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

[Raghavendra Gowdappa]

On Tue, Feb 12, 2019 at 11:09 PM Darrell Budic <budic at onholyground.com>
wrote:

> Is there an example of a custom profile you can share for my ovirt use
> case (with gfapi enabled)?
>

I was speaking about a group setting like "group metadata-cache". Its just
that custom options one would turn on for a class of applications or
problems.

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
>
> 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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