netdev - RE: testing and validating 64-bit addressing.

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Date:	Mon, 18 Nov 2013 10:24:44 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Rayagond K" <rayagond@...avyalabs.com>,
	"netdev" <netdev@...r.kernel.org>
Subject: RE: testing and validating 64-bit addressing.

> I have one Ethernet card which supports 64-bit DMA addressing and I
> need to implement this feature and test it.
...
> 3. Installed the 64-bit operating system on 64-bit architecture -
> Fedora 15, 64 bit os , LINUX 3.8.0 kernel, Intel dual core processor,
> 4GB RAM.
...
> 1. Why are we always getting 33-bit address only ?

Because the physical memory is aligned to the bottom of the
physical memory map.
The only reason you see addresses above 4B is that there
is a great big address block (typically from 3G or 3.5G) reserved
for PCI devices.

	David



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