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[66.183.142.209]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ab2986edecsm6410425ad.22.2026.02.10.20.17.46 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Feb 2026 20:17:47 -0800 (PST) From: "Doug Smythies" To: "'Sergey Senozhatsky'" , "'Rafael J. Wysocki'" Cc: "'Xueqin Luo'" , , , , , , , , "Doug Smythies" References: <006601dc965c$afe30280$0fa90780$@telus.net> <20260210093321.71876-1-luoxueqin@kylinos.cn> <67clm4sqv5cbqxjhjoyn4eodwocc2jm6piwky6cyv4zncfrp7p@izdkjc5db37j> In-Reply-To: Subject: RE: Performance regressions introduced via Revert "cpuidle: menu: Avoid discarding useful information" on 5.15 LTS Date: Tue, 10 Feb 2026 20:17:50 -0800 Message-ID: <001b01dc9b0d$62e27280$28a75780$@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="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Content-Language: en-ca Thread-Index: AQHR7wO/JX5ylMBngEY9dRbzh1sTOQJs4mJRAbvJU1kA/AGrfADxq7xetWGIViA= On 2026.02.10 17:34 Sergey Senozhatsky wrote: > On (26/02/10 15:24), Rafael J. Wysocki wrote: >> On Tue, Feb 10, 2026 at 11:04=E2=80=AFAM Sergey Senozhatsky wrote: >>> On (26/02/10 17:33), Xueqin Luo wrote: >>>> >>>> In addition to the cpuidle statistics, measured system idle power = is >>>> about 2W higher when this commit is applied. >>>> >>> >>> We also noticed shorted battery life on some of the affected = laptops. >>=20 >> Was the difference significant? > > I think I saw up to "5.16% regression in perf.minutes_battery_life" Note: I get a fair bit of noise on my idle tests of recent. For what it's worth: On my test computer I got: kernel 6.19-rc8 and with reapply. Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs. CPU frequency scaling driver: intel_pstate. CPU frequency scaling governor: powersave. HWP: enabled. idle governor menu. Git Branch "doug" 3856f38e5bb9 (HEAD -> doug) Reapply "cpuidle: menu: Avoid discarding = useful information" 18f7fcd5e69a (tag: v6.19-rc8) Linux 6.19-rc8 Processor Package Power: average reapply: 140 minutes: 1.783028571 average rc8: 512 minutes: 1.656212891 7.65% more power