linux-kernel - Re: [PATCH] raise tsc clocksource rating

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Message-ID: <20071029232140.GA10518@elte.hu>
Date:	Tue, 30 Oct 2007 00:21:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Zachary Amsden <zach@...are.com>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	rusty@...tcorp.com.au, Avi Kivity <avi@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Glauber de Oliveira Costa <glauber@....localdomain>,
	Dan Hecht <dhecht@...are.com>,
	Garrett Smith <garrett@...are.com>
Subject: Re: [PATCH] raise tsc clocksource rating


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Ingo Molnar wrote:
> > that's totally broken then. You cannot create an SMP-safe monotonic 
> > clocksource via interpolation - native does not do it either. Good thing 
> > this problem got exposed, it needs to be fixed.
> >   
> 
> Sigh, I don't really want to have this fight again.

i dont remember us having discussed this before, ever. If there's any 
"fight" about monotonicity and SMP then it would be a pretty onesided 
affair, with you being beaten up seriously ;-)

> I don't really see what point there is in raising the tsc's rating 
> (why is 300 insufficient again?), but regardless of the value, the Xen 
> clocksource rating needs to be higher.

anyway, i agree that this patch cannot go in in its current form.

	Ingo
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