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发表于 2006-6-9 09:23:03
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网上有一篇文章说1GB的时候最好不要打开大内存支持,虽然会少128M内存:
Should I enable CONFIG_HIGHMEM for my 1 GB RAM system?
It is advised to not enable CONFIG_HIGHMEM in the kernel to utilize the extra 128 MB you get for your 1 GB RAM system. I/O Devices cannot directly address high memory from PCI space, so bounce buffers have to be used. Plus the virtual memory management and paging costs come with extra mappings. For details on bounce buffers, refer to Mel Gorman's documentation (link below).
http://kerneltrap.org/node/2450 |
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