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From: David Miller <davem@davemloft.net>
To: a.p.zijlstra@chello.nl
Cc: efault@gmx.de, elendil@planet.nl, parag.warudkar@gmail.com,
	mingo@elte.hu, linux-kernel@vger.kernel.org, guichaz@yahoo.fr,
	andi@firstfloor.org
Subject: Re: 'global' rq->clock
Date: Fri, 02 May 2008 14:48:27 -0700 (PDT)	[thread overview]
Message-ID: <20080502.144827.158329188.davem@davemloft.net> (raw)
In-Reply-To: <1209758186.6929.18.camel@lappy>

From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 02 May 2008 21:56:26 +0200

> Ok, the the below would need something that relates tick_timestamp's to
> one another.. probably sucks without it..
> 
> OTOH, Andi said he was working on a fastish global sched_clock() thingy,
> Andi got a link to that code?

While I'm fine with this kind of stuff being added to constantly cope
with x86's joke of a TSC register implementation, it's starting to
become an enormous burdon for platforms where the TICK source actually
works properly.

Heck, on my Niagara2 chips, all 64 cpus use the same physical register
for the TICK source, it physically can't get desynchronized :-)

So, a way to turn all of this muck off would be much appreciated.
I'm happy to test anything on sparc64, and I'm sure the powerpc
folks are as well.

And I also heard a rumor that Peter has access to a machine with a
stable tick source for testing :-)

  parent reply	other threads:[~2008-05-02 21:48 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-02  0:14 Horrendous Audio Stutter - current git Parag Warudkar
2008-05-02  8:34 ` Peter Zijlstra
2008-05-02 10:32   ` Frans Pop
2008-05-02 10:35     ` Peter Zijlstra
2008-05-02 11:08       ` Peter Zijlstra
2008-05-02 11:37         ` Frans Pop
2008-05-02 11:39           ` Peter Zijlstra
2008-05-02 11:45             ` Frans Pop
2008-05-02 11:51               ` Peter Zijlstra
2008-05-02 12:06             ` Frans Pop
2008-05-02 12:22               ` Parag Warudkar
2008-05-02 13:21                 ` Dhaval Giani
2008-05-02 11:10   ` Parag Warudkar
2008-05-02 12:09     ` Mike Galbraith
2008-05-02 12:21       ` Parag Warudkar
2008-05-02 12:37         ` Mike Galbraith
2008-05-02 15:02           ` Mike Galbraith
2008-05-02 15:49             ` Frans Pop
2008-05-02 18:53               ` Frans Pop
2008-05-02 19:27                 ` Mike Galbraith
2008-05-02 19:56                   ` 'global' rq->clock (was Re: Horrendous Audio Stutter - current git) Peter Zijlstra
2008-05-02 20:38                     ` Guillaume Chazarain
2008-05-02 20:46                       ` Peter Zijlstra
2008-05-02 22:00                         ` 'global' rq->clock David Miller
2008-05-02 21:48                     ` David Miller [this message]
2008-05-02 10:09                       ` Arjan van de Ven
2008-05-04 12:12                         ` Peter Zijlstra
2008-05-02 22:07                       ` Peter Zijlstra
2008-05-03  8:28                         ` Ingo Molnar
2008-05-03  9:05                           ` David Miller
2008-05-03 10:10                             ` Ingo Molnar
2008-05-03 19:27                               ` David Miller
2008-05-03 19:37                                 ` Ingo Molnar
2008-05-03 22:30                                 ` Benjamin Herrenschmidt
2008-05-03 22:38                                   ` Ingo Molnar
2008-05-03 23:04                                     ` David Miller
2008-05-03 23:36                                       ` David Miller
2008-05-03 23:38                                         ` Ingo Molnar
2008-05-03 23:40                                           ` David Miller
2008-05-03 23:47                                             ` Ingo Molnar
2008-05-04  2:22                                     ` Benjamin Herrenschmidt
2008-05-03 19:28                               ` David Miller
2008-05-03 19:39                                 ` Ingo Molnar
2008-05-03  6:20                     ` 'global' rq->clock (was Re: Horrendous Audio Stutter - current git) Mike Galbraith
2008-05-02 19:38               ` Horrendous Audio Stutter - current git Mike Galbraith
2008-05-03  7:13           ` Frans Pop
2008-05-03  7:39             ` Mike Galbraith
2008-05-07  8:26   ` Frans Pop
2008-05-07  8:32     ` Ingo Molnar

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