After installing a second 512MB SODIMM into my laptop, I noticed that my 2.6.18.3 kernel only detected and used 896MB of the resulting 1GB, and informed me that I needed to enable high memory in order to access the remaining 127MB.
While doing so, I noticed that the help text stated that enabling high memory (in my case, CONFIG_HIGHMEM4G) should only be done if the system the kernel is running on has more than 1GB, but less than 4GB - it said that systems with 1GB should leave it off, which resulted in an eighth of the installed memory going missing. A bit more research found a three year old thread on this list where it was stated that enabling CONFIG_HIGHMEM4G sometimes slows the system down due to sometimes undesirable changes to the way the kernel sets up the memory map. Basically, all I want to know is whether or not enabling CONFIG_HIGHMEM4G for a laptop that has exactly 1GB of RAM will result in any performance degradation. TIA, Brad P.S: Direct replies please - I'm not subscribed to the list. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
