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<k...@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.land...@gmail.com
t: @hpcjoe
w:https://scalability.org
g:https://github.com/joelandman
l:https://www.linkedin.com/in/joelandman
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