performance is not a reason to run 32bit kernel [LWN.net]

performance is not a reason to run 32bit kernel

Posted May 27, 2008 17:20 UTC (Tue) by dlang (guest, #313)
In reply to: performance is not a reason to run 32bit kernel by khim
Parent article: Kernel prepatch 2.6.26-rc4

not to mention the fact that in 32 bit mode you only have 8 registers available, but in 64 bit
mode you have 16 available.

most of the other architectures that have 32 bit and 64 bit options on the same chip have the
same number of registers available in both modes, so on those chips the increased code size
causes a performance hit (unless you need to access more ram), but on AMD64/x86_64 the number
of registers available doubles in 64 bit mode.

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