linux-kernel - Re: Serial port blues

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Message-ID: <20070121185534.GE27422@thunk.org>
Date:	Sun, 21 Jan 2007 13:55:35 -0500
From:	Theodore Tso <tytso@....edu>
To:	Willy Tarreau <w@....eu>
Cc:	Joe Barr <joe@...rimer.com>,
	Linux Kernel mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Serial port blues

On Sun, Jan 21, 2007 at 08:05:57AM +0100, Willy Tarreau wrote:
> Hmmm the busy loop is dirty as hell, even on SMP, but it works ;-)
> I remember is was possible to reprogram the RTC to interrupt at 8192 Hz.
> If the task is running with real time prio, it should get this accuracy,
> or am I mistaken ?

You can do in a kernel module.  The problem with a userspace program
is that without the -rt patches, you can't guarantee that userspace
process will get a chance to run in time.

						- Ted
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