There is a change from 6.8 kernel to 6.9-rc which causes AMD Ryzen 7840HS CPU not to be able to boost single core CPU. Geekbench single core score is approx 15% lower (2265 vs 2538). The problem does not show with kernel 6.8 or 6.7. It is irrelevant whether kernel command line has amd-pstate-epp driver loaded as active or passive or guide. Simple loading of single core with: cat /dev/zero > /dev/null Shows both in 'htop' as well as with 'turbostat' that in the case of kernel 4.9-rc5 (as well as previous rcX) that CPU boosts single core only to 4.35GHz where with previous kernels it goes as high as 5.1GHz. Here are the outputs of lscpu, and turbopower while running 'cat /dev/zero > /dev/null' 1st with 6.8 kernel (working ok) and than with 6.9-rc5 kernel which has a problem Hint if it helps - lscpu already shows maximum frequency as 4350Mhz with 6.9-rc kernels ----- zh@muc:~$ uname -a Linux muc 6.8.7-060807-generic #202404170934 SMP PREEMPT_DYNAMIC Wed Apr 17 09:46:48 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux zh@muc:~$ sudo lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 48 bits physical, 48 bits virtual Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-15 Vendor ID: AuthenticAMD BIOS Vendor ID: Advanced Micro Devices, Inc. Model name: AMD Ryzen 7 7840HS w/ Radeon 780M Graphics BIOS Model name: AMD Ryzen 7 7840HS w/ Radeon 780M Graphics Unknown CPU @ 3.8GHz BIOS CPU family: 107 CPU family: 25 Model: 116 Thread(s) per core: 2 Core(s) per socket: 8 Socket(s): 1 Stepping: 1 Frequency boost: enabled CPU(s) scaling MHz: 32% CPU max MHz: 6080.0000 CPU min MHz: 400.0000 BogoMIPS: 7586.12 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 pdp e1gb rdtscp lm constant_tsc rep_good amd_lbr_v2 nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3d nowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba p erfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx sma p avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total c qm_mbm_local user_shstk avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_cl ean flushbyasid decodeassists pausefilter pfthreshold v_vmsave_vmload vgif x2avic v_spec_ctrl vnmi avx512vbmi umip pku ospke avx512 _vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid overflow_recov succor smca flush_l1d Virtualization features: Virtualization: AMD-V Caches (sum of all): L1d: 256 KiB (8 instances) L1i: 256 KiB (8 instances) L2: 8 MiB (8 instances) L3: 16 MiB (1 instance) NUMA: NUMA node(s): 1 NUMA node0 CPU(s): 0-15 Vulnerabilities: Gather data sampling: Not affected Itlb multihit: Not affected L1tf: Not affected Mds: Not affected Meltdown: Not affected Mmio stale data: Not affected Reg file data sampling: Not affected Retbleed: Not affected Spec rstack overflow: Vulnerable: Safe RET, no microcode Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Spectre v2: Mitigation; Enhanced / Automatic IBRS; IBPB conditional; STIBP always-on; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected Srbds: Not affected Tsx async abort: Not affected zh@muc:~/git/kernel/tools/power/x86/turbostat$ sudo ./turbostat turbostat version 2024.04.08 - Len Brown <lenb@kernel.org> Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.8.7-060807-generic root=UUID=dc0bb664-2e43-421d-bd28-96d0332f030c ro amd_pstate=guided iommu=pt quiet CPUID(0): AuthenticAMD 0x10 CPUID levels CPUID(1): family:model:stepping 0x19:74:1 (25:116:1) microcode 0x0 CPUID(0x80000000): max_extended_levels: 0x80000028 CPUID(1): SSE3 MONITOR - - - TSC MSR - HT - CPUID(6): APERF, No-TURBO, No-DTS, No-PTM, No-HWP, No-HWPnotify, No-HWPwindow, No-HWPepp, No-HWPpkg, No-EPB CPUID(7): No-SGX No-Hybrid cpu0: cpufreq driver: amd-pstate cpu0: cpufreq governor: ondemand cpufreq boost: 1 /dev/cpu_dma_latency: 2000000000 usec (default) current_driver: acpi_idle current_governor: menu current_governor_ro: menu cpu0: POLL: CPUIDLE CORE POLL IDLE cpu0: C1: ACPI FFH MWAIT 0x0 cpu0: C2: ACPI IOPORT 0x414 cpu0: C3: ACPI IOPORT 0x415 RAPL: 234 sec. Joule Counter Range, at 280 Watts cpu0: MSR_RAPL_PWR_UNIT: 0x000a1003 (0.125000 Watts, 0.000015 Joules, 0.000977 sec.) Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz IPC IRQ POLL C1 C2 C3 POLL% C1% C2% C3% CorWatt PkgWatt - - 481 10.30 4667 3798 1.83 51969 427 4016 12902 10122 0.01 0.31 5.88 83.78 19.52 28.87 0 0 986 22.42 4401 3793 1.37 11392 162 1214 2794 3079 0.09 1.87 14.58 61.81 3.64 28.82 0 8 44 1.33 3351 3793 0.44 1514 0 27 268 721 0.00 0.03 1.87 96.94 1 1 29 1.31 2190 3793 0.51 1802 0 2 204 1059 0.00 0.00 2.72 96.23 0.23 1 9 16 0.62 2531 3793 0.58 478 0 26 107 157 0.00 0.02 0.78 98.62 2 2 1174 26.61 4413 3793 1.37 16684 235 2542 8383 302 0.12 2.76 65.77 5.07 4.96 2 10 225 4.93 4571 3793 1.06 2451 0 47 394 1020 0.00 0.06 2.21 93.01 3 3 15 0.67 2264 3793 0.45 845 0 13 100 402 0.00 0.04 0.80 98.59 0.18 3 11 15 0.67 2302 3793 0.57 542 0 3 60 277 0.00 0.00 0.83 98.56 4 4 14 0.55 2464 3793 0.47 861 2 13 328 286 0.00 0.01 1.74 97.76 0.24 4 12 39 1.43 2736 3793 0.69 871 0 3 65 433 0.00 0.00 0.66 98.01 5 5 2203 44.20 4984 3793 2.12 4691 25 1 24 367 0.02 0.00 0.20 55.63 9.82 5 13 2825 56.38 5011 3793 2.13 7846 3 99 27 1064 0.00 0.05 0.40 43.21 6 6 17 0.60 2796 3793 0.70 517 0 1 31 264 0.00 0.00 0.30 99.16 0.15 6 14 10 0.44 2263 3793 0.44 440 0 0 38 223 0.00 0.00 0.45 99.16 7 7 59 2.42 2453 3793 1.11 862 0 25 78 383 0.00 0.07 0.55 97.05 0.26 7 15 3 0.12 2161 3793 0.62 173 0 0 1 85 0.00 0.00 0.01 99.88 --------------------- zh@muc:~$ uname -a Linux muc 6.9.0-rc5-zh-250HZ #3 SMP PREEMPT_DYNAMIC Sun Apr 21 22:11:26 CEST 2024 x86_64 x86_64 x86_64 GNU/Linux zh@muc:~$ sudo lscpu [sudo] password for zh: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 48 bits physical, 48 bits virtual Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-15 Vendor ID: AuthenticAMD BIOS Vendor ID: Advanced Micro Devices, Inc. Model name: AMD Ryzen 7 7840HS w/ Radeon 780M Graphics BIOS Model name: AMD Ryzen 7 7840HS w/ Radeon 780M Graphics Unknown CPU @ 3.8GHz BIOS CPU family: 107 CPU family: 25 Model: 116 Thread(s) per core: 2 Core(s) per socket: 8 Socket(s): 1 Stepping: 1 Frequency boost: enabled CPU(s) scaling MHz: 22% CPU max MHz: 4350.0000 CPU min MHz: 400.0000 BogoMIPS: 7586.23 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 pdp e1gb rdtscp lm constant_tsc rep_good amd_lbr_v2 nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misa lignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba perfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdse ed adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_m bm_total cqm_mbm_local user_shstk avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd cppc arat npt lbrv svm_lock nrip_save tsc_sca le vmcb_clean flushbyasid decodeassists pausefilter pfthreshold v_vmsave_vmload vgif x2avic v_spec_ctrl vnmi avx512vbmi umip pku os pke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid overflow_recov succor smca flush_l1d amd_lbr _pmc_freeze Virtualization features: Virtualization: AMD-V Caches (sum of all): L1d: 256 KiB (8 instances) L1i: 256 KiB (8 instances) L2: 8 MiB (8 instances) L3: 16 MiB (1 instance) NUMA: NUMA node(s): 1 NUMA node0 CPU(s): 0-15 Vulnerabilities: Gather data sampling: Not affected Itlb multihit: Not affected L1tf: Not affected Mds: Not affected Meltdown: Not affected Mmio stale data: Not affected Reg file data sampling: Not affected Retbleed: Not affected Spec rstack overflow: Vulnerable: No microcode Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Spectre v2: Mitigation; Enhanced / Automatic IBRS; IBPB conditional; STIBP always-on; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected Srbds: Not affected Tsx async abort: Not affected zh@muc:~/git/kernel/tools/power/x86/turbostat$ sudo ./turbostat turbostat version 2024.04.08 - Len Brown <lenb@kernel.org> Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.9.0-rc5-zh-250HZ root=UUID=dc0bb664-2e43-421d-bd28-96d0332f030c ro amd_pstate=guided iommu=pt quiet CPUID(0): AuthenticAMD 0x10 CPUID levels CPUID(1): family:model:stepping 0x19:74:1 (25:116:1) microcode 0x0 CPUID(0x80000000): max_extended_levels: 0x80000028 CPUID(1): SSE3 MONITOR - - - TSC MSR - HT - CPUID(6): APERF, No-TURBO, No-DTS, No-PTM, No-HWP, No-HWPnotify, No-HWPwindow, No-HWPepp, No-HWPpkg, No-EPB CPUID(7): No-SGX No-Hybrid cpu0: cpufreq driver: amd-pstate cpu0: cpufreq governor: ondemand cpufreq boost: 1 /dev/cpu_dma_latency: 2000000000 usec (default) current_driver: acpi_idle current_governor: menu current_governor_ro: menu cpu0: POLL: CPUIDLE CORE POLL IDLE cpu0: C1: ACPI FFH MWAIT 0x0 cpu0: C2: ACPI IOPORT 0x414 cpu0: C3: ACPI IOPORT 0x415 RAPL: 234 sec. Joule Counter Range, at 280 Watts cpu0: MSR_RAPL_PWR_UNIT: 0x000a1003 (0.125000 Watts, 0.000015 Joules, 0.000977 sec.) Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz IPC IRQ POLL C1 C2 C3 POLL% C1% C2% C3% CorWatt PkgWatt - - 292 7.30 4005 3802 2.43 23723 44 656 6574 9594 0.00 0.18 4.10 88.76 4.39 11.77 0 0 52 2.57 2029 3793 0.65 3004 27 175 364 1643 0.00 0.51 3.27 94.01 0.11 11.73 0 8 15 0.75 1991 3793 0.60 946 1 11 212 398 0.00 0.13 1.33 97.89 1 1 37 1.79 2084 3793 1.17 1309 1 26 194 712 0.00 0.25 1.71 96.40 0.60 1 9 645 15.13 4260 3793 2.54 528 0 0 7 140 0.00 0.00 0.04 84.85 2 2 91 3.86 2361 3793 1.02 8182 14 122 4979 2346 0.00 0.18 51.79 44.75 0.37 2 10 13 0.53 2410 3793 0.71 1132 0 21 98 688 0.00 0.14 0.85 98.58 3 3 2243 52.14 4302 3793 2.55 1798 0 30 165 266 0.00 0.56 1.14 46.21 3.02 3 11 1432 33.34 4294 3793 2.56 853 0 8 24 85 0.00 0.10 0.22 66.35 4 4 21 0.98 2191 3793 0.82 820 0 4 66 478 0.00 0.04 0.47 98.61 0.07 4 12 14 0.78 1861 3793 0.88 568 0 8 52 320 0.00 0.00 0.49 98.80 5 5 9 0.47 1932 3793 0.87 416 0 6 34 235 0.00 0.03 0.36 99.17 0.04 5 13 7 0.30 2314 3793 0.67 221 0 10 19 125 0.00 0.03 0.16 99.23 6 6 33 1.62 2024 3793 1.02 1539 0 169 175 796 0.00 0.27 1.92 96.35 0.11 6 14 27 1.40 1896 3793 0.62 1318 1 26 95 764 0.00 0.15 0.81 97.76 7 7 14 0.61 2250 3793 0.72 653 0 25 55 357 0.00 0.35 0.53 98.58 0.05 7 15 10 0.45 2146 3793 0.71 436 0 15 35 241 0.00 0.15 0.23 99.21
Created attachment 306193 [details] cppc check script
Hi There, Could you run the script to capture the CPPC capabilities to check the detail? Perry
Created attachment 306194 [details] Output of CPCC script (on 6.8.0-rc5 kernel) Output of cppc_attr_values_check.sh script. BTW, it is exactly the same when ran on 'older' 6.8.7 kernel
Anything else i could do that might help pinpoint or reproduce the issue ?
(In reply to Gaha from comment #4) > Anything else i could do that might help pinpoint or reproduce the issue ? Hi Gaha, Sorry to reply late, could you please try the below two patchset ? 1. https://lore.kernel.org/lkml/cover.1713858800.git.perry.yuan@amd.com/ 2. https://lore.kernel.org/lkml/cover.1713861200.git.perry.yuan@amd.com/ then switch to amd pstate EPP driver mode, then provide "lscpu -ae" output with "tbench -t 100 2" then we could see what it changed. Perry.
hi, I've applied patches to 6.9.0-rc5 and built kernel with those. With kernel command line being either "passive", "guided" or "active" result is the same - single core never goes above 4.35Ghz. with 6.8 kernel it does go all the way to 5.1Ghz. here is the output of lscpu -ae when running Geekbench (during single core load) and it is the same with 'cat /dev/zero > /dev/null' . As for the 'tbench -t 100 2' - on my ubuntu system tbench is part of diskbench. If you were referring to tbench as part of kernel testing suite (https://docs.kernel.org/6.8/admin-guide/pm/amd-pstate.html) - i tried building it, it produces errors as scripts are looking for amd-pstate driver not amd-pstate-epp driver etc... However, am 100% certain that frequencies never boost above 4.35Ghz.(went back to 6.8.7 kernel and all is good). Here is the (hopefully useful output) showing that new 'cpp_boost' flag is there etc as well as lspci -ae outputs during single core loading: zh@muc:~/kselftest/amd-pstate$ cat /sys/devices/system/cpu/amd_pstate/cpb_boost 1 zh@muc:~/kselftest/amd-pstate$ cat /sys/devices/system/cpu/cpufreq/policy0/scaling_driver amd-pstate-epp zh@muc:~$ lscpu -ae CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ 0 0 0 0 0:0:0:0 yes 4350.0000 400.0000 400.0000 1 0 0 1 1:1:1:0 yes 4350.0000 400.0000 4309.2700 2 0 0 2 2:2:2:0 yes 4350.0000 400.0000 2416.1770 3 0 0 3 3:3:3:0 yes 4350.0000 400.0000 400.0000 4 0 0 4 4:4:4:0 yes 4350.0000 400.0000 1722.2209 5 0 0 5 5:5:5:0 yes 4350.0000 400.0000 400.0000 6 0 0 6 6:6:6:0 yes 4350.0000 400.0000 400.0000 7 0 0 7 7:7:7:0 yes 4350.0000 400.0000 400.0000 8 0 0 0 0:0:0:0 yes 4350.0000 400.0000 1480.4850 9 0 0 1 1:1:1:0 yes 4350.0000 400.0000 4307.9858 10 0 0 2 2:2:2:0 yes 4350.0000 400.0000 1751.6750 11 0 0 3 3:3:3:0 yes 4350.0000 400.0000 1722.3180 12 0 0 4 4:4:4:0 yes 4350.0000 400.0000 400.0000 13 0 0 5 5:5:5:0 yes 4350.0000 400.0000 400.0000 14 0 0 6 6:6:6:0 yes 4350.0000 400.0000 400.0000 15 0 0 7 7:7:7:0 yes 4350.0000 400.0000 400.0000 Are there any other tests i could run to help figure out root cause of problem with 6.9 kernel ?
FYI - sorry if obvious to you & the team - i tried manually compiling 6.8.7 and it works fine. I tried to see if these patches can be applied to it, but that is not the case. Therefore am certain that whatever is causing scaling in single core workloads not to work it is result of the changes made between 6.8 and 6.9 Appreciate this may not help but here it is. thank you
Can you please try with preferred core disabled? amd_prefcore=disable
hi , thank you for the suggestions (@Mario), I've just tried that as well. Single core workloads still do not go above 'basic' speeds. In addition to adding 'amd_prefcore=disable' below i've also tried adding explicitly to kernel command line amd_pstate various parameters (active, guided, passive) 'GRUB_CMDLINE_LINUX_DEFAULT="amd_pstate=guided amd_prefcore=disable iommu=pt quiet " with no change in behaviour zh@muc:~$ cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-6.9.0-rc5-zh-250HZ-amdpatches+ root=UUID=dc0bb664-2e43-421d-bd28-96d0332f030c ro amd_prefcore=disable iommu=pt quiet zh@muc:~$ uname -a Linux muc 6.9.0-rc5-zh-250HZ-amdpatches+ #5 SMP PREEMPT_DYNAMIC Thu Apr 25 11:45:21 CEST 2024 x86_64 x86_64 x86_64 GNU/Linux ... (In 2nd session am running 'cat /dev/zero >/dev/null') zh@muc:~$ lscpu -ae CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ 0 0 0 0 0:0:0:0 yes 4350.0000 400.0000 1815.3290 1 0 0 1 1:1:1:0 yes 4350.0000 400.0000 1724.5240 2 0 0 2 2:2:2:0 yes 4350.0000 400.0000 2156.9199 3 0 0 3 3:3:3:0 yes 4350.0000 400.0000 400.0000 4 0 0 4 4:4:4:0 yes 4350.0000 400.0000 400.0000 5 0 0 5 5:5:5:0 yes 4350.0000 400.0000 2050.2410 6 0 0 6 6:6:6:0 yes 4350.0000 400.0000 400.0000 7 0 0 7 7:7:7:0 yes 4350.0000 400.0000 400.0000 8 0 0 0 0:0:0:0 yes 4350.0000 400.0000 400.0000 9 0 0 1 1:1:1:0 yes 4350.0000 400.0000 400.0000 10 0 0 2 2:2:2:0 yes 4350.0000 400.0000 400.0000 11 0 0 3 3:3:3:0 yes 4350.0000 400.0000 400.0000 12 0 0 4 4:4:4:0 yes 4350.0000 400.0000 400.0000 13 0 0 5 5:5:5:0 yes 4350.0000 400.0000 400.0000 14 0 0 6 6:6:6:0 yes 4350.0000 400.0000 4315.7319 15 0 0 7 7:7:7:0 yes 4350.0000 400.0000 400.0000 I hope this helps ?
In that case, would you be able to bisect perhaps? I think you can *probably* focus the bisect on drivers/cpufreq directory so it should be relatively quick. Even if that is indeterminate you'll at least have a bunch of function hashes you can use to reduce the number of steps for a full kernel tree bisect.
(In reply to Mario Limonciello (AMD) from comment #10) > In that case, would you be able to bisect perhaps? I think you can > *probably* focus the bisect on drivers/cpufreq directory so it should be > relatively quick. > > Even if that is indeterminate you'll at least have a bunch of function > hashes you can use to reduce the number of steps for a full kernel tree > bisect. Hi, tx but am not sure I'd know how to do that. Just wanted to report a bug and help to the best of my abilities to get it sorted out as it may impact more people down the road.
This should help you get started on a bisect: https://www.kernel.org/doc/html/latest/admin-guide/bug-bisect.html If you can build a kernel you basically take a good and bash hash and then pick a point in between and keep going at half way points until you found the broken commit.
FWIW, a more verbose bisection guide can be found here: https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html While at it, let me add this to the regression tracking: #regzbot introduced: v6.8..v6.9-rc5 #regzbot summary: Ryzen 7840HS CPU single core never boosts to max frequency
Hi all, I have got issue root cause and working on new fix patch， there is one power firmware change on this generation CPU. will share the testing patch once I got it done. Perry.
:thumbs-up: :)
(In reply to Perry Yuan(AMD) from comment #14) > I have got issue root cause and working on new fix patch， What's the status? 6.9 might be released in 9 days and it would be good to have this fixed.
Perry is on leave right now for Labor Day so I'll update the status. The fix is developed but under internal code review at the moment. I don't expect it to make 6.9 but it's small enough we can aim for it to go to 6.9.y.
thx for the update, Mario!
Hi, Please try this patchset for the issue https://lore.kernel.org/lkml/cover.1715065568.git.perry.yuan@amd.com/
hi, i tried applying the batch to linux rcX tree and i can not get it to apply the patch. Have tried v6.9-rc7, -rc6 , -rc5 and -rc1 - all fail with the same msg: zh@muc:~/git/linus-kernel$ git am ./20240507_perry_yuan_amd_pstate_driver_fixes_and_improvements.mbx Applying: cpufreq: amd-pstate: optimiza the initial frequency values verification error: patch failed: drivers/cpufreq/amd-pstate.c:873 error: drivers/cpufreq/amd-pstate.c: patch does not apply Patch failed at 0001 cpufreq: amd-pstate: optimiza the initial frequency values verification hint: Use 'git am --show-current-patch=diff' to see the failed patch When you have resolved this problem, run "git am --continue". If you prefer to skip this patch, run "git am --skip" instead. To restore the original branch and stop patching, run "git am --abort". should I apply this to a different 'base' kernel code ? Will post file as a result of 'git am --show-current-patch=diff' as well if it helps:
Created attachment 306267 [details] result of 'git am --show-current-patch=diff'
(In reply to Perry Yuan(AMD) from comment #19) > https://lore.kernel.org/lkml/cover.1715065568.git.perry.yuan@amd.com/ Correct me if I'm wrong, but from Mario's earlier comment, the number of patches, and number of changed lines this does sounds like this won't be applied for 6.9 this late; there are no Fixes or stable tags either. So what's the plan to prevent this regression from entering 6.9? Do we know which commit caused this? Can we revert that one and reapply it for 6.10 (together with these changes, once reviewed).
Also: how many users do we suspect will run into this?
It's one patch in the series that was added to the series that helps, but a lot of this code is intertwined. I'll look whether it can move to front of the series if reordered.
Try to apply just patch 10 in that above link.
But that might need patch 9 too, we'll have to see what really makes sense for stable.
(In reply to Mario Limonciello (AMD) from comment #26) > But that might need patch 9 too, we'll have to see what really makes sense > for stable. Thank you Mario! I tried applying only 10 or 9&10 (git am -i ./patchfromperry.mbx) and it fails in the same way. Have even played with previous other pstate patches (latest versions of those mentioned at the top of this thread that Perry mentioned may help) - with no avail. So my question is please the same: *** to which source version these patches correspond to and what are the prerequiste patches (if any) ? ***
Everything should be based off the bleeding-edge branch for linux-pm which is code headed to 6.10.
(In reply to Mario Limonciello (AMD) from comment #28) > Everything should be based off the bleeding-edge branch for linux-pm which > is code headed to 6.10. Thank you Mario - not so simple for not-kernel-developers :( Appreciate the response and clarity though :) Was hoping to be able to test and report but will need to wait a month or so i guess for 6.10-rc1 to be able to do that. Pity 6.9 will limit single core performance on loads of AMD Ryzen CPUs ... unless Perry manages to address that issue w/o requiring all the other patches ... still not clear which change from 6.8 to 6.9 caused this to go 'wrong' Thank you all !
btw i did clone both linux-next as well as linux-pm and could not apply those patches to either of them :(
I've pulled out just the relevant fix to it's own patch here: https://lore.kernel.org/linux-pm/20240507174810.46709-1-mario.limonciello@amd.com/T/#u I applied that to 6.9-rc7 and tested it. Can you see if that helps you?
hi Mario - FANTASTIC job - Thank you :) ! Applied to -rc7 - recompiled - all good. When running single core tasks on my Ryzen 7840HS single core does go to almost 5.1GHz as it used to... Geekbench scores are great. I tried only with 'amd_pstate=active' as kernel parameter - should i test with 'guided' and/or 'passive' , or it is a waste of time as this fix addressed all scenarios ?
Great! It should apply equally to all modes. If there is a regression with any other mode it should be a different root cause. If you feel comfortable doing so please add a "Tested-by" tag publicly on the link I posted, instructions at bottom of the page.
(In reply to Mario Limonciello (AMD) from comment #32) > I've pulled out just the relevant fix to it's own patch here: > > https://lore.kernel.org/linux-pm/20240507174810.46709-1-mario. > limonciello@amd.com/T/#u > > I applied that to 6.9-rc7 and tested it. Can you see if that helps you? Tested-by: Gaha Bana <gahabana@gmail.com>
(In reply to Mario Limonciello (AMD) from comment #34) > Great! It should apply equally to all modes. If there is a regression with > any other mode it should be a different root cause. > > If you feel comfortable doing so please add a "Tested-by" tag publicly on > the link I posted, instructions at bottom of the page. I tried in 'guided' mode and all is still perfect. Hope my response/tested-by is satisfactory - if not please advise on how to do it properly! Tx again Mario !