Subj : epyc
To   : Benny Pedersen
From : Maurice Kinal
Date : Fri Aug 04 2023 09:29 pm

Hey Benny!

This is a zen1 cpu and not zen2 as earlier reported.  It works for me.  :-)

 :r !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
Model name:                      AMD EPYC 3251 8-Core Processor
CPU family:                      23
Model:                           1
Thread(s) per core:              2
Core(s) per socket:              8
Socket(s):                       1
Stepping:                        2
Frequency boost:                 enabled
CPU(s) scaling MHz:              48%
CPU max MHz:                     2500.0000
CPU min MHz:                     1200.0000
BogoMIPS:                        5000.26
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 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 skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate ssbd ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca
Virtualization:                  AMD-V
L1d cache:                       256 KiB (8 instances)
L1i cache:                       512 KiB (8 instances)
L2 cache:                        4 MiB (8 instances)
L3 cache:                        16 MiB (2 instances)
NUMA node(s):                    1
NUMA node0 CPU(s):               0-15
Vulnerability Itlb multihit:     Not affected
Vulnerability L1tf:              Not affected
Vulnerability Mds:               Not affected
Vulnerability Meltdown:          Not affected
Vulnerability Mmio stale data:   Not affected
Vulnerability Retbleed:          Mitigation; untrained return thunk; SMT vulnerable
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:        Mitigation; Retpolines, IBPB conditional, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected
Vulnerability Srbds:             Not affected
Vulnerability Tsx async abort:   Not affected

 :r !uname -a
Linux amiitoo 6.4.8 #1 SMP PREEMPT_DYNAMIC Fri Aug  4 15:16:29 UTC 2023 x86_64 GNU/Linux

Note that it reports x86_64 which is the same for the Ryzens (and Intels) as I've been optimizing for that.  This kernel can boot on any machine here.  I think this is better output;

 :r /proc/version
Linux version 6.4.8 (root@amiitoo) (gcc (GCC) 13.2.0, GNU ld (GNU Binutils) 2.41) #1 SMP PREEMPT_DYNAMIC Fri Aug  4 15:16:29 UTC 2023

Life is good,
Maurice

 o-  -o   -o    o-   o-  -o   -o    o-  -o    o-   o-  -o    o-  -o    o-   o-
/)    (\   (\  /)   /)    (\   (\  /)    (\  /)   /)    (\  /)    (\  /)   /)
^^    ^^   ^^  ^^   ^^    ^^   ^^  ^^    ^^  ^^   ^^    ^^  ^^    ^^  ^^   ^^
.... Fidonet Unplugged - One in a million.
--- GNU bash, version 5.2.15(1)-release (x86_64-pc-linux-gnu)
 * Origin: One of us @ (1:153/7001.53423)

.