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Diffstat (limited to 'Documentation/admin-guide/device-mapper/dm-crypt.rst')
| -rw-r--r-- | Documentation/admin-guide/device-mapper/dm-crypt.rst | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/admin-guide/device-mapper/dm-crypt.rst b/Documentation/admin-guide/device-mapper/dm-crypt.rst index aa2d04d95df6..48a48bd09372 100644 --- a/Documentation/admin-guide/device-mapper/dm-crypt.rst +++ b/Documentation/admin-guide/device-mapper/dm-crypt.rst @@ -113,6 +113,11 @@ same_cpu_crypt The default is to use an unbound workqueue so that encryption work is automatically balanced between available CPUs. +high_priority + Set dm-crypt workqueues and the writer thread to high priority. This + improves throughput and latency of dm-crypt while degrading general + responsiveness of the system. + submit_from_crypt_cpus Disable offloading writes to a separate thread after encryption. There are some situations where offloading write bios from the @@ -155,6 +160,23 @@ iv_large_sectors The <iv_offset> must be multiple of <sector_size> (in 512 bytes units) if this flag is specified. + +Module parameters:: + max_read_size + Maximum size of read requests. When a request larger than this size + is received, dm-crypt will split the request. The splitting improves + concurrency (the split requests could be encrypted in parallel by multiple + cores), but it also causes overhead. The user should tune this parameters to + fit the actual workload. + + max_write_size + Maximum size of write requests. When a request larger than this size + is received, dm-crypt will split the request. The splitting improves + concurrency (the split requests could be encrypted in parallel by multiple + cores), but it also causes overhead. The user should tune this parameters to + fit the actual workload. + + Example scripts =============== LUKS (Linux Unified Key Setup) is now the preferred way to set up disk |