linux-kernel - Re: [patch] x86, tsc: skip TSC synchronization checks for tsc=reliable

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Message-ID: <1320689161.5809.1.camel@work-vm>
Date:	Mon, 07 Nov 2011 10:06:01 -0800
From:	john stultz <johnstul@...ibm.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch] x86, tsc: skip TSC synchronization checks for
 tsc=reliable

On Fri, 2011-11-04 at 15:42 -0700, Suresh Siddha wrote:
> tsc=reliable boot parameter is supposed to skip all the TSC stablility
> checks during boot time.
> 
> On a 8-socket system where we want to run an experiment with the
> "tsc=reliable" boot option, TSC synchronization checks are not
> getting skipped and marking the TSC as not stable.
> 
> Check for tsc_clocksource_reliable (which is set via tsc=reliable or
> for platforms supporting synthetic TSC_RELIABLE feature bit etc)
> and when set, skip the TSC synchronization tests during boot.
> 
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>

Looks like a nice cleanup of the tsc=reliable semantics.

Acked-by: John Stultz <johnstul@...ibm.com>

thanks
-john


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