From: lsorense@csclub.uwaterloo.ca (Lennart Sorensen)
To: Rodolfo Giometti <giometti@enneenne.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: LinuxPPS low-level IRQs timestamps & ldisc
Date: Mon, 2 Jun 2008 13:09:16 -0400 [thread overview]
Message-ID: <20080602170916.GD16164@csclub.uwaterloo.ca> (raw)
In-Reply-To: <20080602145603.GG26854@enneenne.com>
On Mon, Jun 02, 2008 at 04:56:03PM +0200, Rodolfo Giometti wrote:
> I prefere avoid the if clause for getnstimeofday() since each
> instruction delay may decrease time precision, so:
Not if the delay is always constant. That you can adjust for. You
already have to adjust for cable length and such for your GPS, so
adjusting for a fixed delay for a conditional is no big deal.
Of course if you have to check of the DCD changed, that may not be
constant. A check for whether this device currently has anyone that
wants the timestamp though should be a constant time.
--
Len Sorensen
next prev parent reply other threads:[~2008-06-02 17:09 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-01 16:15 Rodolfo Giometti
2008-06-01 19:26 ` Lennart Sorensen
2008-06-02 6:51 ` Alan Cox
2008-06-02 9:25 ` Rodolfo Giometti
2008-06-02 14:02 ` Alan Cox
2008-06-02 14:56 ` Rodolfo Giometti
2008-06-02 15:48 ` Alan Cox
2008-06-02 17:22 ` Rodolfo Giometti
2008-06-02 19:35 ` Alan Cox
2008-06-02 20:21 ` Matti Aarnio
2008-06-03 13:40 ` Alan Cox
2008-06-02 17:09 ` Lennart Sorensen [this message]
2008-06-02 16:59 ` Alan Cox
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