From: Arjan van de Ven <arjan@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alok Kataria <akataria@vmware.com>,
Thomas Gleixner <tglx@linutronix.de>,
Larry Finger <Larry.Finger@lwfinger.net>,
LKML <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Michael Buesch <mb@bu3sch.de>,
Dan Hecht <dhecht@vmware.com>
Subject: Re: [PATCH] Fix TSC calibration issues
Date: Wed, 3 Sep 2008 20:16:02 -0700 [thread overview]
Message-ID: <20080903201602.2ab6c449@infradead.org> (raw)
In-Reply-To: <alpine.LFD.1.10.0809031817430.3515@nehalem.linux-foundation.org>
On Wed, 3 Sep 2008 19:56:10 -0700 (PDT)
Linus Torvalds <torvalds@linux-foundation.org> wrote:
>
>
> On Wed, 3 Sep 2008, Alok Kataria wrote:
> >
> > As Linus suggested, we should be moving the tsc_read_refs outside
> > of the loop, this gives us more accurate TSC calibration when
> > calibrating against hpet/pmtimer, since we are now calibrating over
> > a period of 250ms.
>
> Side note: I'd like to change that.
>
> 250ms is a _loong_ time. It's a really really long time. It's
> human-noticeable. A quarter of a second at boot is just too long.
yeah it's insane ;-(
(since we boot a kernel in 1 second and a full OS including the kernel
in 5)
> - do other things while calibrating.
one option for that is the fastboot patchkit in -next ;-)
but at some point, even doing things in parallel/asynchronous isn't
helping, "parallel shit is still shit" :)
--
If you want to reach me at my work email, use arjan@linux.intel.com
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2008-09-04 3:16 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-31 22:54 Regression in 2.6.27 caused by commit bfc0f59 Larry Finger
2008-09-01 11:14 ` Thomas Gleixner
2008-09-01 15:37 ` Larry Finger
2008-09-01 17:49 ` Thomas Gleixner
2008-09-01 17:44 ` Larry Finger
2008-09-01 18:31 ` Thomas Gleixner
2008-09-01 19:10 ` Linus Torvalds
2008-09-01 20:07 ` Thomas Gleixner
2008-09-01 21:30 ` Thomas Gleixner
2008-09-01 22:02 ` Linus Torvalds
2008-09-01 22:33 ` Thomas Gleixner
2008-09-01 22:56 ` Linus Torvalds
2008-09-01 23:24 ` Thomas Gleixner
2008-09-02 6:37 ` Andi Kleen
2008-09-02 12:21 ` Thomas Gleixner
2008-09-01 22:16 ` Linus Torvalds
2008-09-01 23:16 ` Thomas Gleixner
2008-09-02 3:18 ` Linus Torvalds
2008-09-02 3:35 ` Linus Torvalds
2008-09-02 4:54 ` Larry Finger
2008-09-02 9:17 ` Alan Cox
2008-09-02 12:15 ` Thomas Gleixner
2008-09-02 15:09 ` Linus Torvalds
2008-09-02 18:14 ` Thomas Gleixner
2008-09-02 18:41 ` Alok Kataria
2008-09-02 21:16 ` Thomas Gleixner
2008-09-02 18:42 ` Linus Torvalds
2008-09-02 21:13 ` Thomas Gleixner
2008-09-02 22:21 ` Linus Torvalds
2008-09-02 23:10 ` Thomas Gleixner
2008-09-03 1:49 ` Linus Torvalds
2008-09-02 22:54 ` [PATCH] Fix TSC calibration issues Thomas Gleixner
2008-09-03 2:14 ` Linus Torvalds
2008-09-03 9:11 ` Thomas Gleixner
2008-09-04 1:14 ` Alok Kataria
2008-09-04 2:56 ` Linus Torvalds
2008-09-04 3:16 ` Arjan van de Ven [this message]
2008-09-04 3:59 ` Linus Torvalds
2008-09-04 4:10 ` Arjan van de Ven
2008-09-04 4:20 ` Linus Torvalds
2008-09-04 4:27 ` Arjan van de Ven
2008-09-04 4:25 ` Willy Tarreau
2008-09-04 4:53 ` Linus Torvalds
2008-09-04 5:09 ` Willy Tarreau
2008-09-04 1:18 ` [PATCH] Change warning message in TSC calibration Alok Kataria
2008-09-03 2:51 ` [PATCH] Fix TSC calibration issues Larry Finger
2008-09-03 4:00 ` Linus Torvalds
2008-09-03 4:34 ` Larry Finger
2008-09-05 13:45 ` Regression in 2.6.27 caused by commit bfc0f59 Mark Lord
2008-09-02 17:17 ` Bill Davidsen
2008-09-01 19:36 ` Larry Finger
2008-09-01 20:09 ` Thomas Gleixner
2008-09-01 20:23 ` Larry Finger
2008-09-01 20:45 ` Thomas Gleixner
2008-09-01 18:42 ` Linus Torvalds
2008-09-01 19:08 ` Thomas Gleixner
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