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From: Daniel Walker <dwalker@mvista.com>
To: Max Krasnyanskiy <maxk@qualcomm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	Steven Rostedt <srostedt@redhat.com>,
	Gregory Haskins <ghaskins@novell.com>, Paul Jackson <pj@sgi.com>
Subject: Re: [CPUISOL] CPU isolation extensions
Date: Mon, 28 Jan 2008 15:41:45 -0800	[thread overview]
Message-ID: <1201563706.2826.34.camel@imap.mvista.com> (raw)
In-Reply-To: <479E1FD4.5040606@qualcomm.com>


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


  parent reply	other threads:[~2008-01-28 23:43 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-28  4:09 maxk
2008-01-28  4:09 ` [PATCH] [CPUISOL] Add config options for CPU isolation maxk
2008-01-28  4:09   ` [PATCH] [CPUISOL] Export CPU isolation bits maxk
2008-01-28  4:09     ` [PATCH] [CPUISOL] Do not route IRQs to the CPUs isolated at boot maxk
2008-01-28  4:09       ` [PATCH] [CPUISOL] Support for workqueue isolation maxk
2008-01-28  4:09         ` [PATCH] [CPUISOL] Isolated CPUs should be ignored by the "stop machine" maxk
2008-01-28  9:08 ` [CPUISOL] CPU isolation extensions Peter Zijlstra
2008-01-28 14:59   ` Paul Jackson
2008-01-28 16:34     ` Steven Rostedt
2008-01-28 16:44       ` Peter Zijlstra
2008-01-28 18:54         ` Max Krasnyanskiy
2008-01-28 18:46       ` Max Krasnyanskiy
2008-01-28 19:00         ` Steven Rostedt
2008-01-28 20:22           ` Peter Zijlstra
2008-01-28 21:42             ` Max Krasnyanskiy
2008-02-05  0:32             ` CPU isolation and workqueues [was Re: [CPUISOL] CPU isolation extensions] Max Krasnyanskiy
2008-01-28 18:37     ` [CPUISOL] CPU isolation extensions Max Krasnyanskiy
2008-01-28 19:06       ` Paul Jackson
2008-01-28 21:47         ` Max Krasnyanskiy
2008-01-31 19:06         ` Integrating cpusets and cpu isolation [was Re: [CPUISOL] CPU isolation extensions] Max Krasnyanskiy
2008-02-02  6:16           ` Paul Jackson
2008-02-03  5:57             ` Max Krasnyansky
2008-02-03  7:53               ` Paul Jackson
2008-02-04  6:03                 ` Max Krasnyansky
2008-02-04 10:54                   ` Paul Jackson
2008-02-04 23:19                     ` Max Krasnyanskiy
2008-02-05  2:46                       ` Paul Jackson
2008-02-05  4:08                         ` Max Krasnyansky
2008-01-28 18:32   ` [CPUISOL] CPU isolation extensions Max Krasnyanskiy
2008-01-28 19:10     ` Paul Jackson
2008-01-28 23:41     ` Daniel Walker [this message]
2008-01-29  0:12       ` Max Krasnyanskiy
2008-01-29  1:33         ` Daniel Walker
2008-02-04  6:53           ` Max Krasnyansky
2008-01-31 12:16 ` Mark Hounschell
2008-01-31 19:13   ` Max Krasnyanskiy

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