Date: Tue, 16 Nov 2004 22:33:12 +0100
From: Florian Schmidt <mista.tapas@gmx.net>
To: Ingo Molnar <mingo@elte.hu>
Cc: "K.R. Foley" <kr@cybsft.com>, Mark_H_Johnson@raytheon.com,
       linux-kernel@vger.kernel.org, Lee Revell <rlrevell@joe-job.com>,
       Rui Nuno Capela <rncbc@rncbc.org>, Bill Huey <bhuey@lnxw.com>,
       Adam Heath <doogie@debian.org>, Thomas Gleixner <tglx@linutronix.de>,
       Michal Schmidt <xschmi00@stud.feec.vutbr.cz>,
       Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
       Karsten Wiese <annabellesgarden@yahoo.de>,
       Gunther Persoons <gunther_persoons@spymac.com>, emann@mrv.com,
       Shane Shrybman <shrybman@aei.ca>, Amit Shah <amit.shah@codito.com>,
       Stefan Schweizer <sschweizer@gmail.com>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-3
Message-ID: <20041116223312.4e289e62@mango.fruits.de>
In-Reply-To: <20041116223135.GA27250@elte.hu>
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	<20041116184315.GA5492@elte.hu>
	<419A5A53.6050100@cybsft.com>
	<20041116212401.GA16845@elte.hu>
	<20041116222039.662f41ac@mango.fruits.de>
	<20041116223135.GA27250@elte.hu>
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On Tue, 16 Nov 2004 23:31:35 +0100
Ingo Molnar <mingo@elte.hu> wrote:

> and i'd suggest to chrt irq 1 back to below prio 90, maybe this explains
> the console-switching latency? If you do a console-switch via the
> keyboard then its priority 99 can get inherited by events/0 which then
> does the quite expensive VGA console clearing/copying with priority 99,
> possibly delaying rtc_wakeup quite significantly, easily for a
> millisecond or so. So what you are seeing might be priority inheritance
> handling at work!
> 

ah, will try this right away..

flo
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