linux-kernel - Re: [CPUISOL] CPU isolation extensions

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Message-Id: <1201563706.2826.34.camel@imap.mvista.com>
Date:	Mon, 28 Jan 2008 15:41:45 -0800
From:	Daniel Walker <dwalker@...sta.com>
To:	Max Krasnyanskiy <maxk@...lcomm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <srostedt@...hat.com>,
	Gregory Haskins <ghaskins@...ell.com>,
	Paul Jackson <pj@....com>
Subject: Re: [CPUISOL] CPU isolation extensions


On Mon, 2008-01-28 at 10:32 -0800, Max Krasnyanskiy wrote:
> Just this patches. RT patches cannot achieve what I needed. Even RTAI/Xenomai can't do that.
> For example I have separate tasks with hard deadlines that must be enforced in 50usec kind 
> of range and basically no idle time whatsoever. Just to give more background it's a wireless
> basestation with SW MAC/Scheduler. Another requirement is for the SW to know precise timing
> because SW. For example there is no way we can do predictable 1-2 usec sleeps. 
> So I wrote a user-space engine that does all this, it requires full control of the CPU ie minimal
> overhead from the kernel, just IPIs for memory management and that's basically it. When my legal 
> department lets me I'll do a presentation on this stuff at Linux RT conference or something. 

What kind of hardware are you doing this on? Also I should note there is
HRT (High resolution timers) which provided microsecond level
granularity ..

Daniel

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