linux-kernel - Re: printk timestamps jumping back and forth in 2.6.25-rc.

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Message-Id: <20080229.104235.192308716.davem@davemloft.net>
Date:	Fri, 29 Feb 2008 10:42:35 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	paulus@...ba.org
Cc:	mingo@...e.hu, alexey.zaytsev@...il.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: printk timestamps jumping back and forth in 2.6.25-rc.

From: Paul Mackerras <paulus@...ba.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.
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