209]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3567e7d8eb9sm671636a91.1.2026.02.10.20.27.24 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Feb 2026 20:27:24 -0800 (PST) From: "Doug Smythies" To: "'Sergey Senozhatsky'" Cc: "'Rafael J. Wysocki'" , "'Christian Loehle'" , "'Harshvardhan Jha'" , "'Sasha Levin'" , "'Greg Kroah-Hartman'" , , , "'Daniel Lezcano'" , "Doug Smythies" References: <3b0720d2-9b72-48d0-998a-1fd091cec44f@arm.com> <5d4b624c-f993-49aa-95ab-5f279f7f6599@oracle.com> <8fd5a9d4-e555-4db1-aa02-8fe5b8a2962c@arm.com> <3395ad0b-425e-40f5-844c-627cff471353@oracle.com> <3f0cfac2-b753-413c-9a7e-0892c23cdbf4@arm.com> <005401dc9638$b3e2ea40$1ba8bec0$@telus.net> <006e01dc965e$d82c33e0$88849ba0$@telus.net> <4a3hybz6es2vwav3xlug437zhgsrvwy23ughzpslve57ifaeoj@5uue6jb24osk> In-Reply-To: <4a3hybz6es2vwav3xlug437zhgsrvwy23ughzpslve57ifaeoj@5uue6jb24osk> Subject: RE: Performance regressions introduced via Revert "cpuidle: menu: Avoid discarding useful information" on 5.15 LTS Date: Tue, 10 Feb 2026 20:27:27 -0800 Message-ID: <001e01dc9b0e$bad71ee0$30855ca0$@telus.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Content-Language: en-ca Thread-Index: AQIGJdMaf/4M855ptbp1U7uUSdSxOwCgaPhQAgSxF3QCdRKf4wD6zBBnAsuKJa4A5XOx7gIlm1O2AkVayRsB9fXYlgIfLOLLtJegAMA= On 2026.02.10 01:17 Sergey Senozhatsky wrote: > On (26/02/04 21:18), Doug Smythies wrote: >> >>> (I'll need some help with instructions/etc.) >> >> From your turbostat data from October you are using the intel_pstate >> CPU frequency scaling driver and the powersave CPU frequency scaling governor >> and HWP enabled. Also your maximum CPU frequency is 3,300 MHz. >> >> To limit the maximum CPU frequency to around 2,200 MHz do: >> >> echo 67 |sudo tee /sys/devices/system/cpu/intel_pstate/max_perf_pct > > So I only set max_perf_pct > > echo 67 |sudo tee /sys/devices/system/cpu/intel_pstate/max_perf_pct > > and re-ran the test: > > revert: 72.5 > base: 82.5 > > // as before "revert" means revert of "cpuidle: menu: Avoid discarding useful > // information", while base means that the patch is applied. > > Please find turbostat logs attached. Than you for doing the test. So now the turbostat data shows that the processor never gets anywhere near any throttling threshold, eliminating it form consideration. ... Doug