linux-kernel - Re: nr_cpu_ids vs AMD 3970x(32 physical CPUs)

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Date:   Fri, 3 Jul 2020 21:28:07 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     peter enderborg <peter.enderborg@...y.com>
Cc:     Uladzislau Rezki <urezki@...il.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        GregKroah-Hartmangregkh@...uxfoundation.org, peterz@...radead.org
Subject: Re: nr_cpu_ids vs AMD 3970x(32 physical CPUs)

> > Hello, folk.
> >
> > I have a system based on AMD 3970x CPUs. It has 32 physical cores
> > and 64 threads. It seems that "nr_cpu_ids" variable is not correctly
> > set on latest 5.8-rc3 kernel. Please have a look below on dmesg output:
> >
> > <snip>
> > urezki@...38:~$ sudo dmesg | grep 128
> > [    0.000000] IOAPIC[0]: apic_id 128, version 33, address 0xfec00000, GSI 0-23
> > [    0.000000] smpboot: Allowing 128 CPUs, 64 hotplug CPUs
> > [    0.000000] setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:128 nr_node_ids:1
> 
> My 3950 do
> 
> 
> [    0.005271] ACPI: SSDT 0x00000000CA1F5000 0003F1 (v02 ALASKA CPUSSDT  01072009 AMI  01072009)
> [    0.108266] smpboot: Allowing 32 CPUs, 0 hotplug CPUs
> [    0.111384] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:32 nr_cpu_ids:32 nr_node_ids:1
> 
> (Fedora F32  5.6.18-300) What motherboard and BIOs do you use?
> 
I have MSI TRX40 with latest BIOS.

--
Vlad Rezki