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From: Thomas Gleixner <tglx@kernel.org>
To: Petr Mladek <pmladek@suse.com>, "Bird, Tim" <Tim.Bird@sony.com>
Cc: Michael Kelley <mhklinux@outlook.com>, "rostedt@goodmis.org"
 <rostedt@goodmis.org>, "senozhatsky@chromium.org"
 <senozhatsky@chromium.org>, "francesco@valla.it" <francesco@valla.it>,
 "geert@linux-m68k.org" <geert@linux-m68k.org>,
 "linux-embedded@vger.kernel.org" <linux-embedded@vger.kernel.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, John Stultz
 <jstultz@google.com>, Stephen Boyd <sboyd@kernel.org>, John Ogness
 <john.ogness@linutronix.de>
Subject: Re: [PATCH v3] printk: fix zero-valued printk timestamps in early boot
In-Reply-To: <abPqrqgXHnDu8XWf@pathway>
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 <20260210234741.3262320-1-tim.bird@sony.com>
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Date: Sat, 28 Mar 2026 16:56:04 +0100
Message-ID: <87mrzsaqy3.ffs@tglx>
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On Fri, Mar 13 2026 at 11:45, Petr Mladek wrote:
> [    9.296302] cpuidle: using governor menu
>
> Here the thermal governors are registered. I guess that they might
> reduce speed of some HW.

No. The frequency of the TSC and KVM clock are stable. For TSC that's
only true for CPUs which have X86_FEATURE_CONSTANT_TSC set, which is the
case for every x86 CPU shipped in the last 20 years.

Thanks,

        tglx