cciss: Adds simple mode functionality

[karo-tx-linux.git] / Documentation / blockdev / cciss.txt

diff --git a/Documentation/blockdev/cciss.txt b/Documentation/blockdev/cciss.txt
index c00c6a5ab21f6b0d253bf465eb6e1274d5994d18..71464e09ec1841a39f031d972b281488e5d703af 100644 (file)
--- a/Documentation/blockdev/cciss.txt
+++ b/Documentation/blockdev/cciss.txt
@@ -78,6 +78,16 @@ The device naming scheme is:
 /dev/cciss/c1d1p2              Controller 1, disk 1, partition 2
 /dev/cciss/c1d1p3              Controller 1, disk 1, partition 3
 
+CCISS simple mode support
+-------------------------
+
+The "cciss_simple_mode=1" boot parameter may be used to prevent the driver
+from putting the controller into "performant" mode. The difference is that
+with simple mode, each command completion requires an interrupt, while with
+"performant mode" (the default, and ordinarily better performing) it is
+possible to have multiple command completions indicated by a single
+interrupt.
+
 SCSI tape drive and medium changer support
 ------------------------------------------