Hi, On 2023-12-07 02:41:34 +0000, Zhang, Rui wrote: > On Tue, 2023-12-05 at 22:58 -0800, Andres Freund wrote: > > Hi, > > > > On 2023-12-01 08:31:48 +0000, Zhang, Rui wrote: > > > As a quick fix, I'm not going to fix the "potential issue" > > > describes > > > above because we have not seen a real problem caused by this yet. > > > > > > Can you please try the below patch to confirm if the problem is > > > gone on > > > your system? > > > This patch falls back to the previous way as sent at > > > https://lore.kernel.org/lkml/87pm4bp54z.ffs@tglx/T/ > > > > > > I've just spent a couple hours bisecting why upgrading to 6.7-rc4 > > left me with > > just a single CPU core on my dual socket workstation. > > > > > > before: > > [ 0.000000] Linux version 6.6.0-andres-00003-g31255e072b2e ... > > ... > > [ 0.022960] ACPI: Using ACPI (MADT) for SMP configuration > > information > > ... > > [ 0.022968] smpboot: Allowing 40 CPUs, 0 hotplug CPUs > > ... > > [ 0.345921] smpboot: CPU0: Intel(R) Xeon(R) Gold 5215 CPU @ > > 2.50GHz (family: 0x6, model: 0x55, stepping: 0x7) > > ... > > [ 0.347229] .... node #0, CPUs: #1 #2 #3 #4 #5 #6 > > #7 #8 #9 > > [ 0.349082] .... node #1, CPUs: #10 #11 #12 #13 #14 #15 #16 #17 > > #18 #19 > > [ 0.003190] smpboot: CPU 10 Converting physical 0 to logical die 1 > > > > [ 0.361053] .... node #0, CPUs: #20 #21 #22 #23 #24 #25 #26 #27 > > #28 #29 > > [ 0.363990] .... node #1, CPUs: #30 #31 #32 #33 #34 #35 #36 #37 > > #38 #39 > > ... > > [ 0.370886] smp: Brought up 2 nodes, 40 CPUs > > [ 0.370891] smpboot: Max logical packages: 2 > > [ 0.370896] smpboot: Total of 40 processors activated (200000.00 > > BogoMIPS) > > [ 0.403905] node 0 deferred pages initialised in 32ms > > [ 0.408865] node 1 deferred pages initialised in 37ms > > > > > > after: > > [ 0.000000] Linux version 6.6.0-andres-00004-gec9aedb2aa1a ... > > ... > > [ 0.022935] ACPI: Using ACPI (MADT) for SMP configuration > > information > > ... > > [ 0.022942] smpboot: Allowing 1 CPUs, 0 hotplug CPUs > > ... > > [ 0.356424] smpboot: CPU0: Intel(R) Xeon(R) Gold 5215 CPU @ > > 2.50GHz (family: 0x6, model: 0x55, stepping: 0x7) > > ... > > [ 0.357098] smp: Bringing up secondary CPUs ... > > [ 0.357107] smp: Brought up 2 nodes, 1 CPU > > [ 0.357108] smpboot: Max logical packages: 1 > > [ 0.357110] smpboot: Total of 1 processors activated (5000.00 > > BogoMIPS) > > [ 0.726283] node 0 deferred pages initialised in 368ms > > [ 0.774704] node 1 deferred pages initialised in 418ms > > > > > > There does seem to be something off with the ACPI data, when booting > > without > > the patch, > > which patch are you referring to? the original patch in this thread? Yes, the the original patch / the state in 6.7-rc4. > Does the second patch fixes the problem? I mean the patch at > https://lore.kernel.org/all/904ce2b870b8a7f34114f93adc7c8170420869d1.camel@xxxxxxxxx/ Yes. Greetings, Andres Freund
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