On 2022-09-12 11:40, Martin K. Petersen wrote:

quoted

Because write-zero requests may be slow and most (but not all) discard
requests read back as zeros, this work uses only discard requests.

REQ_OP_WRITE_ZEROES will pick the most optimal way to guarantee that all
blocks in the requested range will return zeroes for subsequent reads.

Makes sense to me. I wanted to use WRITE_ZEROS but was disappointed in
the performance even on the nvme drive we tested. I'll respin this to
use WRITE_ZEROS and maybe we can do some investigation on more NVMe
drives to see if more of them might do it efficiently.

Thanks,

Logan