CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

Number of L1 cache lines reserved for CVMSEG memory

configname: CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE

Linux Kernel Configuration
└─>Number of L1 cache lines reserved for CVMSEG memory
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
CVMSEG LM is a segment that accesses portions of the dcache as a
local memory; the larger CVMSEG is, the smaller the cache is.
This selects the size of CVMSEG LM, which is in cache blocks. The
legally range is from zero to 54 cache blocks (i.e. CVMSEG LM is
between zero and 6192 bytes).