Message-ID: <421F5B5F.7040503@nortel.com>
Date: Fri, 25 Feb 2005 11:07:43 -0600
From: Chris Friesen <cfriesen@nortel.com>
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To: Lee Revell <rlrevell@joe-job.com>
CC: Paulo Marques <pmarques@grupopie.com>, Ingo Oeser <ioe-lkml@axxeo.de>,
       "Chad N. Tindel" <chad@tindel.net>, Mike Galbraith <EFAULT@gmx.de>,
       akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: Xterm Hangs - Possible scheduler defect?
References: <20050224075756.GA18639@calma.pair.com>	 <200502250151.41793.ioe-lkml@axxeo.de> <421F4042.3020302@nortel.com>	 <200502251639.50238.ioe-lkml@axxeo.de>  <421F49E0.9090806@grupopie.com> <1109348667.9681.10.camel@krustophenia.net>
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Lee Revell wrote:

> The solution to your problem (which is as old as the hills) involves
> priority inheriting mutexes which are available in the RT preempt patch
> (if you build with CONFIG_PREEMPT_RT).  This should be usable for hard
> realtime applications.

Yup.  I was just pointing out that userspace apps *can* block other 
userspace apps.

> http://people.redhat.com/mingo/realtime-preempt
> 
> If you just need very good soft realtime performance I recommend
> PREEMPT_DESKTOP.

How does this compare with Inaky's "robust mutexes" patch?

Chris

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