Single threaded compression

configname: CONFIG_SQUASHFS_DECOMP_SINGLE

Decompressor parallelisation options
└─>Single threaded compression
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Traditionally Squashfs has used single-threaded decompression.
Only one block (data or metadata) can be decompressed at any
one time. This limits CPU and memory usage to a minimum.