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To: David Gibson <david@gibson.dropbear.id.au>
Cc: James Bottomley <James.Bottomley@steeleye.com>,
       "Adam J. Richter" <adam@yggdrasil.com>, linux-kernel@vger.kernel.org
Subject: Re: [RFC] generic device DMA implementation
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Reply-To: Miles Bader <miles@gnu.org>
System-Type: i686-pc-linux-gnu
Blat: Foop
From: Miles Bader <miles@lsi.nec.co.jp>
Date: 05 Dec 2002 12:17:55 +0900
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David Gibson <david@gibson.dropbear.id.au> writes:
> It seems the "try to get consistent memory, but otherwise give me
> inconsistent" is only useful on machines which:
> 	(1) Are not fully consisent, BUT
> 	(2) Can get consistent memory without disabling the cache, BUT
> 	(3) Not very much of it, so you might run out.
> 
> The point is, there has to be an advantage to using consistent memory
> if it is available AND the possibility of it not being available.
...
> Are there actually any machines with the properties described above?

As I mentioned in my previous message, one of my platforms is like that
-- PCI consistent memory must be allocated from a special pool of
memory, which is only 2 megabytes in size.

-Miles
-- 
`Life is a boundless sea of bitterness'
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