Yes, never reported by Redis users so far, maybe since in Redis it does not have the same impact it has in other databases, but a more subtle latency issue apparently.
EDIT: Actually in the CouchBase case they talk about "page allocation delays" that looks related, potentially. I started the investigation mainly because the Stripe graph looked suspicious with a modern EC2 instance type that has good fork times, so there was something more indeed (unless the test was performed with tens of GB of data).
the doc recommends adding "transparent_hugepage=never" to the kernel boot line in the "/etc/grub.conf" file.
[1] http://oracle-base.com/articles/linux/configuring-huge-pages...
[2] https://support.oracle.com/epmos/faces/DocContentDisplay?id=...
[3] http://blog.couchbase.com/often-overlooked-linux-os-tweaks