Messages in this thread | | | Date | Mon, 20 Feb 2023 22:23:38 +0100 | From | Oleksandr Natalenko <> | Subject | Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64 |
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Hello.
On 20.02.2023 21:31, David Woodhouse wrote: > On Mon, 2023-02-20 at 17:40 +0100, Oleksandr Natalenko wrote: >> On pondělí 20. února 2023 17:20:13 CET David Woodhouse wrote: >> > On Mon, 2023-02-20 at 17:08 +0100, Oleksandr Natalenko wrote: >> > > >> > > I've applied this to the v6.2 kernel, and suspend/resume broke on >> > > my >> > > Ryzen 5950X desktop. The machine suspends just fine, but on >> > > resume >> > > the screen stays blank, and there's no visible disk I/O. >> > > >> > > Reverting the series brings suspend/resume back to working state. >> > >> > Hm, thanks. What if you add 'no_parallel_bringup' on the command >> > line? >> >> If the `no_parallel_bringup` param is added, the suspend/resume >> works. > > Thanks for the testing. Can I ask you to do one further test: apply the > series only as far as patch 6/8 'x86/smpboot: Support parallel startup > of secondary CPUs'. > > That will do the new startup asm sequence where each CPU finds its own > per-cpu data so it *could* work in parallel, but doesn't actually do > the bringup in parallel yet.
With patches 1 to 6 (including) applied and no extra cmdline params added the resume doesn't work.
> Does your box have a proper serial port?
No, sorry. I know it'd help with getting logs, and I do have a serial-to-USB cable that I use for another machine, but in this one the port is not routed to outside. I think I can put a header there as the motherboard does have pins, but I'd have to buy one first. In theory, I can do that, but that won't happen within the next few weeks.
P.S. Piotr Gorski (in Cc) also reported this: "My friend from CachyOS can confirm bugs with smpboot patches. AMD FX 6300 only shows 1 core when using smp boot patchset". Probably, he can reply to this thread and provide more details.
-- Oleksandr Natalenko (post-factum)
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