From: "H. Peter Anvin" <hpa@zytor.com>
To: Glauber de Oliveira Costa <gcosta@redhat.com>
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
rusty@rustcorp.com.au, jeremy@goop.org, --cc@redhat.com,
mingo@elte.hu, avi@quramnet.com, kvm-devel@lists.sourceforge.net,
Glauber de Oliveira Costa <glauber@t60.localdomain>
Subject: Re: [PATCH] raise tsc clocksource rating
Date: Mon, 29 Oct 2007 17:17:54 -0700 [thread overview]
Message-ID: <47267832.1060003@zytor.com> (raw)
In-Reply-To: <11936994092607-git-send-email-gcosta@redhat.com>
Glauber de Oliveira Costa wrote:
> From: Glauber de Oliveira Costa <glauber@t60.localdomain>
>
> tsc is very good time source (when it does not have drifts, does not
> change it's frequency, i.e. when it works), so it should have its rating
> raised to a value greater than, or equal 400.
>
> Since it's being a tendency among paravirt clocksources to use values
> around 400, we should declare tsc as even better: So we use 500.
>
> This patch also touches the comments on clocksource.h, which suggests
> that 499 would be a limit on the rating values.
>
> Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Are you sure these paravirt sources don't intentionally trump the TSC?
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Glauber de Oliveira Costa
<gcosta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: jeremy-TSDbQ3PG+2Y@public.gmane.org,
avi-i/T1Zxg06OZWk0Htik3J/w@public.gmane.org,
kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Glauber de Oliveira Costa
<glauber-aMxvdZfKFXomYvmMESoHnA@public.gmane.org>,
--cc-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: Re: [PATCH] raise tsc clocksource rating
Date: Mon, 29 Oct 2007 17:17:54 -0700 [thread overview]
Message-ID: <47267832.1060003@zytor.com> (raw)
In-Reply-To: <11936994092607-git-send-email-gcosta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Glauber de Oliveira Costa wrote:
> From: Glauber de Oliveira Costa <glauber-aMxvdZfKFXomYvmMESoHnA@public.gmane.org>
>
> tsc is very good time source (when it does not have drifts, does not
> change it's frequency, i.e. when it works), so it should have its rating
> raised to a value greater than, or equal 400.
>
> Since it's being a tendency among paravirt clocksources to use values
> around 400, we should declare tsc as even better: So we use 500.
>
> This patch also touches the comments on clocksource.h, which suggests
> that 499 would be a limit on the rating values.
>
> Signed-off-by: Glauber de Oliveira Costa <gcosta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Are you sure these paravirt sources don't intentionally trump the TSC?
-hpa
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next prev parent reply other threads:[~2007-10-30 0:18 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-29 23:10 [PATCH] raise tsc clocksource rating Glauber de Oliveira Costa
2007-10-29 23:10 ` Glauber de Oliveira Costa
2007-10-29 22:17 ` Thomas Gleixner
2007-10-29 22:17 ` Thomas Gleixner
2007-10-29 22:36 ` Ingo Molnar
2007-10-30 1:26 ` john stultz
2007-10-30 2:39 ` Rusty Russell
2007-10-30 2:39 ` Rusty Russell
2007-10-30 7:37 ` Ingo Molnar
2007-10-30 7:37 ` Ingo Molnar
2007-10-30 10:52 ` Rusty Russell
2007-10-30 10:52 ` Rusty Russell
2007-10-30 12:13 ` Glauber de Oliveira Costa
2007-10-30 12:13 ` Glauber de Oliveira Costa
2007-10-29 22:42 ` Zachary Amsden
2007-10-29 22:42 ` Zachary Amsden
2007-10-29 22:45 ` Jeremy Fitzhardinge
2007-10-29 22:45 ` Jeremy Fitzhardinge
2007-10-29 22:48 ` Ingo Molnar
2007-10-29 22:52 ` Jeremy Fitzhardinge
2007-10-29 22:52 ` Jeremy Fitzhardinge
2007-10-29 22:55 ` Ingo Molnar
2007-10-29 23:17 ` Jeremy Fitzhardinge
2007-10-29 23:17 ` Jeremy Fitzhardinge
2007-10-29 23:21 ` Ingo Molnar
2007-10-29 23:21 ` Ingo Molnar
2007-10-29 23:33 ` Jeremy Fitzhardinge
2007-10-29 23:33 ` Jeremy Fitzhardinge
2007-10-30 0:45 ` Ian Pratt
2007-10-30 0:45 ` Ian Pratt
2007-10-30 7:19 ` Ingo Molnar
2007-10-30 7:19 ` Ingo Molnar
2007-10-29 22:55 ` Zachary Amsden
2007-10-29 22:55 ` Zachary Amsden
2007-10-29 23:02 ` Ingo Molnar
2007-10-29 23:13 ` Zachary Amsden
2007-10-29 23:17 ` Ingo Molnar
2007-10-29 23:17 ` Ingo Molnar
2007-10-30 12:02 ` Glauber de Oliveira Costa
2007-10-30 12:02 ` Glauber de Oliveira Costa
2007-10-30 17:58 ` Zachary Amsden
2007-10-30 17:58 ` Zachary Amsden
2007-10-29 23:24 ` Dan Hecht
2007-10-29 23:24 ` Dan Hecht
2007-10-30 4:24 ` [kvm-devel] " Avi Kivity
2007-10-30 4:24 ` Avi Kivity
2007-10-30 7:14 ` Ingo Molnar
2007-10-30 7:14 ` Ingo Molnar
2007-10-30 11:59 ` Glauber de Oliveira Costa
2007-10-30 11:59 ` Glauber de Oliveira Costa
2007-10-30 0:17 ` H. Peter Anvin [this message]
2007-10-30 0:17 ` H. Peter Anvin
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