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Re: [PATCH] raise tsc clocksource rating

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From: Zachary Amsden <zach@...>
To: Glauber de Oliveira Costa <gcosta@...>
Cc: <linux-kernel@...>, <tglx@...>, <rusty@...>, <jeremy@...>, <--cc@...>, <mingo@...>, <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 - 6:42 pm

On Mon, 2007-10-29 at 20:10 -0300, Glauber de Oliveira Costa wrote:

Why is the TSC better than a paravirt clocksource?  In our case this is
definitely inaccurate.  Paravirt clocksources should be preferred to
TSC, and both must be made available in hardware for platforms which do
not support paravirt.

Also, please cc all the paravirt developers on things related to
paravirt, especially things with such broad effect.  I think 400 is a
good value for a perfect native clocksource.  >400 should be reserved
for super-real (i.e. paravirt) sources that should always be chosen over
a hardware realistic implementation in a virtual environment.

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)