How to enable NVMe SSD write caching on FreeBSD ?

How is this server going to be used? You're looking to accelerate reads, accelerate writes or accelerate both?
 
How is this server going to be used? You're looking to accelerate reads, accelerate writes or accelerate both?
IDE write caching can be enabled or disabled by
Code:
sysctl hw.ata.wc
,
but I don't know if this method is suitable for NVMe.
Thanks.
 
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