Some suggested minor performance tweaks

[Samuel Tai]

Tunables:

1. Sysctl tunable: net.inet.carp.allow=0 - Gets rid of the annoying boot delay from trying to negotiate high availability; reboot to have it take effect. This seems to be a carryover from iX's commercial offerings. If you're running only a single node, you don't need multi-chassis HA.
2. Loader tunables:
   if_bnxt_load=NO
if_qlxgbe_load=NO - Don't load kernel 10G NIC drivers. If you don't have the requisite NIC hardware, this frees up a little bit of kernel memory.

Tasks:

1. Pre-init task to kldunload t4_tom - Unload a rather persistent kernel Chelsio 10G NIC driver. If you don't have this NIC, free up some kernel memory.

 

[Basil Hendroff]

Thanks for the tips! Does this apply to earlier FreeNAS versions as well? Tunables are a mystery to me. I wonder if it's worthwhile creating a resource for tunables a bit like @Ericloewe's ZFS Feature Flags in FreeNAS?