From: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
To: Paul Powell <moloch16@yahoo.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Linux driver: __get_free_pages()
Date: Thu, 11 Jan 2001 17:09:03 -0200 [thread overview]
Message-ID: <20010111170903.A9711@conectiva.com.br> (raw)
In-Reply-To: <20010111203933.17385.qmail@web119.yahoomail.com>
In-Reply-To: <20010111203933.17385.qmail@web119.yahoomail.com>; from moloch16@yahoo.com on Thu, Jan 11, 2001 at 12:39:33PM -0800
Em Thu, Jan 11, 2001 at 12:39:33PM -0800, Paul Powell escreveu:
> Our driver is trying to allocate a DMA buffer to flash an adapter's
> firmware. This can require as much as 512K ( of contiguous DMA memory ).
> We are using the function __get_free_pages( GFP_KERNEL | GFP_DMA, order)
> . The call is failing if 'order' is greater than 6. The problem is seen
> on systems with system memory of only 64MB. It works fine on systems
> with more memory. Does it make sense that a system with 64MB would not
> have 512K ( contiguous ) available? The most that can be allocated
> successfully on the 64MB system appears to be 256K. (Nothing else is
> running that would eat up 64MB of memory).
> Does this make sense and/or is there another way that the DMA memory
> could be allocated successfully?
look at mm/bootmem.c
- Arnaldo
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next prev parent reply other threads:[~2001-01-11 20:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-11 20:39 Linux driver: __get_free_pages() Paul Powell
2001-01-11 19:09 ` Arnaldo Carvalho de Melo [this message]
2001-01-11 21:01 ` Richard B. Johnson
2001-01-11 19:26 ` Arnaldo Carvalho de Melo
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