[Gluster-users] Disabling read-ahead and io-cache for native fuse mounts

Raghavendra Gowdappa rgowdapp at redhat.com
Tue Feb 12 12:08:00 UTC 2019


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?

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1665029

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