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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1092843015.14961.2.camel@localhost \
--to=dang@fprintf.net \
--cc=Brian@doubledimension.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.