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

Paul Menzel
2023-04-17T12:02:14Z

[Correct David’s address]

Am 17.04.23 um 13:19 schrieb Paul Menzel:
> Dear Thomas,
>
>
> Am 15.04.23 um 01:44 schrieb Thomas Gleixner:
>
>> This is a complete rework of the parallel bringup patch series (V17)
>>
>>
>> https://lore.kernel.org/lkml/20230328195758.1049469-1-usama.arif@bytedance.com
>>
>> to address the issues which were discovered in review:
>
> […]
>
> Thank you very much for your rework.
>
> I tested this on the ASUS F2A85-M PRO, and get a delay of ten seconds.
>
> ```
> […]
> [    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
> [   10.261070] smp: Brought up 1 node, 1 CPU
> [   10.261073] smpboot: Max logical packages: 2
> [   10.261074] smpboot: Total of 1 processors activated (7800.54 BogoMIPS)
> [   10.261601] devtmpfs: initialized
> [   10.261697] x86/mm: Memory block size: 128MB
> ```
>
> This delay has been there with v6.3-rc6-46-gde4664485abbc and some
> custom (printk) patches on top and merging dwmw2/parallel-6.2-rc3-v16
> into it. I only tested this. I think dwmw2/parallel-6.2-v17 failed to
> build for me, when trying to merge it into Linus’ master version at that
> time. I didn’t come around to report it, and you posted your rework, so
> I am replying here.
>
> I am going to try your branch directly in the next days, but just wanted
> to report back already.
>
>
> Kind regards,
>
> Paul