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authorKai Makisara <Kai.Makisara@kolumbus.fi>2008-02-24 22:23:24 +0200
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-04-07 12:15:39 -0500
commit40f6b36c6243462fb95d0343237331c423494b03 (patch)
tree456b78c5647684527e0104463dd45b8e93ea9d81 /Documentation/scsi
parentd35055a0f2637f29f95001a67b464fe833b09ebc (diff)
downloadblackbird-op-linux-40f6b36c6243462fb95d0343237331c423494b03.tar.gz
blackbird-op-linux-40f6b36c6243462fb95d0343237331c423494b03.zip
[SCSI] st: add option to use SILI in variable block reads
Add new option MT_ST_SILI to enable setting the SILI bit in reads in variable block mode. If SILI is set, reading a block shorter than the byte count does not result in CHECK CONDITION. The length of the block is determined using the residual count from the HBA. Avoiding the REQUEST SENSE command for every block speeds up some real applications considerably. Signed-off-by: Kai Makisara <kai.makisara@kolumbus.fi> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'Documentation/scsi')
-rw-r--r--Documentation/scsi/st.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/scsi/st.txt b/Documentation/scsi/st.txt
index b7be95b5bd24..38f81188def0 100644
--- a/Documentation/scsi/st.txt
+++ b/Documentation/scsi/st.txt
@@ -2,7 +2,7 @@ This file contains brief information about the SCSI tape driver.
The driver is currently maintained by Kai Mäkisara (email
Kai.Makisara@kolumbus.fi)
-Last modified: Mon Mar 7 21:14:44 2005 by kai.makisara
+Last modified: Thu Feb 21 21:54:16 2008 by kai.makisara
BASICS
@@ -372,6 +372,11 @@ MTSETDRVBUFFER
MT_ST_SYSV sets the SYSV semantics (mode)
MT_ST_NOWAIT enables immediate mode (i.e., don't wait for
the command to finish) for some commands (e.g., rewind)
+ MT_ST_SILI enables setting the SILI bit in SCSI commands when
+ reading in variable block mode to enhance performance when
+ reading blocks shorter than the byte count; set this only
+ if you are sure that the drive supports SILI and the HBA
+ correctly returns transfer residuals
MT_ST_DEBUGGING debugging (global; debugging must be
compiled into the driver)
MT_ST_SETBOOLEANS
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