From: Xavier Bestel <xavier.bestel@free.fr>
To: Sven-Thorsten Dietrich <sven@mvista.com>
Cc: thockin@hockin.org, Lee Revell <rlrevell@joe-job.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Dual core Athlons and unsynced TSCs
Date: Fri, 13 Jan 2006 20:13:57 +0100 [thread overview]
Message-ID: <1137179637.9366.1.camel@bip.parateam.prv> (raw)
In-Reply-To: <1137178574.2536.13.camel@localhost.localdomain>
Le vendredi 13 janvier 2006 à 10:56 -0800, Sven-Thorsten Dietrich a
écrit :
> On Fri, 2006-01-13 at 10:55 -0800, thockin@hockin.org wrote:
> > On Fri, Jan 13, 2006 at 01:09:51PM -0500, Lee Revell wrote:
> > > > Some apps/users need higher resolution and lower overhead that only rdtsc
> > > > can offer currently.
> > >
> > > But obviously if the TSC gives wildly inaccurate results, it cannot be
> > > used no matter how low the overhead.
> >
> > unless we can re-sync the TSCs often enough that apps don't notice.
> >
>
> You'd have to quantify that somehow, in terms of the max drift rate
> (ppm), and the max resolution available (< tsc frequency).
>
> Either that, or track an offset, and use one TSC as truth, and update
> the correction factor for the other TSCs as often as needed, maybe?
As often as needed being each time a thread changes CPU ?
next prev parent reply other threads:[~2006-01-13 19:13 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-12 22:17 Lee Revell
2006-01-13 15:10 ` Roger Heflin
2006-01-13 16:04 ` Steven Rostedt
2006-01-13 17:47 ` Lee Revell
2006-01-13 17:52 ` Steven Rostedt
2006-01-13 17:54 ` Lee Revell
2006-01-13 18:41 ` Steven Rostedt
2006-01-13 18:55 ` Lee Revell
2006-01-13 20:09 ` Steven Rostedt
2006-01-13 20:26 ` Steven Rostedt
2006-01-13 20:40 ` Lee Revell
2006-01-13 20:43 ` Lee Revell
2006-01-13 20:46 ` Thomas Gleixner
2006-01-13 20:48 ` Lee Revell
2006-01-13 20:51 ` Thomas Gleixner
2006-01-13 20:52 ` Steven Rostedt
2006-01-13 21:05 ` Steven Rostedt
2006-01-13 21:10 ` Thomas Gleixner
2006-01-13 21:17 ` Steven Rostedt
2006-01-16 9:52 ` Thomas Gleixner
2006-01-16 15:55 ` Steven Rostedt
2006-01-14 0:23 ` john stultz
2006-01-14 1:10 ` Steven Rostedt
2006-01-14 1:14 ` Lee Revell
2006-01-14 1:23 ` john stultz
2006-01-14 1:27 ` Lee Revell
2006-01-14 1:39 ` john stultz
2006-01-14 1:43 ` Steven Rostedt
2006-01-14 1:50 ` john stultz
2006-01-14 2:15 ` Steven Rostedt
2006-01-14 2:34 ` Steven Rostedt
2006-01-16 1:19 ` Andi Kleen
2006-01-14 6:54 ` Christoph Lameter
2006-01-13 18:06 ` thockin
2006-01-13 17:58 ` Lee Revell
2006-01-13 18:16 ` thockin
2006-01-13 18:09 ` Lee Revell
2006-01-13 18:55 ` thockin
2006-01-13 18:56 ` Sven-Thorsten Dietrich
2006-01-13 19:00 ` Lee Revell
2006-01-13 19:07 ` Sven-Thorsten Dietrich
2006-01-13 21:18 ` David Lang
2006-01-13 21:56 ` thockin
2006-01-13 22:05 ` David Lang
2006-01-13 22:18 ` Sven-Thorsten Dietrich
2006-01-13 22:49 ` David Lang
2006-01-14 0:41 ` Andreas Steinmetz
2006-01-14 1:04 ` David Lang
2006-01-14 1:21 ` Andreas Steinmetz
2006-01-14 1:51 ` thockin
2006-01-15 8:52 ` Zan Lynx
2006-01-15 16:25 ` thockin
2006-01-15 16:33 ` Lee Revell
2006-01-15 18:21 ` thockin
2006-01-15 18:29 ` Lee Revell
2006-01-15 18:49 ` thockin
2006-01-14 1:13 ` thockin
2006-01-13 22:23 ` thockin
2006-01-13 19:13 ` Xavier Bestel [this message]
2006-01-13 19:32 ` thockin
2006-01-13 20:58 ` Steven Rostedt
[not found] <5ujmj-1UQ-511@gated-at.bofh.it>
[not found] ` <5uBnF-2SG-11@gated-at.bofh.it>
[not found] ` <5uBnF-2SG-9@gated-at.bofh.it>
[not found] ` <5uBxi-3iM-21@gated-at.bofh.it>
[not found] ` <5uBGY-3ul-21@gated-at.bofh.it>
[not found] ` <5uCa5-443-45@gated-at.bofh.it>
[not found] ` <5uCjF-4fW-15@gated-at.bofh.it>
[not found] ` <5uCtj-4Fi-15@gated-at.bofh.it>
2006-01-14 0:24 ` Robert Hancock
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