I've attempted to benchmark cachefs on an ubuntu 10.04 machine using
ext4 on / as the filesystem cache. I've been reading files into memory
using cat and redirecting the output to /dev/null. This seems to
utilize the cache just fine if the file is <= 2 GB. However, if the
file is anything over 2 GB, the cache is completely unused. I'll clear
stop cachefilesd, clear out the file system cache (rm -f -r
/var/cache/fscache/*), and then restart cachefilesd to make sure there's
nothing in it. Then if I cat a 2.1 GB file to /dev/null du shows the
/var/cache/fscache dir as a few KB large. If I do the same thing with a
2 GB file du shows the cache as using 2 GB of disk space.
Is this expected behavior or is there something I'm overlooking?
-Eric
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