linux-kernel - Re: [PATCH v12 00/11] Parallel CPU bringup for x86

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Date:   Tue, 28 Feb 2023 09:04:39 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Usama Arif <usama.arif@...edance.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>, brgerst@...il.com,
        dave.hansen@...ux.intel.com, fam.zheng@...edance.com,
        hewenliang4@...wei.com, "H. Peter Anvin" <hpa@...or.com>,
        kim.phillips@....com, kvm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, liangma@...ngbit.com,
        mimoja@...oja.de, oleksandr@...alenko.name,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>, piotrgorski@...hyos.org,
        punit.agrawal@...edance.com, rcu@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        simon.evans@...edance.com, Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <Thomas.Lendacky@....com>, x86@...nel.org
Subject: Re: [PATCH v12 00/11] Parallel CPU bringup for x86_64

On 28/02/2023 07:13, Paul Menzel wrote:
> Dear Guilherme,
> 
> 
> Am 27.02.23 um 22:39 schrieb Guilherme G. Piccoli:
> 
>> I've tested it on Steam Deck (with and without the "no_parallel_bringup"
>> parameter), it works fine - also tested S3/deep sleep-resume cycle.
>>
>> Feel free to add (to the series):
>> Tested-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
> 
> Thank you for testing the series. It’d be great if you could share the 
> timing differences.
> 
> […]
> 
> 
> Kind regards,
> 
> Paul

Hi Paul!

The results...weren't so great, I felt no difference heh
Which is also not bad, it seems the series favors big SMP systems, Deck
has only 8 CPUs.

But maybe the way I measured is not ideal? I just compared timestamps on
dmesg from the first SMP message up to the one that says the boot of
secondary CPUs is complete. Do you have a better suggestion? I can try
things here.

Cheers,


Guilherme