linux-kernel - Re: realtime-preempt and arm

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Message-ID: <297400.29698.qm@web59212.mail.re1.yahoo.com>
Date:	Thu, 14 Dec 2006 02:26:56 -0800 (PST)
From:	tike64 <tike64@...oo.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: realtime-preempt and arm

Ingo Molnar <mingo@...e.hu> wrote:
> tike64 <tike64@...oo.com> wrote:
> > Ok, understood; I tried this:
> > 
> > 	t = raw_timer();
> > 	ts.tv_nsec = 5000000;
> > 	ts.tv_sec = 0;
> > 	nanosleep(&ts, 0);
> > 	t = raw_timer() - t;
> > 
> > It is better but I still see 8ms occasional delays when listing 
> > nfs-mounted directories onto FB. And, what is funny, also this
> > version makes the average delay 20ms as if it made the jiffy 20ms.
> 
> ARM has no high resolution timers support yet in the -rt tree.

Yes, but is there a reason why the -rt patch seems to make the 10ms
jiffy 20ms and why the jitter is so high. I don't need high resolution
but reasonable, a couple of milliseconds, jitter.

--

tike

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