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Read and write work queue significantly degrades performance on SSD/NVME devices[1]. In Debian 11 crypttab does not support no-read-workqueue and no-write-workqueue flags, so the persistent flag is workaround: once opened with perf parameters persists forever. [1] https://blog.cloudflare.com/speeding-up-linux-disk-encryption/ Signed-off-by: Yauhen Artsiukhou <jsirex@gmail.com>