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b=GIZeW8ci6XDlh3wat6fzst5r2yVii1pZFjyACx6FS0pfUrG1Ne+wGYw9jbWXBi2y6byqtj3d1i3mAS6JGfDTkv7PdL52mVnnze4/oaSamb3Da+onRYqAPELRdRmT+i1+BLpr0BgJYx1u/Hl3Fe5TS5P4znG9VuKmVUnP8y99RmM= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from MN0PR12MB6101.namprd12.prod.outlook.com (2603:10b6:208:3cb::10) by DS5PPF6BCF148B6.namprd12.prod.outlook.com (2603:10b6:f:fc00::652) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8989.13; Fri, 1 Aug 2025 12:32:30 +0000 Received: from MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::37ee:a763:6d04:81ca]) by MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::37ee:a763:6d04:81ca%7]) with mapi id 15.20.8989.017; Fri, 1 Aug 2025 12:32:30 +0000 Message-ID: Date: Fri, 1 Aug 2025 18:02:18 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [EXTERNAL] Re: linux-6.6.y regression on amd-pstate To: "Jones, Morgan" Cc: Sasha Levin , "linux-pm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , David Arcari , Dhananjay Ugwekar , "rafael@kernel.org" , "viresh.kumar@linaro.org" , "gautham.shenoy@amd.com" , "perry.yuan@amd.com" , "skhan@linuxfoundation.org" , "li.meng@amd.com" , "ray.huang@amd.com" , "stable@vger.kernel.org" , Linux kernel regressions list , Christian Heusel , Greg Kroah-Hartman References: <66f08ce529d246bd8315c87fe0f880e6@viasat.com> <645f2e77-336b-4a9c-b33e-06043010028b@amd.com> <2e36ee28-d3b8-4cdb-9d64-3d26ef0a9180@amd.com> <7f50abf9-e11a-4630-9970-f894c9caee52@amd.com> <2024090834-hull-unbalance-ca6b@gregkh> <2ffb55e3-6752-466a-b06b-98c324a8d3cc@heusel.eu> <2024090825-clarity-cofounder-5c79@gregkh> <534cb3af86bd4371800ebfb3035382c2@viasat.com> Content-Language: en-US From: Mario Limonciello In-Reply-To: <534cb3af86bd4371800ebfb3035382c2@viasat.com> Content-Type: text/plain; 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The symptom appears to be that the core will not boost past 2 GHz (the nominal frequency), so we lose out on 1.36 GHz of boost frequency. Downgrade from 6.15.7 to LTS (6.12.39) seems to fix it. > > Keeping an eye out for other threads reporting similar symptoms on recent kernels: > > [ 0.000000] Linux version 6.15.7-xanmod1 (nixbld@localhost) (gcc (GCC) 14.2.1 20250322, GNU ld (GNU Binutils) 2.44) #1-NixOS SMP PREEMPT_DYNAMIC Tue Jan 1 00:00:00 UTC 1980 > > # cat /proc/cmdline > [snip] amd_pstate=active amd_prefcore=enable amd_pstate.shared_mem=1 > > # cat /proc/cpuinfo > [snip] > processor : 127 > vendor_id : AuthenticAMD > cpu family : 23 > model : 49 > model name : AMD EPYC 7702 64-Core Processor > stepping : 0 > microcode : 0x830107d > cpu MHz : 400.000 > cache size : 512 KB > physical id : 0 > siblings : 128 > core id : 63 > cpu cores : 64 > apicid : 127 > initial apicid : 127 > fpu : yes > fpu_exception : yes > cpuid level : 16 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd amd_ppin arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip rdpid overflow_recov succor smca sev sev_es > bugs : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass retbleed smt_rsb srso ibpb_no_ret > bogomips : 3992.75 > TLB size : 3072 4K pages > clflush size : 64 > cache_alignment : 64 > address sizes : 43 bits physical, 48 bits virtual > power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14] > > # cpupower frequency-info > analyzing CPU 76: > driver: amd-pstate-epp > CPUs which run at the same hardware frequency: 76 > CPUs which need to have their frequency coordinated by software: 76 > energy performance preference: performance > hardware limits: 408 MHz - 3.36 GHz > available cpufreq governors: performance powersave > current policy: frequency should be within 1.51 GHz and 3.36 GHz. > The governor "performance" may decide which speed to use > within this range. > current CPU frequency: 1.98 GHz (asserted by call to kernel) > boost state support: > Supported: yes > Active: yes > amd-pstate limits: > Highest Performance: 255. Maximum Frequency: 3.36 GHz. > Nominal Performance: 152. Nominal Frequency: 2.00 GHz. > Lowest Non-linear Performance: 115. Lowest Non-linear Frequency: 1.51 GHz. > Lowest Performance: 31. Lowest Frequency: 400 MHz. > Preferred Core Support: 0. Preferred Core Ranking: 255. > > Regards, > Morgan > Hello Morgan, 6.12 to 6.15 unfortunately includes a pretty big overhaul to the amd-pstate driver. But I'm pretty surprised to hear this regression as we have had a lot of mileage on it across a very wide variety of hardware. That being said: 1) Please capture a report using amd-pstate from amd-debug-tools (https://git.kernel.org/pub/scm/linux/kernel/git/superm1/amd-debug-tools.git/about/) both on a good and bad kernel and share them. 2) Can you reproduce on mainline 6.16? If 1 and 2 don't lead an obvious answer: 3) Can you please bisect? Thanks,