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18 Dec 08
Juraj KazdaTo check whether your kernel is configured to use all your RAM, enter the command free -m. This command gives you the total amount of unused RAM on your system, as well as the size of your swap file, in megabytes. If the total memory is 885, then no high memory is enabled on your system (the rest of the first gigabyte is reserved by the kernel for its own purposes). Similarly, if the result shows over 1 gigabyte but less than 4GB when you know you have more, then the 4GB parameter is enabled, but not the 64GB one. In either case, you will need to add a new kernel to take full advantage of your RAM.\n\nOn some distributions, you can add a generic kernel that meets your requirement in a matter of moments. In Debian, for instance, use the apt-cache search command to locate a recent linux-image package for a kernel for a 686 processor if you want support for up to 4 gigabytes. If you want support for up to 64 gigabytes, look for a kernel that ends with 686-bigmem. These kernels will enable support for 64GB. Unfortunately, a generic kernel for only 4GB does not exist. Similarly, in Ubuntu, look for a recent kernel image whose package name ends in smp; these kernels are designed for dual core processors, but work on single core processors as well, although sometimes with a small performance hit.\n\nIf your distribution does not include a useful generic kernel, or if you want to fine-tune the use of high memory on your system, you need to compile a custom kernel. You should consult your distribution's documentation for the details of where to get the source code and headers and any unique aspects of compiling a kernel for it. However, enabling high memory support involves no more than five parameters in the Firmware Drivers section:\n\n * Make sure that CONFIG_NOHIGHMEM is not set.\n * Set either CONFIG_HIGHMEM4G or CONFIG_HIGHMEM64G to yes, using whichever one is appropriate for the RAM in your system. If you have Note that you should use the 4 gigabyte parameter for less than 4 gigabytes of RAM, and the 64 gigab
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28 Sep 07
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Calamity FactorsGot more than a gig of RAM and 32-bit Linux? Here's how to use it
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26 Sep 07
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21 Sep 07
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