Gluster users - Feb 2019 - Disabling read-ahead and io-cache for native fuse mounts

https://review.gluster.org/22203

On Tue, Feb 12, 2019 at 5:38 PM Raghavendra Gowdappa <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
>
> regards,
> Raghavendra
>
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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
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> https://lists.gluster.org/mailman/listinfo/gluster-users
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