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From: Tom Lendacky <thomas.lendacky@amd.com>
To: David Woodhouse <dwmw2@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com,
	hushiyuan@huawei.com, luolongjun@huawei.com,
	hejingxian@huawei.com
Subject: Re: [PATCH v3 0/9] Parallel CPU bringup for x86_64
Date: Thu, 16 Dec 2021 10:27:40 -0600	[thread overview]
Message-ID: <761c1552-0ca0-403b-3461-8426198180d0@amd.com> (raw)
In-Reply-To: <20211215145633.5238-1-dwmw2@infradead.org>

On 12/15/21 8:56 AM, David Woodhouse wrote:
> Doing the INIT/SIPI/SIPI in parallel for all APs and *then* waiting for
> them shaves about 80% off the AP bringup time on a 96-thread socket
> Skylake box (EC2 c5.metal) — from about 500ms to 100ms.
> 
> There are more wins to be had with further parallelisation, but this is
> the simple part.

I applied this series and began booting a regular non-SEV guest and hit a 
failure at 39 vCPUs. No panic or warning, just a reset and OVMF was 
executing again. I'll try to debug what's going, but not sure how quickly 
I'll arrive at anything.

Thanks,
Tom


  parent reply	other threads:[~2021-12-16 16:27 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-15 14:56 [PATCH v3 0/9] Parallel CPU bringup for x86_64 David Woodhouse
2021-12-15 14:56 ` [PATCH v3 1/9] x86/apic/x2apic: Fix parallel handling of cluster_mask David Woodhouse
2021-12-15 14:56 ` [PATCH v3 2/9] cpu/hotplug: Move idle_thread_get() to <linux/smpboot.h> David Woodhouse
2021-12-15 14:56 ` [PATCH v3 3/9] cpu/hotplug: Add dynamic parallel bringup states before CPUHP_BRINGUP_CPU David Woodhouse
2021-12-15 14:56 ` [PATCH v3 4/9] x86/smpboot: Reference count on smpboot_setup_warm_reset_vector() David Woodhouse
2021-12-15 14:56 ` [PATCH v3 5/9] x86/smpboot: Split up native_cpu_up into separate phases and document them David Woodhouse
2021-12-15 14:56 ` [PATCH v3 6/9] x86/smpboot: Support parallel startup of secondary CPUs David Woodhouse
2021-12-16 14:24   ` Tom Lendacky
2021-12-16 18:24     ` David Woodhouse
2021-12-16 19:00       ` Tom Lendacky
2021-12-16 19:20         ` David Woodhouse
2022-01-29 12:04           ` David Woodhouse
2022-01-31 13:59             ` Borislav Petkov
2022-02-01 10:25               ` David Woodhouse
2022-02-01 10:56                 ` Borislav Petkov
2022-02-01 12:39                   ` David Woodhouse
2022-02-01 12:56                     ` Borislav Petkov
2022-02-01 13:02                       ` David Woodhouse
2021-12-15 14:56 ` [PATCH v3 7/9] x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel David Woodhouse
2021-12-15 14:56 ` [PATCH v3 8/9] x86/mtrr: Avoid repeated save of MTRRs on boot-time CPU bringup David Woodhouse
2021-12-15 14:56 ` [PATCH v3 9/9] x86/smpboot: Serialize topology updates for secondary bringup David Woodhouse
2021-12-16 16:27 ` Tom Lendacky [this message]
2021-12-16 19:24   ` [PATCH v3 0/9] Parallel CPU bringup for x86_64 David Woodhouse
2021-12-16 22:52     ` Tom Lendacky
2021-12-17  0:13       ` David Woodhouse
2021-12-17 10:09         ` Igor Mammedov
2021-12-17 15:40           ` David Woodhouse
2021-12-20 17:10           ` David Woodhouse
2021-12-20 18:54             ` Tom Lendacky
2021-12-20 21:29               ` David Woodhouse
2021-12-20 21:47                 ` Tom Lendacky
2021-12-21 22:25                   ` Tom Lendacky
2021-12-21 22:33                     ` David Woodhouse
2021-12-17 17:48         ` Tom Lendacky
2021-12-17 19:11           ` David Woodhouse
2021-12-17 19:26             ` David Woodhouse
2021-12-17 20:15               ` Tom Lendacky
2021-12-17 19:46             ` Tom Lendacky
2021-12-17 20:13               ` David Woodhouse
2021-12-17 20:55                 ` Tom Lendacky
2021-12-17 22:48                   ` David Woodhouse
2022-01-28  9:54                   ` David Woodhouse
2022-01-28 21:40                     ` Sean Christopherson
2022-01-28 21:48                       ` David Woodhouse
2022-01-29  9:22                       ` David Woodhouse
2021-12-16 19:52   ` David Woodhouse
2021-12-16 19:55     ` Tom Lendacky
2021-12-16 19:59       ` David Woodhouse
2021-12-27 16:57 ` Paul Menzel
2021-12-28 11:34   ` Paul Menzel
2021-12-28 14:18     ` David Woodhouse
2021-12-29 13:18       ` Paul Menzel
2021-12-29 13:54         ` David Woodhouse
2022-02-14 13:45           ` Paul Menzel
2022-04-21 10:00             ` Mimoja
2022-04-22 21:19               ` Tom Lendacky
2022-06-01  8:30                 ` David Woodhouse

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