From: Eugene Surovegin <ebs@ebshome.net>
To: Rune Torgersen <runet@innovsys.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Wall clock accuracy
Date: Tue, 9 Aug 2005 10:20:53 -0700 [thread overview]
Message-ID: <20050809172053.GA29942@gate.ebshome.net> (raw)
In-Reply-To: <DCEAAC0833DD314AB0B58112AD99B93B859418@ismail.innsys.innovsys.com>
On Tue, Aug 09, 2005 at 12:04:10PM -0500, Rune Torgersen wrote:
>
> My bigger problem with the walltime is that time_nsec should have been
> 1000000, not 999848 to begin with. If it had been, I would probably
> never even have noticed it.
>
> The thing is that that value is set based on a value I cannot find any
> reference as how was chosen. Looks to be a leftover when porting PPC
> fron i386 once upon a time.
>
> time_nsec basically gets is value (via some macros) from
> CLOCK_TICK_RATE, which is defined in asm-ppc/timex.h to be 1193180
>
> In my opinion, time_nsec should have been calculated based on the actual
> clock input rate to begin with (like in calibrate_decrementer()).
Fair enough, why then instead of fixing the root cause you are making
ugly workarounds :) ?
--
Eugene
next prev parent reply other threads:[~2005-08-09 17:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-09 17:04 Wall clock accuracy Rune Torgersen
2005-08-09 17:20 ` Eugene Surovegin [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-08-09 19:11 Rune Torgersen
2005-08-09 18:52 Rune Torgersen
2005-08-09 18:56 ` Eugene Surovegin
2005-08-09 18:21 Rune Torgersen
2005-08-09 18:34 ` Eugene Surovegin
2005-08-09 16:57 Rune Torgersen
2005-08-09 16:59 ` Eugene Surovegin
2005-08-09 17:02 ` Eugene Surovegin
2005-08-09 15:23 Rune Torgersen
2005-08-09 16:41 ` Eugene Surovegin
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