[rhelv6-list] THP: Why are they on by default?

[Troels Arvin]

I've just had a situation with an RHEL 7 server where transparent 
hugepages (THP) might have contributed to a problem. And there are many 
projects/products which recommend turning THP off, eg:

https://docs.oracle.com/database/121/UNXAR/appi_vlm.htm
http://www.cloudera.com/documentation/enterprise/latest/topics/
cdh_admin_performance.html
https://docs.mongodb.org/manual/tutorial/transparent-huge-pages/
http://www.chriscalender.com/disabling-transparent-hugepages-for-tokudb/
http://www-01.ibm.com/support/docview.wss?uid=swg21677458

I have also seen reports about THP ruining the performance on 
workstations.

So which workloads actually benefit significantly from THP?

Does someone know if Red Hat has considered turning them off by default?

(There doesn't seem to be a mailing list for RHEL 7, so I'm using this 
mailing list instead. Which should be OK, as I believe there isn't much 
difference WRT THP between RHEL 6 and 7.)


-- 
Troels Arvin