RE: FW: 2.4.9/2.4.18 max kernel allocation size

["Ofer Raz" <oraz@checkpoint.com>]

I've done some additional testing.
In order to avoid huge allocations, I've tried allocating 100 blocks of 3MB
each on 2.4.18-10 using vmalloc.

On 1GB physical memory machine I can allocate only 80MB.
When adding memory limit to grub.conf (mem=999M) I get 900MB.

- Ofer


-----Original Message-----
From: linux-kernel-owner@vger.kernel.org
[mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Arjan van de Ven
Sent: Tuesday, October 08, 2002 6:19 PM
To: Ofer Raz
Cc: 'Arjan van de Ven'; wagnerjd@prodigy.net; linux-kernel@vger.kernel.org
Subject: Re: FW: 2.4.9/2.4.18 max kernel allocation size


On Tue, Oct 08, 2002 at 06:17:17PM +0200, Ofer Raz wrote:
> The following code was used in kernel module & called from IOCTL context
in
> order to test the max allocation size possible:

I think you misunderstood. I was asking for the source
of the PROBLEM you
were having, not the test. You are doing something wrong for needing
such a huge vmalloc area, but without the source (it
is gpl code, right?) nobody can do suggestions on how to improve your code.

>
> #define BLOCK_SIZE xxx
>
> for (size = BLOCK_SIZE; size; size--)
> {
>     tmp = vmalloc(size * 1024 * 1024);
>
>     if (tmp)
>     {
>         printk("Allocation of %dMB bytes succeeded!\n", size);
>         vfree(tmp);
>         break;
>     }
> }
>
y
-
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