Fragmentation.
you have 32-pages scattered around the place, they are not in the one
place, you are asking for 32-contiguous pages, you cannot get this as
the memory is fragmented.
you should really never try allocating that many contiguous pages.
Dave.
On 6/2/06, Abu M. Muttalib <[email protected]> wrote:
Hi,
I repeat my question, the required no of pages are available, as shown in
the dump produced by kernel, the request is not fulfilled. Its as follows:
DMA: 106*4kB 11*8kB 5*16kB 3*32kB 2*64kB 1*128kB 0*256kB 0*512kB 0*1024kB =
944kB
Why this is so??
~Abu.
-----Original Message-----
From: Jesper Juhl [mailto:[email protected]]
Sent: Friday, June 02, 2006 12:36 PM
To: Abu M. Muttalib
Cc: Martin J. Bligh; Paulo Marques; [email protected]
Subject: Re: Page Allocation Failure, Why?? Bug in kernel??
On 02/06/06, Abu M. Muttalib <[email protected]> wrote:
> Hi,
>
> That's precisely I want to say. The PAGES are available but they are not
> allocated to process. Why??
>
There may be 32 pages available in total, but not 32 contiguous ones -
that's a *lot* of contiguous pages to ask for in kernel space - 128KB
(assuming a 4096 byte page size).
--
Jesper Juhl <[email protected]>
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please http://www.expita.com/nomime.html
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