linux-kernel - Re: [PATCH] x86 uv: lower UV rtc clocksource rating

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Message-ID: <20120219125132.GC25900@elte.hu>
Date:	Sun, 19 Feb 2012 13:51:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dimitri Sivanich <sivanich@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	John Stultz <johnstul@...ibm.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Jack Steiner <steiner@....com>
Subject: Re: [PATCH] x86 uv: lower UV rtc clocksource rating

* Dimitri Sivanich <sivanich@....com> wrote:

> On Fri, Feb 17, 2012 at 01:02:42PM +0100, Ingo Molnar wrote:
> > 
> > * Dimitri Sivanich <sivanich@....com> wrote:
> > 
> > > Lower the rating of the UV rtc clocksource to just below that of the tsc.
> > 
> > This changelog is deficient for obvious reasons, mind updating 
> > it?
> >
> OK.  Is this sufficient?
> 
> 
> Lower the rating of the UV rtc clocksource to just below that of the tsc.
> 
> Reading the tsc clocksource has lower latency than reading the rtc, so favor
> it in situations where it is synchronized and stable.  When the tsc is
> unsynchronized, the rtc needs to be the chosen clocksource.

Yeah, perfect, thanks.

	Ingo
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