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From: David Woodhouse <dwmw2@infradead.org>
To: Russ Anderson <rja@hpe.com>, Usama Arif <usama.arif@bytedance.com>
Cc: tglx@linutronix.de, arjan@linux.intel.com, mingo@redhat.com,
	bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com,
	x86@kernel.org, pbonzini@redhat.com, paulmck@kernel.org,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com,
	thomas.lendacky@amd.com, seanjc@google.com,
	pmenzel@molgen.mpg.de, fam.zheng@bytedance.com,
	punit.agrawal@bytedance.com, simon.evans@bytedance.com,
	liangma@liangbit.com
Subject: Re: [PATCH v6 00/11] Parallel CPU bringup for x86_64
Date: Mon, 06 Feb 2023 08:28:34 +0000	[thread overview]
Message-ID: <3b626936ccc4d5123cb9113378bec6f77182def3.camel@infradead.org> (raw)
In-Reply-To: <20230205191734.GA6027@hpe.com>

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On Sun, 2023-02-05 at 13:17 -0600, Russ Anderson wrote:
> 
> Gave the v6 patchset a try on a system with 1920 logocal cpus
> (sixteen 60 core Sapphire Rapids sockets with Hyperthreadding
> enabled).
> 
> Without the patchset it took 71 seconds to start all the cpus.
> With the v6 patchset it took 14 seconds to start all the cpus,
> a reduction of 57 seconds.  That is impressive.
> 
> Full boot, to root login prompt, without patches takes 223 seconds.
> This patchset reduces the full boot time by 57 seconds, a 25%
> reduction.

Nice; thanks for testing.

Is that with just the "part1" patch series which has been posted, or
also with the 'parallel part 2' still taking shape in the tree at
https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/parallel-6.2-rc6

I believe Usama said the second phase of parallelism didn't really help
much in terms of overall timing? Confirming that *without* all the
debug prints would be interesting. And we can look for what still
*could* be made parallel.

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  reply	other threads:[~2023-02-06  8:29 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-02 21:56 [PATCH v6 00/11] Parallel CPU bringup for x86_64 Usama Arif
2023-02-02 21:56 ` [PATCH v6 01/11] x86/apic/x2apic: Fix parallel handling of cluster_mask Usama Arif
2023-02-06 23:20   ` Thomas Gleixner
2023-02-07 10:57     ` David Woodhouse
2023-02-07 11:27       ` David Woodhouse
2023-02-07 14:24         ` Thomas Gleixner
2023-02-07 19:53           ` David Woodhouse
2023-02-07 20:58             ` Thomas Gleixner
2023-02-07 14:22       ` Thomas Gleixner
2023-02-02 21:56 ` [PATCH v6 02/11] cpu/hotplug: Move idle_thread_get() to <linux/smpboot.h> Usama Arif
2023-02-06 23:33   ` Thomas Gleixner
2023-02-07  1:24     ` Paul E. McKenney
2023-02-02 21:56 ` [PATCH v6 03/11] cpu/hotplug: Add dynamic parallel bringup states before CPUHP_BRINGUP_CPU Usama Arif
2023-02-06 23:43   ` Thomas Gleixner
2023-02-02 21:56 ` [PATCH v6 04/11] x86/smpboot: Reference count on smpboot_setup_warm_reset_vector() Usama Arif
2023-02-06 23:48   ` Thomas Gleixner
     [not found]     ` <57195f701f6d1d70ec440c9a28cbee4cfb81dc41.camel@amazon.co.uk>
2023-02-07 14:39       ` Thomas Gleixner
2023-02-07 16:50         ` Sean Christopherson
2023-02-07 19:48         ` [EXTERNAL][PATCH " David Woodhouse
2023-02-02 21:56 ` [PATCH v6 05/11] x86/smpboot: Split up native_cpu_up into separate phases and document them Usama Arif
2023-02-06 23:59   ` Thomas Gleixner
2023-02-02 21:56 ` [PATCH v6 06/11] x86/smpboot: Support parallel startup of secondary CPUs Usama Arif
2023-02-02 22:30   ` David Woodhouse
2023-02-02 22:50     ` [External] " Usama Arif
2023-02-03  8:14       ` David Woodhouse
2023-02-03 14:41         ` Arjan van de Ven
2023-02-03 18:17   ` Sean Christopherson
2023-02-07  0:07   ` Thomas Gleixner
2023-02-02 21:56 ` [PATCH v6 07/11] x86/smpboot: Disable parallel boot for AMD CPUs Usama Arif
2023-02-03 19:48   ` Kim Phillips
     [not found]     ` <d5ec64236ba75f0d3f3718fb69b2cb9169d8af0a.camel@amazon.co.uk>
2023-02-03 21:45       ` Kim Phillips
2023-02-03 22:25         ` [EXTERNAL][PATCH " David Woodhouse
2023-02-04  9:07     ` [PATCH " David Woodhouse
2023-02-04 10:09     ` David Woodhouse
2023-02-04 15:40     ` David Woodhouse
2023-02-04 18:18       ` Arjan van de Ven
2023-02-04 22:31         ` David Woodhouse
2023-02-05 22:13           ` [External] " Usama Arif
2023-02-06  8:05             ` David Woodhouse
2023-02-06 12:11               ` Usama Arif
2023-02-06 18:07                 ` Sean Christopherson
2023-02-06 17:58       ` Kim Phillips
2023-02-07 16:27         ` Kim Phillips
2023-02-07  0:23       ` Thomas Gleixner
2023-02-07 10:04         ` David Woodhouse
2023-02-07 14:44           ` Thomas Gleixner
2023-02-07  0:09   ` Thomas Gleixner
     [not found]     ` <cbd9e88e738dc0c479e87121ca82431731905c73.camel@amazon.co.uk>
2023-02-07 14:46       ` Thomas Gleixner
2023-02-02 21:56 ` [PATCH v6 08/11] x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel Usama Arif
2023-02-07  0:28   ` Thomas Gleixner
2023-02-02 21:56 ` [PATCH v6 09/11] x86/mtrr: Avoid repeated save of MTRRs on boot-time CPU bringup Usama Arif
2023-02-02 21:56 ` [PATCH v6 10/11] x86/smpboot: Serialize topology updates for secondary bringup Usama Arif
2023-02-02 21:56 ` [PATCH v6 11/11] x86/smpboot: reuse timer calibration Usama Arif
2023-02-07  0:31   ` Thomas Gleixner
2023-02-07 23:16   ` Arjan van de Ven
2023-02-07 23:55     ` Thomas Gleixner
2023-02-05 19:17 ` [PATCH v6 00/11] Parallel CPU bringup for x86_64 Russ Anderson
2023-02-06  8:28   ` David Woodhouse [this message]
2023-02-06 12:18     ` [External] " Usama Arif

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