diff options
Diffstat (limited to 'tests/qemu-iotests/093')
| -rwxr-xr-x | tests/qemu-iotests/093 | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/tests/qemu-iotests/093 b/tests/qemu-iotests/093 new file mode 100755 index 0000000..b9096a5 --- /dev/null +++ b/tests/qemu-iotests/093 @@ -0,0 +1,114 @@ +#!/usr/bin/env python +# +# Tests for IO throttling +# +# Copyright (C) 2015 Red Hat, Inc. +# +# 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://" + + 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().add_drive(self.test_img) + self.vm.launch() + + def tearDown(self): + self.vm.shutdown() + + def do_test_throttle(self, 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 + and num > seconds * limit * 0.9) + + nsec_per_sec = 1000000000 + + params['device'] = 'drive0' + + 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 + wr_nr = max(params['bps'] / rq_size / 2, + params['bps_wr'] / rq_size, + params['iops'] / 2, + params['iops_wr']) + wr_nr *= seconds * 2 + for i in range(rd_nr): + self.vm.hmp_qemu_io("drive0", "aio_read %d %d" % (i * rq_size, rq_size)) + for i in range(wr_nr): + self.vm.hmp_qemu_io("drive0", "aio_write %d %d" % (i * rq_size, rq_size)) + + start_rd_bytes, start_rd_iops, start_wr_bytes, start_wr_iops = self.blockstats('drive0') + + self.vm.qtest("clock_step %d" % ns) + end_rd_bytes, end_rd_iops, end_wr_bytes, end_wr_iops = self.blockstats('drive0') + + rd_bytes = end_rd_bytes - start_rd_bytes + rd_iops = end_rd_iops - start_rd_iops + wr_bytes = end_wr_bytes - start_wr_bytes + wr_iops = end_wr_iops - start_wr_iops + + 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, + } + # 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] + self.do_test_throttle(5, limits) + +class ThrottleTestCoroutine(ThrottleTestCase): + test_img = "null-co://" + +if __name__ == '__main__': + iotests.main(supported_fmts=["raw"]) |