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10.6: How to boot into the 64-bit kernel
Authored by: efseiler on Mar 02, '10 07:06:52AM

One last thing I noticed about using the 64-bit kernel is the cooler operation. When running the mini at full bore (in this instance recompiling a complex port) the core temperature never rose above 175F whereas when using the i386 kernel the core temperature would frequently rise above 200F!

--Damien

Edited on Mar 02, '10 07:08:11AM by efseiler



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10.6: How to boot into the 64-bit kernel
Authored by: efseiler on Mar 05, '10 07:28:24AM

As a final note...according to Wikipedia:

"K64 has several benefits compared to K32:
Can manage more than 32 GB RAM, as the memory map would consume a disproportionately large area of the 32-bit kernel space.
Cache buffer sizes can be larger than what the 32-bit kernel space allows, potentially increasing I/O performance.
Performance is increased when using high-performance networking devices or multiple GPUs, as the kernel can map all of the devices in 64-bit space even if several have very large DMA buffers.
Booting while holding down 6 and 4 will force the machine to boot K64 on machines supporting 64-bit kernels. K64 will run 32-bit applications but it will not run 32-bit kernel extensions (KEXTs) so these must be ported to K64 to be able to load."



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