From: Sohil Mehta <sohil.mehta@intel.com>
To: Dave Hansen <dave.hansen@intel.com>, <x86@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Tony Luck <tony.luck@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
"Kan Liang" <kan.liang@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Len Brown <lenb@kernel.org>, Andy Lutomirski <luto@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
Zhang Rui <rui.zhang@intel.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
"David Laight" <david.laight.linux@gmail.com>,
<linux-perf-users@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-acpi@vger.kernel.org>,
<linux-pm@vger.kernel.org>, <linux-hwmon@vger.kernel.org>
Subject: Re: [PATCH v2 02/17] x86/smpboot: Fix INIT delay optimization for extended Intel Families
Date: Tue, 11 Feb 2025 12:20:02 -0800 [thread overview]
Message-ID: <b8941997-81c1-490c-8f23-62070f7a46a2@intel.com> (raw)
In-Reply-To: <cd4828de-3a60-41a1-bb5a-9212bbe01e60@intel.com>
On 2/11/2025 12:10 PM, Dave Hansen wrote:
> On 2/11/25 11:43, Sohil Mehta wrote:
>> Currently only Family 6 is considered as modern and avoids the 10 msec
>> INIT delay. The optimization doesn't extend to the upcoming Family 18/19
>> models.
>
> This doesn't quite parse correctly to me.
>
> Let's say it this way:
>
> Some old crusty CPUs need an extra delay that slows down
> booting. See the comment above 'init_udelay' for details. Newer
> CPUs don't need the delay.
>
> Right now, for Intel, Family 6 and only Family 6 skips the
> delay. That leaves out both the Family 15 (Pentium 4s) and brand
> new Family 18/19 models.
>
> The omission of Family 15 (Pentium 4s) seems like an oversight
> and 18/19 do not need the delay.
>
> Skip the delay on all Intel processors Family 6 and beyond.
>
> Is there anything wrong there?
No, it is accurate.
next prev parent reply other threads:[~2025-02-11 20:20 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-11 19:43 [PATCH v2 00/17] Prepare for new Intel Family numbers Sohil Mehta
2025-02-11 19:43 ` [PATCH v2 01/17] x86/smpboot: Remove confusing quirk usage in INIT delay Sohil Mehta
2025-02-11 19:43 ` [PATCH v2 02/17] x86/smpboot: Fix INIT delay optimization for extended Intel Families Sohil Mehta
2025-02-11 20:10 ` Dave Hansen
2025-02-11 20:20 ` Sohil Mehta [this message]
2025-02-11 19:43 ` [PATCH v2 03/17] x86/apic: Fix 32-bit APIC initialization " Sohil Mehta
2025-02-11 19:43 ` [PATCH v2 04/17] x86/cpu/intel: Fix the movsl alignment preference for extended Families Sohil Mehta
2025-02-11 20:26 ` Dave Hansen
2025-02-11 21:45 ` David Laight
2025-02-11 19:43 ` [PATCH v2 05/17] x86/cpu/intel: Fix page copy performance " Sohil Mehta
2025-02-11 20:53 ` Dave Hansen
2025-02-12 0:54 ` Andrew Cooper
2025-02-12 21:19 ` Sohil Mehta
2025-02-13 23:02 ` Andrew Cooper
2025-02-14 0:29 ` Sohil Mehta
2025-02-11 19:43 ` [PATCH v2 06/17] cpufreq: Fix the efficient idle check for Intel " Sohil Mehta
2025-02-12 5:35 ` Zhang, Rui
2025-02-13 18:49 ` Sohil Mehta
2025-02-14 2:03 ` Zhang, Rui
2025-02-11 19:43 ` [PATCH v2 07/17] hwmon: Fix Intel Family-model checks to include " Sohil Mehta
2025-02-11 20:58 ` Dave Hansen
2025-02-11 21:38 ` Sohil Mehta
2025-02-12 13:43 ` Zhang, Rui
2025-02-12 16:57 ` Dave Hansen
2025-02-14 2:23 ` Zhang, Rui
2025-02-12 13:10 ` Zhang, Rui
2025-02-11 19:43 ` [PATCH v2 08/17] x86/microcode: Update the Intel processor flag scan check Sohil Mehta
2025-02-11 21:00 ` Dave Hansen
2025-02-11 19:43 ` [PATCH v2 09/17] x86/mtrr: Modify a x86_model check to an Intel VFM check Sohil Mehta
2025-02-11 21:00 ` Dave Hansen
2025-02-11 19:44 ` [PATCH v2 10/17] x86/cpu/intel: Replace early Family 6 checks with VFM ones Sohil Mehta
2025-02-11 21:03 ` Dave Hansen
2025-02-11 19:44 ` [PATCH v2 11/17] x86/cpu/intel: Replace Family 15 " Sohil Mehta
2025-02-11 21:03 ` Dave Hansen
2025-02-11 19:44 ` [PATCH v2 12/17] x86/cpu/intel: Replace Family 5 model " Sohil Mehta
2025-02-11 21:06 ` Dave Hansen
2025-02-11 19:44 ` [PATCH v2 13/17] x86/pat: Replace Intel x86_model " Sohil Mehta
2025-02-11 21:09 ` Dave Hansen
2025-02-11 21:42 ` Sohil Mehta
2025-02-11 19:44 ` [PATCH v2 14/17] x86/acpi/cstate: Improve Intel Family model checks Sohil Mehta
2025-02-11 21:20 ` Dave Hansen
2025-02-11 19:44 ` [PATCH v2 15/17] x86/cpu/intel: Bound the non-architectural constant_tsc " Sohil Mehta
2025-02-11 21:41 ` Dave Hansen
2025-02-12 0:45 ` Sohil Mehta
2025-02-11 19:44 ` [PATCH v2 16/17] perf/x86: Simplify P6 PMU initialization Sohil Mehta
2025-02-11 19:44 ` [PATCH v2 17/17] perf/x86/p4: Replace Pentium 4 model checks with VFM ones Sohil Mehta
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