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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 17:33:32 -0800	[thread overview]
Message-ID: <1201570413.2826.73.camel@imap.mvista.com> (raw)
In-Reply-To: <479E6F71.4040906@qualcomm.com>


On Mon, 2008-01-28 at 16:12 -0800, Max Krasnyanskiy wrote:

> Not accurate enough and way too much overhead for what I need. I know at this point it probably 
> sounds like I'm talking BS :). I wish I've released the engine and examples by now. Anyway let 
> me just say that SW MAC has crazy tight deadlines with lots of small tasks. Using nanosleep() & 
> gettimeofday() is simply not practical. So it's all TSC based with clever time sync logic between
> HW and SW.

I don't know if it's BS or not, you clearly fixed your own problem which
is good .. Although when you say "RT patches cannot achieve what I
needed. Even RTAI/Xenomai can't do that." , and HRT is "Not accurate
enough and way too much overhead" .. Given the hardware your using,
that's all difficult to believe.. You also said this code has been
running on production systems for two year, which means it's at least
two years old .. There's been some good sized leaps in real time linux
in the past two years ..

Daniel


  reply	other threads:[~2008-01-29  1:35 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
2008-01-29  0:12       ` Max Krasnyanskiy
2008-01-29  1:33         ` Daniel Walker [this message]
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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