linux-kernel - Re: [PATCH] smpboot: reuse timer calibration

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Message-ID: <20191029143547.GO4114@hirez.programming.kicks-ass.net>
Date:   Tue, 29 Oct 2019 15:35:47 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Arjan van de Ven <arjan@...ux.intel.com>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] smpboot: reuse timer calibration

On Tue, Oct 29, 2019 at 03:19:57PM +0100, Paul Menzel wrote:
> From: Arjan van de Ven <arjan@...ux.intel.com>
> Date: Wed, 11 Feb 2015 17:28:14 -0600
> 
> NO point recalibrating for known-constant tsc ...
> saves 200ms+ of boot time.
> 
> Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
> ---
> 
> Arjan, can your Signed-off-by line be added? On what device, did you test
> this?

This patch makes no sense what so ever given the current function, also
it hard codes 0 as being the BSP.

All of this for platforms (!constant_tsc) that barely exist anymore.