linux-kernel - Re: Why is "Memory split" Kconfig option only for EMBEDDED?

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Message-ID: <20061209160159.GA6090@stusta.de>
Date:	Sat, 9 Dec 2006 17:01:59 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Norbert Kiesel <nkiesel@...networks.com>
Cc:	Alejandro Riveira Fernández 
	<ariveira@...il.com>, Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Why is "Memory split" Kconfig option only for EMBEDDED?

On Sat, Dec 09, 2006 at 04:45:04PM +0100, Norbert Kiesel wrote:
> On Sat, 2006-12-09 at 13:27 +0100, Alejandro Riveira Fernández wrote:
> > El Wed, 6 Dec 2006 14:10:03 +0100
> > Adrian Bunk <bunk@...sta.de> escribió:
> > 
> > > On Wed, Dec 06, 2006 at 01:19:08PM +0100, Norbert Kiesel wrote:
> > > > On Wed, 2006-12-06 at 12:58 +0100, Arjan van de Ven wrote:
> > > > > On Wed, 2006-12-06 at 12:42 +0100, Norbert Kiesel wrote:
> > > > > > Hi,
> > > > > > 
> > > > > > I remember reading on LKML some time ago that using VMSPLIT_3G_OPT would
> > > > > > be optimal for a machine with exactly 1GB memory (like my current
> > > > > > desktop). Why is that option only prompted for after selecting EMBEDDED
> > > > > > (which I normally don't select for desktop machines
> > > > > 
> > > > > because it changes the userspace ABI and has some other caveats.... this
> > > > > is not something you should muck with lightly 
> > > > > 
> > > > 
> > > > Hmm, but it's also marked EXPERIMENTAL. Would that not be the
> > > > sufficient?  Assuming I don't use any external/binary drivers and a
> > > > self-compiled kernel w//o any additional patches: is there really any
> > > > downside?
> > > 
> > > - Wine doesn't work (I'm not sure about VMSPLIT_3G_OPT, but
> > >                      VMSPLIT_2G definitely breaks Wine)
> > 
> >  I use VMSPLIT_3G_OPT=y and wine works just fine (only tested with one
> >  program). Edgy + 2.6.19-rc1
> > 
> > 
> > 
> > > - AFAIR some people reported problems with some Java programs
> > >   after fiddling with the vmsplit options
> > > 
> > > EMBEDDED isn't exactly the right way to hide it, but the vmsplit options 
> > > aren't something you can safely change.
> > > 
> 
> So far all first-hand experiences I heard of were positive (i.e. I did
> not get an emaail from anyone saying: It had a negative effect for me),
>...

As I said, VMSPLIT_2G does break Wine for me.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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