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

Darrell Budic budic at onholyground.com
Tue Feb 12 17:39:12 UTC 2019

Is there an example of a custom profile you can share for my ovirt use case (with gfapi enabled)? Or are you just talking about the standard group settings for virt as a custom profile?

> On Feb 12, 2019, at 7:22 AM, Raghavendra Gowdappa <rgowdapp at redhat.com> wrote:
> https://review.gluster.org/22203 <https://review.gluster.org/22203>
> On Tue, Feb 12, 2019 at 5:38 PM Raghavendra Gowdappa <rgowdapp at redhat.com <mailto:rgowdapp at redhat.com>> wrote:
> 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 <https://bugzilla.redhat.com/show_bug.cgi?id=1665029>
> regards,
> Raghavendra
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