[stgt] [PATCH 0/2] Add MaxQueueCmd

Shlomo Pongratz shlomop at mellanox.com
Thu Aug 8 15:03:34 CEST 2013

This patch series does two things.

The first patch is a restructuring patch that makes it easy to configure tgtd local parameters via tgtadm.
Local parmeters in this context are parameters that are not sent to the initiator.
Currently there is one such parameter i.e. MaxXmitDataSegmentLength.

The second patch makes use of the first one in order to add a new parameter named MaxQueueCmd.
The value of this parameter varies between 1 and 512, and is default value is set to 128 in order to keep backward compatibility.
The need for the 2nd patch raised when running tgt against optimized iser initiators,
where the hard-coded value of 128 in-flight command become a bottleneck for the maximal number of IOPS.
Once addressed we were able to get decent improvement.

Shlomo Pongratz (2):
  Enable more iscsi local params
  Add MaxQueueCmd iscsi local parameter

 usr/iscsi/iscsi_if.h  |    5 ++++-
 usr/iscsi/iscsid.c    |   26 +++++++++++++++-----------
 usr/iscsi/iscsid.h    |    5 +++++
 usr/iscsi/iser.c      |   15 ++++++++-------
 usr/iscsi/iser_text.c |    4 ++--
 usr/iscsi/param.c     |    8 ++++++--
 usr/iscsi/session.c   |    2 ++
 usr/iscsi/target.c    |    4 +++-
 8 files changed, 45 insertions(+), 24 deletions(-)

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