From: Daniel Gryniewicz <dang@fprintf.net>
To: Brian McGrew <Brian@doubledimension.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Help with mapping memory into kernel space?
Date: Wed, 18 Aug 2004 11:30:15 -0400 [thread overview]
Message-ID: <1092843015.14961.2.camel@localhost> (raw)
In-Reply-To: <E6456D527ABC5B4DBD1119A9FB461E3501E00B@constellation.doubledimension.com>
On Tue, 2004-08-17 at 22:39 -0700, Brian McGrew wrote:
> Good day All:
>
<snip>
> The overall problem is that the more system memory we install,
> the fewer IBB's we can use. For instance, 256MB lets us use
> four IBB's; 512MB lets us use three IBB's and so on. Basicly,
> the kernel blows up trying to map memory. Each IBB has two
> banks of 64MB of RAM on them which we try and memmap to system
> memory for speed of addressing. So essentaily, we're sending
> out four camera systems with only 256MB of memory which is only
> about one quarter of what we need.
On x86, the kernel has 1 GiB of address space. Try the 2G/2G split
patches, or the 4G/4G patches, either one of which should increase your
kernel address space enough to map both memory and your buffers.
Daniel
next prev parent reply other threads:[~2004-08-18 15:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-18 5:39 Help with mapping memory into kernel space? Brian McGrew
2004-08-18 7:31 ` William Lee Irwin III
2004-08-18 11:16 ` Mark Hounschell
2004-08-18 20:27 ` William Lee Irwin III
2004-08-18 15:30 ` Daniel Gryniewicz [this message]
2004-08-18 15:59 ` Richard B. Johnson
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