[Beowulf] milan and rhel7

[Joe Landman]

Egads ... if you are still running a 3 series kernel in production ... 
backports or not ... .  The user space stack around that kernel 
(RHEL/CentOS 7) is positively prehistoric.

I'm quite serious about this.  The 4.x series are old now.

New hardware comes out requiring new support in the kernel all the 
time.  If you don't provide for a sufficiently up to date kernel with 
associated drivers, and changed kernel structures to correctly use these 
things, I'd say its a crap shoot as to whether or not it would work at 
all, never mind with its full capability.


On 6/29/22 09:52, Kilian Cavalotti wrote:
> On Wed, Jun 29, 2022 at 3:54 AM Mikhail Kuzminsky<kus at free.net>  wrote:
>> Yes, RHEL requires upgrading to 8.3 or later to work with EPYC 7003
>> https://access.redhat.com/articles/5899941. Officially CentOS 7
>> doesn't support this hardware either.
> And yet, Red Hat silently backports Milan-specific bits to 7.9 kernels, like:
> - Rudimentary support for AMD Milan - Call init_amd_zn() om Family 19h
> processors (BZ#2019218)
> in kernel-3.10.0-1160.53.1 (https://access.redhat.com/errata/RHSA-2022:0063)
>
> So yes, in practice, el7 distributions run perfectly fine on Milan
> CPUs. You won't have complete support for things like EDAC, but as far
> as booting and running the kernel, it works fine:
>
> # uname -r
> 3.10.0-1160.53.1.el7.x86_64
>
> # lscpu -y
> Architecture:          x86_64
> CPU op-mode(s):        32-bit, 64-bit
> Byte Order:            Little Endian
> CPU(s):                32
> On-line CPU(s) list:   0-31
> Thread(s) per core:    1
> Core(s) per socket:    32
> Socket(s):             1
> NUMA node(s):          2
> Vendor ID:             AuthenticAMD
> CPU family:            25
> Model:                 1
> Model name:            AMD EPYC 7543 32-Core Processor
> Stepping:              1
> CPU MHz:               2794.847
> BogoMIPS:              5589.69
> Virtualization:        AMD-V
> L1d cache:             32K
> L1i cache:             32K
> L2 cache:              512K
> L3 cache:              32768K
> NUMA node0 CPU(s):     0-15
> NUMA node1 CPU(s):     16-31
> 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 art rep_good nopl
> nonstop_tsc extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor
> ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic 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_l2 cpb cat_l3 cdp_l3 invpcid_single hw_pstate
> sme retpoline_amd ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep
> bmi2 invpcid cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt
> xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local
> clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale
> vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
> v_vmsave_vmload vgif umip pku ospke vaes vpclmulqdq overflow_recov
> succor smca
>
> Cheers,

-- 
Joe Landman
e:joe.landman at gmail.com
t: @hpcjoe
w:https://scalability.org
g:https://github.com/joelandman
l:https://www.linkedin.com/in/joelandman
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