zfs and BIO_FLUSH on amr(4)

[Simun Mikecin]

Using storage on amr(4) controller with zfs revealed reduced write performance.
It seems that writing to zfs concludes with a BIO_FLUSH call to flush the controller cache to
disk.

amr(4) can have onboard cache memory with or without battery backup. Is BIO_FLUSH call really
needed when amr(4) is used with onboard cache memory with a battery backup?



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