FYI...
https://www.postgresql.org/message-id/20180102222354.qikjmf7dvnjgbkxe@alap3.anarazel.de
In reply to Jerry Lau
Re: Fix for intel hardware bug will lead to performance regressions by as much at 17%
by Matteo Scaramuccia -
Hi Jerry,
worht mentioning here Redis too: https://gist.github.com/antirez/9e716670f76133ec81cb24036f86ee95
BUT if you are running single service server nodes with trusted management you could seriously evaluate not to activate the fixes for Meltdown and Spectre by configuring your kernel image like RHEL explained in describing their back-ports: https://access.redhat.com/articles/3311301 .
HTH,
Matteo