On Tuesday 11 February 2003 17:11, Martin J. Bligh wrote:
> > i would like to allocate more than 2 GB of memory on an IA32
> > architecture.
> >
> > The machine is a dual XEON_DP with 3 GB of Ram and 4 GB of swap space.
> >
> > I have tried with the default SUSE 8.1 kernel as well as with a
> > 2.4.20-pre4aa1 Kernel compile by my own using these Options:
> >
> > CONFIG_HIGHMEM4G=y
> > CONFIG_HIGHMEM=y
> > CONFIG_1GB=y
> >
> > but I am only able to allocate 2 GB with a single malloc call.
> > I tought it should be possible to allocate up to 2.9 GB of memory to a
> > process, with this kernel settings.
>
> Well, assuming you had no user-space code or data, or a stack, or any
> shared libraries to fit into that space as well ;-)
>
> Try shifting TASK_UNMAPPED_BASE down from 1GB to 0.5GB - that should give
> you some more breathing room, though you'll never get to 2.9GB.
>
> M.
First of all I would like to say THANK YOU for your help.
I am now able to allocate up to ~3.2 GB of memory on a 4 GB Machine, even with
shared libraries.
This is what I have done.
1. I have activated the kernel option in Kernel 2.4.21pre4aa3
CONFIG_05GB=y
This gives the following:
a: TASK_UNMAPPED_BASE is now 0xe000000 wich is 224 MB
b: Upper Limit for User-Space memory is now at 3.5 GB
So I have the potential to allocated up to 3360 MB of memory
2. I have exchanged malloc with anonymous mmap, since malloc
was still only able to allocate about 2 GB.
-- ----------------------------------------------------------------------------- Hartmut Manz WWW: http://www.intes.de INTES GmbH Phone: +49-711-78499-29 Schulze-Delitzsch-Str. 16 Fax: +49-711-78499-10 D-70565 Stuttgart E-mail: manz@intes.de Ein Mensch sieht, was vor Augen ist; der Herr aber sieht das Herz an. ------------------------------------------------------- 1. Samuel 16, 7 ------ To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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