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Date: Mon, 16 Apr 2007 16:17:22 +0200 From: Stefan Richter <stefanr@...6.in-berlin.de> To: Jeff Chua <jeff.chua.linux@...il.com> CC: linux-kernel@...r.kernel.org Subject: Re: 4GB Physical. Less than 3GB in Linux. Jeff Chua wrote: > I've noticed that with 4GB physical ram, I'm only see 3098000 MB on > the Dell 745, and 3107056MB on the IBM X60s. > > I've tested with CONFIG_HIGHMEM4G=y, CONFIG_HIGHMEM64G=y, > CONFIG_X86_PAE=y, but nothing makes any difference. > > Tested on Linux 2.6.20, Linux 2.6.21-rc7. The X60 most certainly contains a chipset which severely limits the amount of accessible RAM due to issues with remapping of PCIe addresses. Intel explains it somewhere on their web presence. A quick & lazy web search turned this Intel paper up: http://www.polywell.com/us/support/faq/4GB_Rev1.pdf -- Stefan Richter -=====-=-=== -=-- -==-= http://arcgraph.de/sr/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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