On Wednesday, 30 March 2005 at 16:01:14 -0700, Scott Long wrote: > Greg 'groggy' Lehey wrote: >> On Wednesday, 30 March 2005 at 14:35:46 -0800, Steve Kargl wrote: >> >>> On Thu, Mar 31, 2005 at 07:54:39AM +0930, Greg 'groggy' Lehey wrote: >>> >>>> None of these problems occur when I use 4 GB memory. About the only >>>> strangeness, which seems to come from the BIOS, is that it recognizes >>>> only 3.5 GB. If I put all DIMMS in, it recognizes the full 8 GB >>>> memory. >>> >>> I had 4 bad out of 12 tested where the DIMMs were Crucial PC2700 2GB >>> Reg. ECC DIMMs. >> >> OK, this makes sense. It might also explain why the 4 GB >> configuration only recognizes 3.5 GB. > > No, and I'm going to make this an FAQ and post it in a very obvious > place, since 4+ GB is so easy to get and people don't seem to understand > the PC architecture very well.
That's not easy to understand when it's barely documented. Thanks for the info: it helps a lot. This may still be a hint, though: that memory hole doesn't show up during a boot with 8 GB RAM. How come? Is the system trying to map RAM over the PCI hole? It looks as if I should get a verbose boot listing with 8 GB. It'll be a couple of hours before I find time to reboot this machine. In the meantime, there's a verbose boot with 4 GB at http://www.lemis.com/grog/Images/20050331/obelix-dmesg. I'm told it shows a number of strange things, including incorrect reporting of on-chip cache sizes. Greg -- See complete headers for address and phone numbers.
pgpqVG3rp0uyU.pgp
Description: PGP signature