From: Oliver Neukum <oliver@neukum.org>
To: "tek-life" <teklife.kernel@gmail.com>
Cc: linux-kernel@vger.kernel.org, ebiederm@xmission.com
Subject: Re: Can we remove the Zone_DMA?
Date: Sun, 4 Apr 2010 09:31:00 +0200 [thread overview]
Message-ID: <201004040931.00634.oliver@neukum.org> (raw)
In-Reply-To: <m2mc58e39921004032121hc7ca41f0gacd90ffe2abc6444@mail.gmail.com>
Am Sonntag, 4. April 2010 06:21:54 schrieb tek-life:
> In Linux , The Memory is divided to three zone. They are ZONE_DMA
> 、ZONE_NORMAL and ZONE_HIGHMEM. From the book of "Undstand the Linux
> kernel ", the ZONE_DMA has the effect that the Direct Memory Access
> (DMA) processors for old ISA buses have a strong limitation: they are
> able to address only the first 16 MB of RAM. SO ,we must set a zone
> for the DMA on ISA bus. And I suspect that the hardware has
> developed so quickly .And in this days the ISA has been weeded out.
Floppy disks & paralell ports still use DMA
Regards
Oliver
next prev parent reply other threads:[~2010-04-04 7:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-04 4:21 tek-life
2010-04-04 5:07 ` Daniel Hazelton
[not found] ` <k2tc58e39921004032226ze2eb64dev21f8c2d137a49ebc@mail.gmail.com>
2010-04-04 5:33 ` Fwd: " tek-life
2010-04-04 7:49 ` Daniel Hazelton
2010-04-04 8:16 ` Thomas Fjellstrom
2010-04-04 8:28 ` tek-life
2010-04-04 8:28 ` tek-life
2010-04-04 8:38 ` Eric W. Biederman
2010-04-12 8:41 ` Andi Kleen
2010-04-18 11:04 ` Bernd Petrovitsch
2010-04-19 13:44 ` Lennart Sorensen
2010-04-04 7:31 ` Oliver Neukum [this message]
2010-04-04 9:07 ` Joerg Roedel
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