From 13049537007dee73a76f0a30fcbc24d02c6fa9e4 Mon Sep 17 00:00:00 2001 From: Joseph Handzik Date: Mon, 8 Aug 2011 11:40:15 +0200 Subject: cciss: Adds simple mode functionality Signed-off-by: Joseph Handzik Acked-by: Stephen M. Cameron Signed-off-by: Jens Axboe --- Documentation/blockdev/cciss.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'Documentation') diff --git a/Documentation/blockdev/cciss.txt b/Documentation/blockdev/cciss.txt index c00c6a5..71464e0 100644 --- 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 ------------------------------------------ -- cgit v1.1 From f963d270cb7bbb8eeb57901d02b22a493e664fd2 Mon Sep 17 00:00:00 2001 From: Joe Handzik Date: Mon, 8 Aug 2011 11:40:17 +0200 Subject: cciss: add transport mode attribute to sys Signed-off-by: Joseph Handzik Acked-by: Stephen M. Cameron Signed-off-by: Jens Axboe --- Documentation/ABI/testing/sysfs-bus-pci-devices-cciss | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'Documentation') diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss index f5bb0a3..53d99ed 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss +++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss @@ -71,3 +71,10 @@ Description: Value of 1 indicates the controller can honor the reset_devices a dump device, as kdump requires resetting the device in order to work reliably. +Where: /sys/bus/pci/devices//ccissX/transport_mode +Date: July 2011 +Kernel Version: 3.0 +Contact: iss_storagedev@hp.com +Description: Value of "simple" indicates that the controller has been placed + in "simple mode". Value of "performant" indicates that the + controller has been placed in "performant mode". -- cgit v1.1