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Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup
- To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- From: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
- Date: Mon, 17 Apr 2023 19:40:53 +0200
- Cc: linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Arjan van de Veen <arjan@xxxxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Paul McKenney <paulmck@xxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>, "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxx>, Piotr Gorski <lucjan.lucjanov@xxxxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>, Usama Arif <usama.arif@xxxxxxxxxxxxx>, Jürgen Groß <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Russell King <linux@xxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Guo Ren <guoren@xxxxxxxxxx>, linux-csky@xxxxxxxxxxxxxxx, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, linux-mips@xxxxxxxxxxxxxxx, "James E. J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, linux-riscv@xxxxxxxxxxxxxxxxxxx, Mark Rutland <mark.rutland@xxxxxxx>, Sabin Rapan <sabrapan@xxxxxxxxxx>
- Delivery-date: Mon, 17 Apr 2023 17:41:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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@xxxxxxxxxxxxx/Attachment:
kodi-linux-6.3-rc6-smp-tglx-cpuhp.paralleloff.txt
Description: Text document
|
