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authorMikulas Patocka <mpatocka@redhat.com>2015-02-13 08:23:09 -0500
committerMike Snitzer <snitzer@redhat.com>2015-02-16 11:10:59 -0500
commitf3396c58fd8442850e759843457d78b6ec3a9589 (patch)
treeb91199cf703350661510f5d2eafd98edd54ba11f /Documentation/device-mapper
parent37527b869207ad4c208b1e13967d69b8bba1fbf9 (diff)
downloadblackbird-op-linux-f3396c58fd8442850e759843457d78b6ec3a9589.tar.gz
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dm crypt: use unbound workqueue for request processing
Use unbound workqueue by default so that work is automatically balanced between available CPUs. The original behavior of encrypting using the same cpu that IO was submitted on can still be enabled by setting the optional 'same_cpu_crypt' table argument. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'Documentation/device-mapper')
-rw-r--r--Documentation/device-mapper/dm-crypt.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/device-mapper/dm-crypt.txt b/Documentation/device-mapper/dm-crypt.txt
index c81839b52c4d..571f24ffc91c 100644
--- a/Documentation/device-mapper/dm-crypt.txt
+++ b/Documentation/device-mapper/dm-crypt.txt
@@ -51,7 +51,7 @@ Parameters: <cipher> <key> <iv_offset> <device path> \
Otherwise #opt_params is the number of following arguments.
Example of optional parameters section:
- 1 allow_discards
+ 2 allow_discards same_cpu_crypt
allow_discards
Block discard requests (a.k.a. TRIM) are passed through the crypt device.
@@ -63,6 +63,11 @@ allow_discards
used space etc.) if the discarded blocks can be located easily on the
device later.
+same_cpu_crypt
+ Perform encryption using the same cpu that IO was submitted on.
+ The default is to use an unbound workqueue so that encryption work
+ is automatically balanced between available CPUs.
+
Example scripts
===============
LUKS (Linux Unified Key Setup) is now the preferred way to set up disk
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