On 8/11/2014 3:30 PM, Bruce Dubbs wrote: > I upgraded an older system's version of seamonkey today and noticed > that it was causing some swapping. I had 2G of RAM, but the system > can take up to 4G. > > I plugged it in and indeed, the bios tells me that 4G is present. > > However when I boot, the kernel does not find it all. > > The system is a 10 year old 686 and from dmesg: > > DMI: Dell Inc. Precision WorkStation 370 /0 M3849, BIOS A04 03/16/2005 > > [ 0.000000] 887MB LOWMEM available. > [ 0.000000] mapped low ram: 0 - 377fe000 > [ 0.000000] low ram: 0 - 377fe000 > [ 0.000000] Zone PFN ranges: > [ 0.000000] DMA 0x00000010 -> 0x00001000 > [ 0.000000] Normal 0x00001000 -> 0x000377fe > [ 0.000000] HighMem 0x000377fe -> 0x000bfe8a > > [ 0.000000] Memory: 3112504k/3144232k available (3678k kernel code, > 31280k reserved, 1423k data, 340k init, > 2234928k highmem) > > In other words, Linux only sees 3112504k. I suspect a kernel > misconfiguration, but what? > > I know the kernel is old (3.4.1) and I can update that, but I should > also be able to use that kernel version for this system. > > The config is at > http://anduin.linuxfromscratch.org/~bdubbs/files/config-3.4.1-4 > > I do have CONFIG_HIGHMEM4G=y but don't think CONFIG_HIGHMEM64G is > needed. In any case I tried changing this and got no change in > available memory. > > I did try a commercial distro (SuSE) to see if they do any better, but > they didn't. Am I just stuck with 76% of installed memory? > > I will note that the 3G of memory did solve the swapping, but I should > be able to access all the memory. > > I also explored the BIOS a bit and hyper-threading was turned off > somehow. I reset it on and that helped the browser responsiveness a bit. > > > -- Bruce >
Other devices consuming some address space (eg graphics)? I've had 32-bit systems with DSP card plugged in gthat could only see 3G because each DSP card consumed a part of the address space. - Geoff -- http://lists.linuxfromscratch.org/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page Do not top post on this list. A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? http://en.wikipedia.org/wiki/Posting_style
