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).