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Groups > linux.debian.kernel > #69688

Bug#983923: linux-image-4.19.0-13-cloud-amd64: Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel

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On Wed, Mar 03, 2021 at 05:35:42PM +0100, Louis Bouchard wrote:
> Thank you for the quick update. I just want to mention that this makes the
> Debian Buster cloud image unusable for any VM with more than 64 cpus.

Is it the number of physical cores that matters, rather than the SMT
threads?  Because on a 96 core SMT system, it works today:

admin@ip-10-0-0-75:~$ uname -a && ec2metadata --instance-type && lscpu
Linux ip-10-0-0-75 4.19.0-14-cloud-amd64 #1 SMP Debian 4.19.171-2 (2021-01-30) x86_64 GNU/Linux
m5a.24xlarge
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
Address sizes:       48 bits physical, 48 bits virtual
CPU(s):              96
On-line CPU(s) list: 0-95
Thread(s) per core:  2
Core(s) per socket:  24
Socket(s):           2
NUMA node(s):        6
Vendor ID:           AuthenticAMD
CPU family:          23
Model:               1
Model name:          AMD EPYC 7571
Stepping:            2
CPU MHz:             2550.330
BogoMIPS:            4399.61
Hypervisor vendor:   KVM
Virtualization type: full
L1d cache:           32K
L1i cache:           64K
L2 cache:            512K
L3 cache:            8192K
NUMA node0 CPU(s):   0-7,48-55
NUMA node1 CPU(s):   8-15,56-63
NUMA node2 CPU(s):   16-23,64-71
NUMA node3 CPU(s):   24-31,72-79
NUMA node4 CPU(s):   32-39,80-87
NUMA node5 CPU(s):   40-47,88-95
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 amd_dcm aperfmperf tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch topoext perfctr_core vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr arat npt nrip_save

Do any of the cloud providers supported by the cloud kernel build
(primarily AWS and Azure) offer VMs with >64 physical cores?

noah

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Bug#983923: linux-image-4.19.0-13-cloud-amd64: Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel Louis Bouchard <lbouchard@scaleway.com> - 2021-03-03 15:00 +0100
  Bug#983923: linux-image-4.19.0-13-cloud-amd64: Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel Louis Bouchard <lbouchard@scaleway.com> - 2021-03-03 17:40 +0100
    Bug#983923: linux-image-4.19.0-13-cloud-amd64: Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel Noah Meyerhans <noahm@debian.org> - 2021-03-03 18:30 +0100
      Bug#983923: linux-image-4.19.0-13-cloud-amd64: Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel Louis Bouchard <lbouchard@scaleway.com> - 2021-03-04 13:00 +0100
        Bug#983923: linux-image-4.19.0-13-cloud-amd64: Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel Salvatore Bonaccorso <carnil@debian.org> - 2021-03-05 13:40 +0100
  Bug#983923: linux-image-4.19.0-13-cloud-amd64: Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel Salvatore Bonaccorso <carnil@debian.org> - 2021-03-03 17:40 +0100
  Bug#983923: marked as done (linux-image-4.19.0-13-cloud-amd64:  Please add CONFIG_MAXSMP to the linux-image-cloud-amd64 kernel) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-03-05 13:40 +0100

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