Date: Wed, 13 Mar 2019 18:58:48 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 236513] Different power states (C1/C2/...) per CPU core Message-ID: <bug-236513-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236513 Bug ID: 236513 Summary: Different power states (C1/C2/...) per CPU core Product: Base System Version: 11.2-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: stockhausen@collogia.de Created attachment 202845 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=202845&action=edit dmesg Hi, we are running FreeBSD 11.2-RELEASE-p6 on a HP T620 Thin client. Trying to enable power saving through C states we noticed that the system presents different states for the cores: sysctl -a | grep cx_supported dev.cpu.3.cx_supported: C1/1/0 dev.cpu.2.cx_supported: C1/1/0 dev.cpu.1.cx_supported: C1/1/0 dev.cpu.0.cx_supported: C1/1/0 C2/2/400 Enabling C2 state on CPU shows that it seems to work quite well: sysctl -a | grep cx_usage: dev.cpu.3.cx_usage: 100.00% last 34923us dev.cpu.2.cx_usage: 100.00% last 10us dev.cpu.1.cx_usage: 100.00% last 3853us dev.cpu.0.cx_usage: 5.54% 94.45% last 33us CPU details: CPU: AMD GX-420CA SOC with Radeon(tm) HD Graphics (1996.29-MHz K8-class CPU) Origin="AuthenticAMD" Id=0x700f01 Family=0x16 Model=0x0 Stepping=1 Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT> Features2=0x3ed8220b<SSE3,PCLMULQDQ,MON,SSSE3,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,F16C> AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM> AMD Features2=0x154037ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT,Topology,PNXC,DBE,PL2I> Structured Extended Features=0x8<BMI1> XSAVE Features=0x1<XSAVEOPT> SVM: (disabled in BIOS) NP,NRIP,AFlush,DAssist,NAsids=8 TSC: P-state invariant, performance statistics Is this the expected behaviour? dmesg log attached. -- You are receiving this mail because: You are the assignee for the bug.
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