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From: Ingo Molnar <mingo@elte.hu>
To: David Miller <davem@davemloft.net>
Cc: paulus@samba.org, alexey.zaytsev@gmail.com, tglx@linutronix.de,
	linux-kernel@vger.kernel.org
Subject: Re: printk timestamps jumping back and forth in 2.6.25-rc.
Date: Fri, 29 Feb 2008 20:44:57 +0100	[thread overview]
Message-ID: <20080229194457.GB21249@elte.hu> (raw)
In-Reply-To: <20080229.104235.192308716.davem@davemloft.net>


* David Miller <davem@davemloft.net> wrote:

> From: Paul Mackerras <paulus@samba.org>
> Date: Fri, 29 Feb 2008 22:11:26 +1100
> 
> > On powerpc we use the timebase register, which is synchronized across
> > CPUs, so if this will add unnecessary overhead, we will want to way to
> > turn it off on powerpc (assuming this ends up going upstream).
> 
> Similarly on sparc64, all of our TSCs are fully synchronized so this 
> complexity is completely unnecessary.

i suspect for them the easiest way is to expose time_sync_thresh and let 
them set it to ULONG_MAX - which skips all synchronization overhead and 
complexity.

	Ingo

  reply	other threads:[~2008-02-29 19:45 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-28 14:26 Alexey Zaytsev
2008-02-28 19:21 ` David Miller
2008-02-28 20:13 ` Ingo Molnar
2008-02-28 20:16   ` Ingo Molnar
2008-02-28 21:24     ` Alexey Zaytsev
2008-02-29 19:45       ` Ingo Molnar
2008-03-01  0:42         ` Alexey Zaytsev
2008-03-01  0:59           ` Alexey Zaytsev
2008-03-03 10:45             ` Ingo Molnar
2008-03-03 22:16               ` Alexey Zaytsev
2008-03-04 12:44                 ` Ingo Molnar
2008-02-29 11:11     ` Paul Mackerras
2008-02-29 18:42       ` David Miller
2008-02-29 19:44         ` Ingo Molnar [this message]
2008-03-21 18:55     ` Alexey Zaytsev

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