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Re: [PATCH] raise tsc clocksource rating

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From: Zachary Amsden <zach@...>
To: Ingo Molnar <mingo@...>
Cc: Glauber de Oliveira Costa <gcosta@...>, <linux-kernel@...>, <tglx@...>, <rusty@...>, <jeremy@...>, <--cc@...>, <avi@...>, <kvm-devel@...>, Glauber de Oliveira Costa <glauber@...>, Dan Hecht <dhecht@...>, Garrett Smith <garrett@...>
Subject: Re: [PATCH] raise tsc clocksource rating
Date: Monday, October 29, 2007 - 7:13 pm

On Tue, 2007-10-30 at 00:02 +0100, Ingo Molnar wrote:


No, if no paravirt clocksource is detected, nothing can override the
perfect TSC hardware clocksource rating of 400.  And if a paravirt
clocksource is detected, it is always better than TSC.


This patch should be nacked, since it is just wrong.  This is not an
optimization issue.  It is an accuracy issue for all virtualization
environments that affects long term kernel clock stability, which is
important to fix, and the best way to do that is to use a paravirt
clocksource.

Zach

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Messages in current thread:
[PATCH] raise tsc clocksource rating, Glauber de Oliveira Costa..., (Mon Oct 29, 7:10 pm)
Re: [PATCH] raise tsc clocksource rating, H. Peter Anvin, (Mon Oct 29, 8:17 pm)
Re: [PATCH] raise tsc clocksource rating, Zachary Amsden, (Mon Oct 29, 6:42 pm)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Mon Oct 29, 6:48 pm)
Re: [PATCH] raise tsc clocksource rating, Zachary Amsden, (Mon Oct 29, 6:55 pm)
Re: [PATCH] raise tsc clocksource rating, Glauber de Oliveira Costa..., (Tue Oct 30, 7:59 am)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Mon Oct 29, 7:02 pm)
Re: [PATCH] raise tsc clocksource rating, Dan Hecht, (Mon Oct 29, 7:24 pm)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Tue Oct 30, 3:14 am)
Re: [kvm-devel] [PATCH] raise tsc clocksource rating, Avi Kivity, (Tue Oct 30, 12:24 am)
Re: [PATCH] raise tsc clocksource rating, Zachary Amsden, (Mon Oct 29, 7:13 pm)
Re: [PATCH] raise tsc clocksource rating, Glauber de Oliveira Costa..., (Tue Oct 30, 8:02 am)
Re: [PATCH] raise tsc clocksource rating, Zachary Amsden, (Tue Oct 30, 1:58 pm)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Mon Oct 29, 7:17 pm)
Re: [PATCH] raise tsc clocksource rating, Jeremy Fitzhardinge, (Mon Oct 29, 6:52 pm)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Mon Oct 29, 6:55 pm)
Re: [PATCH] raise tsc clocksource rating, Jeremy Fitzhardinge, (Mon Oct 29, 7:17 pm)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Mon Oct 29, 7:21 pm)
Re: [PATCH] raise tsc clocksource rating, Jeremy Fitzhardinge, (Mon Oct 29, 7:33 pm)
Re: [PATCH] raise tsc clocksource rating, Jeremy Fitzhardinge, (Mon Oct 29, 6:45 pm)
Re: [PATCH] raise tsc clocksource rating, Thomas Gleixner, (Mon Oct 29, 6:17 pm)
Re: [PATCH] raise tsc clocksource rating, Rusty Russell, (Mon Oct 29, 10:39 pm)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Tue Oct 30, 3:37 am)
Re: [PATCH] raise tsc clocksource rating, Glauber de Oliveira Costa..., (Tue Oct 30, 8:13 am)
Re: [PATCH] raise tsc clocksource rating, Rusty Russell, (Tue Oct 30, 6:52 am)
Re: [PATCH] raise tsc clocksource rating, john stultz, (Mon Oct 29, 9:26 pm)
Re: [PATCH] raise tsc clocksource rating, Ingo Molnar, (Mon Oct 29, 6:36 pm)