Re: Ryzen public erratas (and Epyc ?)

On Thursday, June 14, 2018, Mike Tancsa <mike_at_sentex.net> wrote:

> On 6/14/2018 11:03 AM, Konstantin Belousov wrote:
> > I am not sure about only microcode update.  Depending on the BIOS
> > vendor and current BIOS, you may need all three: BIOS update, microcode
> > update using cpucontrol/devcpu-data, and running the script I posted.
> > In the best case, some of this is just redundand.
>
> OK, before and after shows the same microcode rev
>
> CPU: AMD EPYC 7281 16-Core Processor                 (2100.06-MHz
> K8-class CPU)
>   Origin="AuthenticAMD"  Id=0x800f12  Family=0x17  Model=0x1  Stepping=2
>
> 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=0x7ed8320b<SSE3,PCLMULQDQ,MON,SSSE3,FMA,CX16,
> SSE4.1,SSE4.2,MOVBE,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
>   AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
>   AMD
> Features2=0x35c233ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,
> Prefetch,OSVW,SKINIT,WDT,TCE,Topology,PCXC,PNXC,DBE,PL2I,MWAITX>
>   Structured Extended
> Features=0x209c01a9<FSGSBASE,BMI1,AVX2,SMEP,BMI2,RDSEED,
> ADX,SMAP,CLFLUSHOPT,SHA>
>   XSAVE Features=0xf<XSAVEOPT,XSAVEC,XINUSE,XSAVES>
>   AMD Extended Feature Extensions ID EBX=0x1007<CLZERO,IRPerf,XSaveErPtr>
>   SVM: NP,NRIP,VClean,AFlush,DAssist,NAsids=32768
>   TSC: P-state invariant, performance statistics
>
>  # x86info -a | grep -i micro
> Microcode patch level: 0x8001227
>  #
>
> I then ran the fix script.  I will let the box grind away over the
> weekend to see if it survives. Previously, a couple of hours would lock
> it up. I am running it now.  One thing I did notice is a bunch of these
> showing up
>
> Jun 14 17:11:18 r11epyc kernel: fpudna: fpcurthread == curthread


This is a side effect of enabled eager FPU switch, it's orthogonal and
already fixed - the printf has been removed - in current.


>
>
>         ---Mike
>
> --
> -------------------
> Mike Tancsa, tel +1 519 651 3400 x203
> Sentex Communications, mike_at_sentex.net
> Providing Internet services since 1994 www.sentex.net
> Cambridge, Ontario Canada
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