From: Ingo Molnar <mingo@elte.hu>
To: Dimitri Sivanich <sivanich@sgi.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
John Stultz <johnstul@us.ibm.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Jack Steiner <steiner@sgi.com>
Subject: Re: [PATCH] x86 uv: lower UV rtc clocksource rating
Date: Sun, 19 Feb 2012 13:51:32 +0100 [thread overview]
Message-ID: <20120219125132.GC25900@elte.hu> (raw)
In-Reply-To: <20120217141641.GA28063@sgi.com>
* Dimitri Sivanich <sivanich@sgi.com> wrote:
> On Fri, Feb 17, 2012 at 01:02:42PM +0100, Ingo Molnar wrote:
> >
> > * Dimitri Sivanich <sivanich@sgi.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
next prev parent reply other threads:[~2012-02-19 12:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-16 20:10 [PATCH] x86 uv: lower UV rtc clocksource rating Dimitri Sivanich
2012-02-17 12:02 ` Ingo Molnar
2012-02-17 14:16 ` Dimitri Sivanich
2012-02-19 12:51 ` Ingo Molnar [this message]
2012-02-20 11:46 ` [tip:x86/uv] x86/UV: Lower " tip-bot for Dimitri Sivanich
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