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Date: Sat, 16 Oct 2004 15:04:50 +0200
From: Ingo Molnar <mingo@elte.hu>
To: "K.R. Foley" <kr@cybsft.com>
Cc: Rui Nuno Capela <rncbc@rncbc.org>, Lee Revell <rlrevell@joe-job.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       mark_h_johnson@raytheon.com, Daniel Walker <dwalker@mvista.com>,
       Bill Huey <bhuey@lnxw.com>, Andrew Morton <akpm@osdl.org>,
       Adam Heath <doogie@debian.org>,
       Lorenzo Allegrucci <l_allegrucci@yahoo.it>,
       Andrew Rodland <arodland@entermail.net>
Subject: Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U3
Message-ID: <20041016130450.GA8387@elte.hu>
References: <20041012195424.GA3961@elte.hu> <20041013061518.GA1083@elte.hu> <20041014002433.GA19399@elte.hu> <20041014143131.GA20258@elte.hu> <20041014234202.GA26207@elte.hu> <20041015102633.GA20132@elte.hu> <1097888438.6737.63.camel@krustophenia.net> <1097894120.31747.1.camel@krustophenia.net> <32812.192.168.1.5.1097922568.squirrel@192.168.1.5> <41711A08.7040905@cybsft.com>
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* K.R. Foley <kr@cybsft.com> wrote:

> >>It builds fine if CONFIG_SMP is set.  Am I really the only person
> >>running this on UP?
> >
> >I run both, on different machines.
> >
> >I'm actually running 2.6.9-rc4-mm1-U3 at this very moment, on my laptop
> >(P4 2.53Ghz/UP, Mdk 10.1c) and also on my desktop machine (P4
> >2.80Ghz/SMP/HT, SuSE 9.1).
> >
> >However, on the desktop (SMP/HT) I could only made it boot/init
> >successfully with CONFIG_PREEMPT_REALTIME off. On my laptop (UP) is
> >running pretty well on full RT.
> 
> I'm curious what you get when you try to boot the SMP system with
> REALTIME on? My SMP/HT system at the office works fine with this. 
> Although there is one difference that jumps out at me. I have disabled
> ACPI. I don't have the config handy so I can't do a complete
> comparison, just going from memory.

one group of complaints seems to be related to SELINUX=y: it has hooks
all across the kernel deep within the locking hierarchy - and then
itself it does pretty complex stuff too. IPC is certainly broken due to
this, but some networking problems seem to be related too.

	Ingo