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Message-ID: <6101e8c40804190735g17f1e0bj25c2bc0e2a6eac26@mail.gmail.com>
Date: Sat, 19 Apr 2008 16:35:31 +0200
From: "Oliver Pinter" <oliver.pntr@gmail.com>
To: "Ingo Molnar" <mingo@elte.hu>
Subject: Re: x86: 4kstacks default
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
       "Arjan van de Ven" <arjan@infradead.org>,
       "Thomas Gleixner" <tglx@linutronix.de>,
       "Christoph Hellwig" <hch@infradead.org>, "David Chinner" <dgc@sgi.com>,
       xfs@oss.sgi.com
In-Reply-To: <20080419142329.GA5339@elte.hu>
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References: <200804181737.m3IHbabI010051@hera.kernel.org>
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	 <20080419142329.GA5339@elte.hu>
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Hi Ingo!

with the older kernel is typical: xfs+nfs+4k stack(+lvm)



On 4/19/08, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Andrew Morton <akpm@linux-foundation.org> wrote:
>
> > >  config 4KSTACKS
> > >  	bool "Use 4Kb for kernel stacks instead of 8Kb"
> > > -	depends on DEBUG_KERNEL
> > >  	depends on X86_32
> > > +	default y
> >
> > This patch will cause kernels to crash.
>
> what mainline kernels crash and how will they crash? Fedora and other
> distros have had 4K stacks enabled for years:
>
>   $ grep 4K /boot/config-2.6.24-9.fc9
>   CONFIG_4KSTACKS=y
>
> and we've conducted tens of thousands of bootup tests with all sorts of
> drivers and kernel options enabled and have yet to see a single crash
> due to 4K stacks. So basically the kernel default just follows the
> common distro default now. (distros and users can still disable it)
>
> 	Ingo
> --
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-- 
Thanks,
Oliver