From: Andy Isaacson <adi@hexapodia.org>
To: Andi Kleen <ak@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Christoph Lameter <clameter@sgi.com>, Mel Gorman <mel@skynet.ie>,
Lee.Schermerhorn@hp.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-mips@linux-mips.org
Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer
Date: Tue, 14 Aug 2007 12:43:56 -0700 [thread overview]
Message-ID: <20070814194356.GL21492@hexapodia.org> (raw)
In-Reply-To: <20070814202350.GT3406@bingen.suse.de>
On Tue, Aug 14, 2007 at 10:23:51PM +0200, Andi Kleen wrote:
> > bcm43xx hardware does show up on low-end MIPS boxes (wrt54g anybody?)
> > that would be sorely hurt by excess copies.
>
> Lowend boxes don't have more than 1GB of RAM. With <= 1GB you don't
> need to copy on bcm43xx.
OK, that makes sense and is reassuring, but note that some MIPS boxes
have only part of their physical memory below 1GB; IIRC the
BCM4704/BCM5836 supports up to 512MB of physical memory, with 256MB in
the first GB and the second 256MB located above the 1GB line. (But it's
been a while since I've run such a machine, so I could be misremembering
the sizes and offsets.)
Yeah, if you stick a PCI chip with a 30-bit PCI DMA mask into a machine
with memory above 1GB, then copying has to happen. Unless the memory
allocator can avoid returning memory in the un-dma-able region...
-andy
next prev parent reply other threads:[~2007-08-14 19:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.64.0708131457190.28445@schroedinger.engr.sgi.com>
[not found] ` <20070813225841.GG3406@bingen.suse.de>
[not found] ` <Pine.LNX.4.64.0708131506030.28502@schroedinger.engr.sgi.com>
[not found] ` <20070813230801.GH3406@bingen.suse.de>
[not found] ` <Pine.LNX.4.64.0708131536340.29946@schroedinger.engr.sgi.com>
[not found] ` <20070813234322.GJ3406@bingen.suse.de>
[not found] ` <Pine.LNX.4.64.0708131553050.30626@schroedinger.engr.sgi.com>
[not found] ` <20070814000041.GL3406@bingen.suse.de>
[not found] ` <20070814002223.2d8d42c5@the-village.bc.nu>
[not found] ` <20070814001441.GN3406@bingen.suse.de>
2007-08-14 19:11 ` [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer Andy Isaacson
2007-08-14 20:23 ` Andi Kleen
2007-08-14 19:43 ` Andy Isaacson [this message]
2007-08-14 21:05 ` Andi Kleen
2007-08-15 11:37 ` Ralf Baechle
2007-08-15 12:59 ` Andi Kleen
2007-08-15 12:32 ` Ralf Baechle
2007-08-15 19:59 ` Christoph Lameter
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