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authorpmikus <pmikus@cisco.com>2016-11-16 14:34:05 +0100
committerPeter Mikus <pmikus@cisco.com>2016-12-13 06:07:28 +0000
commitd7fed63ae2b5d7b3d1f67f572da2d23388f22018 (patch)
tree9cbb2042e9a0338cf4ae7849e3aaf52964a420dc /resources/libraries
parenta17771374e95582aa411147469f14d4e6507ae8b (diff)
CSIT-470 Add option to configure CFS scheduler priority for VPP
Add option to configure CFS scheduler priority for VPP Change-Id: Id358ebe41d7e868fd412d554d886567f81894b86 Signed-off-by: pmikus <pmikus@cisco.com>
Diffstat (limited to 'resources/libraries')
-rw-r--r--resources/libraries/python/SchedUtils.py104
-rw-r--r--resources/libraries/robot/default.robot24
2 files changed, 120 insertions, 8 deletions
diff --git a/resources/libraries/python/SchedUtils.py b/resources/libraries/python/SchedUtils.py
new file mode 100644
index 0000000000..ec18b98dac
--- /dev/null
+++ b/resources/libraries/python/SchedUtils.py
@@ -0,0 +1,104 @@
+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Linux scheduler util library"""
+from resources.libraries.python.ssh import SSH
+
+
+__all__ = ["SchedUtils"]
+
+class SchedUtils(object):
+ """General class for any linux scheduler related methods/functions."""
+
+ @staticmethod
+ def set_vpp_scheduling_rr(node):
+ """Set real-time scheduling attributes of VPP worker threads to
+ SCHED_RR with priority 1.
+
+ :param node: DUT node with running VPP.
+ :type node: dict
+ :raises RuntimeError: Failed to retrieve PID for VPP worker threads.
+ """
+ ssh = SSH()
+ ssh.connect(node)
+
+ cmd = "cat /proc/`pidof vpp`/task/*/stat | grep -i vpp_wk"\
+ " | awk '{print $1}'"
+
+ for _ in range(3):
+ (ret, out, _) = ssh.exec_command_sudo(cmd)
+ if ret == 0:
+ try:
+ if not out:
+ raise ValueError
+ except ValueError:
+ print 'Reading VPP worker thread PID failed.'
+ else:
+ for pid in out.split("\n"):
+ if len(pid) > 0 and pid[0] != "#":
+ SchedUtils.set_proc_scheduling_rr(node, int(pid))
+ break
+ else:
+ raise RuntimeError('Failed to retrieve PID for VPP worker threads.')
+
+ @staticmethod
+ def set_proc_scheduling_rr(node, pid, priority=1):
+ """Set real-time scheduling of a process to SCHED_RR with priority for
+ specified PID.
+
+ :param node: Node where to apply scheduling changes.
+ :param pid: Process ID.
+ :param priority: Realtime priority in range 1-99. Default is 1.
+ :type node: dict
+ :type pid: int
+ :type priority: int
+ :raises ValueError: Parameters out of allowed ranges.
+ :raises RuntimeError: Failed to set policy for PID.
+ """
+ ssh = SSH()
+ ssh.connect(node)
+
+ if pid < 1:
+ raise ValueError("SCHED_RR: PID must be higher then 1.")
+
+ if 1 <= priority <= 99:
+ cmd = "chrt -r -p {0} {1}".format(priority, pid)
+ (ret, _, _) = ssh.exec_command_sudo(cmd)
+ if ret != 0:
+ raise RuntimeError("SCHED_RR: Failed to set policy "\
+ "for PID {0}.".format(pid))
+ else:
+ raise ValueError("SCHED_RR: Priority must be in range 1-99.")
+
+ @staticmethod
+ def set_proc_scheduling_other(node, pid):
+ """Set normal scheduling of a process to SCHED_OTHER for specified PID.
+
+ :param node: Node where to apply scheduling changes.
+ :param pid: Process ID.
+ :type node: dict
+ :type pid: int
+ :raises ValueError: Parameters out of allowed ranges.
+ :raises RuntimeError: Failed to set policy for PID.
+ """
+ ssh = SSH()
+ ssh.connect(node)
+
+ if pid < 1:
+ raise ValueError("SCHED_OTHER: PID must be higher then 1.")
+
+ cmd = "chrt -o -p 0 {1}".format(pid)
+ (ret, _, _) = ssh.exec_command_sudo(cmd)
+ if ret != 0:
+ raise RuntimeError("SCHED_OTHER: Failed to set policy "\
+ "for PID {0}.".format(pid))
diff --git a/resources/libraries/robot/default.robot b/resources/libraries/robot/default.robot
index dca7d53373..85cc4102cc 100644
--- a/resources/libraries/robot/default.robot
+++ b/resources/libraries/robot/default.robot
@@ -16,6 +16,7 @@
| Library | resources.libraries.python.topology.Topology
| Library | resources.libraries.python.CpuUtils
| Library | resources.libraries.python.DUTSetup
+| Library | resources.libraries.python.SchedUtils
| Library | resources.libraries.python.TGSetup
| Library | resources/libraries/python/VppConfigGenerator.py
| Library | resources/libraries/python/VppCounters.py
@@ -23,27 +24,27 @@
*** Keywords ***
| Setup all DUTs before test
-| | [Documentation] | Setup all DUTs in topology before test execution
+| | [Documentation] | Setup all DUTs in topology before test execution.
| | Setup All DUTs | ${nodes}
| Setup all TGs before traffic script
-| | [Documentation] | Prepare all TGs before traffic scripts execution
+| | [Documentation] | Prepare all TGs before traffic scripts execution.
| | All TGs Set Interface Default Driver | ${nodes}
-| Show vpp version on all DUTs
-| | [Documentation] | Show VPP version verbose on all DUTs
+| Show Vpp Version On All DUTs
+| | [Documentation] | Show VPP version verbose on all DUTs.
| | ${duts}= | Get Matches | ${nodes} | DUT*
| | :FOR | ${dut} | IN | @{duts}
| | | Vpp show version verbose | ${nodes['${dut}']}
-| Show Vpp Errors on All DUTs
-| | [Documentation] | Show VPP errors verbose on all DUTs
+| Show Vpp Errors On All DUTs
+| | [Documentation] | Show VPP errors verbose on all DUTs.
| | ${duts}= | Get Matches | ${nodes} | DUT*
| | :FOR | ${dut} | IN | @{duts}
| | | Vpp Show Errors | ${nodes['${dut}']}
-| Show vpp trace dump on all DUTs
-| | [Documentation] | Save API trace and dump output on all DUTs
+| Show Vpp Trace Dump On All DUTs
+| | [Documentation] | Save API trace and dump output on all DUTs.
| | ${duts}= | Get Matches | ${nodes} | DUT*
| | :FOR | ${dut} | IN | @{duts}
| | | Vpp api trace save | ${nodes['${dut}']}
@@ -55,6 +56,13 @@
| | :FOR | ${dut} | IN | @{duts}
| | | Vpp Show Vhost | ${nodes['${dut}']}
+| Setup Scheduler Policy for Vpp On All DUTs
+| | [Documentation] | Set realtime scheduling policy (SCHED_RR) with priority 1
+| | ... | on all VPP worker threads on all DUTs.
+| | ${duts}= | Get Matches | ${nodes} | DUT*
+| | :FOR | ${dut} | IN | @{duts}
+| | | Set VPP Scheduling rr | ${nodes['${dut}']}
+
| Add '${m}' worker threads and rxqueues '${n}' in 3-node single-link topo
| | [Documentation] | Setup M worker threads and N rxqueues in vpp startup
| | ... | configuration on all DUTs in 3-node single-link topology.