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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/