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Recommended squashfs decompressor (DECOMP_MULTI)
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Massimo B.
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Joined: 09 Feb 2005
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Location: Germany

PostPosted: Mon Mar 24, 2014 7:48 am    Post subject: Recommended squashfs decompressor (DECOMP_MULTI) Reply with quote

Hi, I wonder with latest sources (3.13.5-ck) which squashfs decompressor implementation is recommended for a recent quad-core arch like the core-i5:
  • CONFIG_SQUASHFS_DECOMP_MULTI
    Quote:
    This decompressor implementation uses up to two parallel decompressors per core. It dynamically allocates decompressors on a demand basis.

  • CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU
    Quote:
    This decompressor implementation uses a maximum of one decompressor per core. It uses percpu variables to ensure decompression is load-balanced across the cores.
From the comments I guess the DECOMP_MULTI also does a sharing per cpu but rather 2x per cpu, while the DECOMP_MULTI_PERCPU only does 1x per cpu. That would mean 8 procs on the quadcore for the first and 4 procs for the second. The first would mean higher parallelization, right?
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