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Date: Mon, 5 May 2008 23:49:04 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Parag Warudkar <parag.warudkar@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       "akpm@osdl.org" <akpm@osdl.org>, Peter Zijlstra <peterz@infradead.org>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Arjan van de Ven <arjan@infradead.org>,
       Yinghai Lu <yhlu.kernel@gmail.com>,
       Jesse Barnes <jbarnes@virtuousgeek.org>
Subject: Re: [PATCH] default to n for GROUP_SCHED and FAIR_GROUP_SCHED
Message-ID: <20080505214904.GA8204@elte.hu>
References: <82e4877d0805031742o464dd581wd93173d79705ce0d@mail.gmail.com> <20080504092417.GA3425@elte.hu> <82e4877d0805050814j721ae522k84384df48c9f4336@mail.gmail.com> <20080505172146.GB22332@elte.hu> <82e4877d0805051436u377bf943m3beef5e9be5cbe23@mail.gmail.com>
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* Parag Warudkar <parag.warudkar@gmail.com> wrote:

> On Mon, May 5, 2008 at 1:21 PM, Ingo Molnar <mingo@elte.hu> wrote:
> 
> >  does -git boot fine - or is this a regression relative to v2.6.25?
> >
> >  I just built your config on latest sched-devel and booted it on two
> >  64-bit testboxes and it boots just fine.
> >
> >  could you send your -git bootup log?
> 
> Hmm - It's the IO_DELAY stuff - I will test more but it looks like 
> with CONFIG_IO_DELAY_TYPE_NONE -git boots fine on my machine but with 
> the same option sched-devel does not. Setting CONFIG_IO_DELAY_TYPE=0 
> (0x80) makes sched-devel boots again.

hm, that's really interesting. I've added a patch that makes 
IO_DELAY_TYPE_NONE depend on CONFIG_BROKEN, because your machine is 
reasonably new but apparently needs delays during bootup. But why 
sched-devel triggered this is still weird.

	Ingo