Re: experiences beyond 4 GB RAM with 2.4.22

[Marcelo Tosatti]

On Wed, 17 Sep 2003, Jens Axboe wrote:

> On Wed, Sep 17 2003, Alan Cox wrote:
> > On Maw, 2003-09-16 at 20:58, Olivier Galibert wrote:
> > > On Tue, Sep 16, 2003 at 04:29:02PM +0100, Alan Cox wrote:
> > > > The kernel has no idea what you will do with given ram. It does try to
> > > > make some guesses but you are basically trying to paper over hardware
> > > > limits.
> > > 
> > > Is there a way to specifically turn that ram into a tmpfs though?
> > 
> > 
> > Something like z2ram copied and hacked a little to kmap the blocks it
> > wants would give you a block device you could use for swap or for /tmp.
> > Im not sure tmpfs would work here
> 
> Aditionally, you need GFP_DMA32 or similar. Would also alleviate the
> nasty pressure on ZONE_NORMAL which is often quite stressed.

IMO such GFP_DMA32 flag is a bit intrusive for 2.4, isnt it?

What has been done in 2.6 in respect to the excessive normal zone 
pressure and bounce buffering problems? 

Thanks 

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