--- /dev/null
+#!/usr/bin/env python
+#
+# Tests for IO throttling
+#
+# Copyright (C) 2015 Red Hat, Inc.
+# Copyright (C) 2015 Igalia, S.L.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+import iotests
+
+class ThrottleTestCase(iotests.QMPTestCase):
+ test_img = "null-aio://"
+ max_drives = 3
+
+ def blockstats(self, device):
+ result = self.vm.qmp("query-blockstats")
+ for r in result['return']:
+ if r['device'] == device:
+ stat = r['stats']
+ return stat['rd_bytes'], stat['rd_operations'], stat['wr_bytes'], stat['wr_operations']
+ raise Exception("Device not found for blockstats: %s" % device)
+
+ def setUp(self):
+ self.vm = iotests.VM()
+ for i in range(0, self.max_drives):
+ self.vm.add_drive(self.test_img)
+ self.vm.launch()
+
+ def tearDown(self):
+ self.vm.shutdown()
+
+ def do_test_throttle(self, ndrives, seconds, params):
+ def check_limit(limit, num):
+ # IO throttling algorithm is discrete, allow 10% error so the test
+ # is more robust
+ return limit == 0 or \
+ (num < seconds * limit * 1.1 / ndrives
+ and num > seconds * limit * 0.9 / ndrives)
+
+ nsec_per_sec = 1000000000
+
+ params['group'] = 'test'
+
+ # Set the I/O throttling parameters to all drives
+ for i in range(0, ndrives):
+ params['device'] = 'drive%d' % i
+ result = self.vm.qmp("block_set_io_throttle", conv_keys=False, **params)
+ self.assert_qmp(result, 'return', {})
+
+ # Set vm clock to a known value
+ ns = seconds * nsec_per_sec
+ self.vm.qtest("clock_step %d" % ns)
+
+ # Submit enough requests. They will drain bps_max and iops_max, but the
+ # rest requests won't get executed until we advance the virtual clock
+ # with qtest interface
+ rq_size = 512
+ rd_nr = max(params['bps'] / rq_size / 2,
+ params['bps_rd'] / rq_size,
+ params['iops'] / 2,
+ params['iops_rd'])
+ rd_nr *= seconds * 2
+ rd_nr /= ndrives
+ wr_nr = max(params['bps'] / rq_size / 2,
+ params['bps_wr'] / rq_size,
+ params['iops'] / 2,
+ params['iops_wr'])
+ wr_nr *= seconds * 2
+ wr_nr /= ndrives
+
+ # Send I/O requests to all drives
+ for i in range(rd_nr):
+ for drive in range(0, ndrives):
+ self.vm.hmp_qemu_io("drive%d" % drive, "aio_read %d %d" %
+ (i * rq_size, rq_size))
+
+ for i in range(wr_nr):
+ for drive in range(0, ndrives):
+ self.vm.hmp_qemu_io("drive%d" % drive, "aio_write %d %d" %
+ (i * rq_size, rq_size))
+
+ # We'll store the I/O stats for each drive in these arrays
+ start_rd_bytes = [0] * ndrives
+ start_rd_iops = [0] * ndrives
+ start_wr_bytes = [0] * ndrives
+ start_wr_iops = [0] * ndrives
+ end_rd_bytes = [0] * ndrives
+ end_rd_iops = [0] * ndrives
+ end_wr_bytes = [0] * ndrives
+ end_wr_iops = [0] * ndrives
+
+ # Read the stats before advancing the clock
+ for i in range(0, ndrives):
+ start_rd_bytes[i], start_rd_iops[i], start_wr_bytes[i], \
+ start_wr_iops[i] = self.blockstats('drive%d' % i)
+
+ self.vm.qtest("clock_step %d" % ns)
+
+ # Read the stats after advancing the clock
+ for i in range(0, ndrives):
+ end_rd_bytes[i], end_rd_iops[i], end_wr_bytes[i], \
+ end_wr_iops[i] = self.blockstats('drive%d' % i)
+
+ # Check that the I/O is within the limits and evenly distributed
+ for i in range(0, ndrives):
+ rd_bytes = end_rd_bytes[i] - start_rd_bytes[i]
+ rd_iops = end_rd_iops[i] - start_rd_iops[i]
+ wr_bytes = end_wr_bytes[i] - start_wr_bytes[i]
+ wr_iops = end_wr_iops[i] - start_wr_iops[i]
+
+ self.assertTrue(check_limit(params['bps'], rd_bytes + wr_bytes))
+ self.assertTrue(check_limit(params['bps_rd'], rd_bytes))
+ self.assertTrue(check_limit(params['bps_wr'], wr_bytes))
+ self.assertTrue(check_limit(params['iops'], rd_iops + wr_iops))
+ self.assertTrue(check_limit(params['iops_rd'], rd_iops))
+ self.assertTrue(check_limit(params['iops_wr'], wr_iops))
+
+ def test_all(self):
+ params = {"bps": 4096,
+ "bps_rd": 4096,
+ "bps_wr": 4096,
+ "iops": 10,
+ "iops_rd": 10,
+ "iops_wr": 10,
+ }
+ # Repeat the test with different numbers of drives
+ for ndrives in range(1, self.max_drives + 1):
+ # Pick each out of all possible params and test
+ for tk in params:
+ limits = dict([(k, 0) for k in params])
+ limits[tk] = params[tk] * ndrives
+ self.do_test_throttle(ndrives, 5, limits)
+
+class ThrottleTestCoroutine(ThrottleTestCase):
+ test_img = "null-co://"
+
+if __name__ == '__main__':
+ iotests.main(supported_fmts=["raw"])
Code Review / kvmfornfv.git / blobdiff