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

Raghavendra Gowdappa rgowdapp at redhat.com
Tue Feb 12 13:22:43 UTC 2019


On Tue, Feb 12, 2019 at 5:38 PM Raghavendra Gowdappa <rgowdapp at redhat.com>

> All,
> 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
> regards,
> Raghavendra
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