The grub installed with Fedora has a bug that causes xen (and sometimes other kernels) to detect the memory wrong. Bug URLs follow: xen-users mailing list archive: [url]http://lists.xensource.com/archives/html/xen-users/2007-08/msg00028.htm l[/url] Bugzilla: [url]https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=250299[/url] Theoretically, it could be argued that the BIOS is the problem and not grub, I mean, it sounds like Dale's machine was functional without this patch, and MSI isn't exactly a Linux Player. Either way, the patch suggested in those two locations resolved my issue. -----Original Message----- From: fedora-xen-bounces@xxxxxxxxxx [mailto:fedora-xen-bounces@xxxxxxxxxx] On Behalf Of Dustin Henning Sent: Thursday, October 18, 2007 16:00 To: fedora-xen@xxxxxxxxxx Subject: 64-Bit RAM Detection >4GB? I have a Core 2 Quad with 8 GiB of RAM. When I installed FC7 (2.6.22.9-91.fc7), it only detected 4GiB (BIOS detects 8GiB). I added mem=8G to the kernel line in grub.conf, and then Gnome System Monitor showed 7.1GiB (vs I think 4.0). I then changed that to mem=16G, and the Gnome System Monitor shows 7.8 GiB. /proc/meminfo MemTotal shows 8201832kB, so that seems about right. That said, the problem seems to be solved for the kernel mentioned above. However, and this is why I am submitting this to the fedora-xen mailing list, the virtualization kernel (2.6.20-2936.fc7xen) shows 3.1GiB in Gnome System Monitor and 3214456KB in /proc/meminfo MemTotal. Additionally, "xm info" shows 3327 for total memory, so the problem isn't that it is there but not assigned to dom0. I tried the same thing with grub.conf for xen, but it did not work, mem=8G and mem=16G had no effect (this is shown to be a valid parameter in the Xen manual at [http://tx.downloads.xensource.com/downloads/docs/user/#SECTION0413000000000 0000000]). Since it didn't work on the kernel line, I tried it on the module (vmlinuz) line that has the other FC grub arguments, and that did not work either; then I tried placing that on both lines (also to no avail). I also tried dom0_mem=8G on the kernel line, and that caused a kernel panic stating not enough physical memory (got the same thing with dom0_mem=4G). Finally, as a side note, /proc/meminfo VmallocTotal shows 34359738367kB regardless of all of the above, and I don't know if that is normal or not (swap partition is 2GiB). Please let me know if you have fedora 7 x86_64 xen working with >4GB of memory, if there is any additional information that might be helpful, or if you have any suggestions I might try in order to resolve this. Thank you, Dustin -- Fedora-xen mailing list Fedora-xen@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-xen
