Observations from some very unscientific testing. Testing was done with
fio using 8 parallel jobs doing random reads in an amd64 VM with 8
cores.

* The kernel in comment #10 and 4.4.0-45 (with
SQUASHFS_DECOMP_MULTI_PERCPU) performed comparably for the most part.
4.4.0-47 (with CONFIG_SQUASHFS_DECOMP_SINGLE) was somewhat slower.

* With 4K and 128K block sizes, I did not see the kernel from comment
#10 falling back to using the data block cache at all during my tests.
With a 1M block size it was falling back to the data block cache
sometimes.

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https://bugs.launchpad.net/bugs/1636847

Title:
  unexpectedly large memory usage of mounted snaps

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