linux-kernel - Re: Time drifting after multiple sleep/wakeup in timekeeping

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Message-ID: <20080626201216.GD9878@ucw.cz>
Date:	Thu, 26 Jun 2008 22:12:17 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Mayank Sharma <mayanks@...f.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Time drifting after multiple sleep/wakeup in timekeeping

On Wed 2008-06-25 17:18:52, Mayank Sharma wrote:
> Hi,
> 
> I noticed a bug with respect to time drifting after multiple sleep/wakeup sequence. We have an embedded ARM11 based platform on which we have successfuly ported Linux. We also have a RTC on board. Hence we have implemented the read_persistent_clock() function overriding the one defined in kernel/time/timekeeping.c. What we observed was that after doing multiple sleep/wakeup sequences, the time reported by RTC and gettimeofday was drifting. After about 10 iterations the gettimeofday was lagging by about one second. Subsequently the lag only increased. 
> 

Hmm, should I look forward for linux-based gps?

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