Hi, I just installed a 4 GB memory (2 x 2 GB chips), but /proc/meminfo shows only 3348924 kB installed. I am using: Linux ivan 2.6.20-15-generic #2 SMP Sun Apr 15 06:17:24 UTC 2007 x86_64 GNU/Linux. I looked on Google to try to get ideas, and it sounded like my BIOS might be doing something bad with "MTRRs" and "E820s", but I don't know what these are. It's a Dell Dimension 5150, which I think has a 945G chipset but I'm not sure. Some other people with similar problems posted this kind of output: jared@ivan:~$ dmesg | grep e820 [ 0.000000] BIOS-e820: 0000000000000000 - 00000000000a0000 (usable) [ 0.000000] BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) [ 0.000000] BIOS-e820: 0000000000100000 - 00000000cfe88c00 (usable) [ 0.000000] BIOS-e820: 00000000cfe88c00 - 00000000cfe8ac00 (ACPI NVS) [ 0.000000] BIOS-e820: 00000000cfe8ac00 - 00000000cfe8cc00 (ACPI data) [ 0.000000] BIOS-e820: 00000000cfe8cc00 - 00000000d0000000 (reserved) [ 0.000000] BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved) [ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fed00400 (reserved) [ 0.000000] BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved) [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved) [ 0.000000] BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved) And looking at that, I can see "holes" such as 0xd0000000 through 0xf0000000 which is a pretty large chunk of memory (524 MB). I saw some people who had been able to use mem=4096MB when booting up to fix their issues after changing some settings in their bioses, but my BIOS apparently has no configurable settings for memory and when I try to use this option, my machine appears to be frozen right as it tries to boot up -- I don't even see any bootup messages, just a blank screen and a blinking cursor. I let it blink for about five minutes before I gave up on it. I'm wondering what might cause this, and if there's anything I can try to do to fix it and get the whole 4 GB, or at least more of the 4 GB? Thanks, Jared -- Jared C. Davis <jared@xxxxxxxxxxxxx> 3600 Greystone Drive #604 Austin, TX 78731 http://www.cs.utexas.edu/users/jared/ - To unsubscribe from this list: send the line "unsubscribe linux-x86_64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
