We've found perf xlators io-cache and read-ahead not adding any performance
improvement. At best read-ahead is redundant due to kernel read-ahead and
at worst io-cache is degrading the performance for workloads that doesn't
involve re-read. Given that VFS already have both these functionalities, I
am proposing to have these two translators turned off by default for native
fuse mounts.

For non-native fuse mounts like gfapi (NFS-ganesha/samba) we can have these
xlators on by having custom profiles. Comments?


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