linux-kernel - Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

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Message-ID: <bd5a6a93-def1-9248-2258-c3d3b40071ef@molgen.mpg.de>
Date:   Mon, 17 Apr 2023 19:40:53 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        David Woodhouse <dwmw2@...radead.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Brian Gerst <brgerst@...il.com>,
        Arjan van de Veen <arjan@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul McKenney <paulmck@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Piotr Gorski <lucjan.lucjanov@...il.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Usama Arif <usama.arif@...edance.com>,
        Jürgen Groß <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        linux-csky@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        "James E. J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Sabin Rapan <sabrapan@...zon.com>
Subject: Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

Dear Thomas,


Am 17.04.23 um 16:48 schrieb Thomas Gleixner:

> On Mon, Apr 17 2023 at 13:19, Paul Menzel wrote:
>> Am 15.04.23 um 01:44 schrieb Thomas Gleixner:
>> [    0.258193] smpboot: CPU0: AMD A6-6400K APU with Radeon(tm) HD
>> Graphics (family: 0x15, model: 0x13, stepping: 0x1)
>> […]
>> [    0.259329] smp: Bringing up secondary CPUs ...
>> [    0.259527] x86: Booting SMP configuration:
>> [    0.259528] .... node  #0, CPUs:      #1
>> [    0.261007] After schedule_preempt_disabled
>> [   10.260990] CPU1 failed to report alive state
> 
> Weird. CPU1 fails to come up and report that it has reached the
> synchronization point.
> 
> Does it work when you add cpuhp.parallel=off on the kernel command line?

Yes, the ten seconds delay is gone with `cpuhp.parallel=off`.

There was a patch set in the past, that worked on that device. I think 
up to v4 it did *not* work at all and hung [1]. I need some days to 
collect the results again.


Kind regards,

Paul


[1]: 
https://lore.kernel.org/lkml/ab28d2ce-4a9c-387d-9eda-558045a0c35b@molgen.mpg.de/
View attachment "kodi-linux-6.3-rc6-smp-tglx-cpuhp.paralleloff.txt" of type "text/plain" (61806 bytes)