linux-kernel - Re: x86: 4kstacks default

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Message-ID: <6101e8c40804190735g17f1e0bj25c2bc0e2a6eac26@mail.gmail.com>
Date:	Sat, 19 Apr 2008 16:35:31 +0200
From:	"Oliver Pinter" <oliver.pntr@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Christoph Hellwig" <hch@...radead.org>,
	"David Chinner" <dgc@....com>, xfs@....sgi.com
Subject: Re: x86: 4kstacks default

Hi Ingo!

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



On 4/19/08, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Andrew Morton <akpm@...ux-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
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