I have seen a few systems (such as HP Proliant servers) where you need to populate the DIMM slots in order, or it won't necessarily see all the RAM. Wonder if thats the problem.
Back to lurking/clearing my E-mail backlog. Paul. On Tue, 16 Feb 2021 at 16:06, Henrique de Moraes Holschuh <h...@debian.org> wrote: > On Sat, 13 Feb 2021, Charlie Gibbs wrote: > > [This would probably be an FAQ if I knew the proper incantation...] > > Well, sorta.... > > > I realized recently that a box I've been running for a while isn't seeing > > all of its installed memory. The BIOS screens indicate that 8GB is > > installed, but Debian (recently upgraded to Buster) only sees a bit over > > 3GB. > > > > cjg@dragon:~$ head -1 /proc/meminfo > > MemTotal: 3331096 kB > > > > During boot I noticed the following message: > > > > [ 0.012080] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, > > losing 4800MB of RAM. > > 1. UPDATE THE BIOS (UEFI), really. > > 2. Once it is up-to-date, review BIOS settings. You might have > something strange in there. Check stuff like "memory window", anything > that make mentions to "hole" (PCI, memory, etc), and memory set aside > for GPUs, etc. > > Maybe reset BIOS/UEFI to defaults, and change one setting at a time > until it is back the way you want it, to isolate what setting might be > causing it. -- be careful to ensure the boot stuff is correct for what > you need, though. Copy the settings you have to paper before you reset. > > Only if all else fails, you try the kernel command line switches to mess > with this :-( > > > Is there some sort of HOWTO that covers this stuff? Where do I go from > > here? > > Try fixing the real problem first (whatever is making your BIOS set > these incorrectly). Your system might become quite unpredictable > otherwise, depending on the reason these MTRRs are set like that. > > -- > Henrique Holschuh > > -- *Paul Duncan* Lead Marine Technician, RV Falkor SCHMIDT OCEAN INSTITUTE mobile +1 650 387 4151 VOIP +1 954 672 4943 www.schmidtocean.org Follow us on Twitter, Facebook and Google+ *This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged* *information. Any unauthorized review, use, disclosure or distribution is prohibited. If you have received it in* *error, please advise the sender by reply email and delete the message and any attachments. Thank you.*
