diff options
Diffstat (limited to 'qemu/tests/qemu-iotests/093')
| -rwxr-xr-x | qemu/tests/qemu-iotests/093 | 65 |
1 files changed, 51 insertions, 14 deletions
diff --git a/qemu/tests/qemu-iotests/093 b/qemu/tests/qemu-iotests/093 index c0e9e2b0b..ce8e13cb4 100755 --- a/qemu/tests/qemu-iotests/093 +++ b/qemu/tests/qemu-iotests/093 @@ -3,7 +3,7 @@ # Tests for IO throttling # # Copyright (C) 2015 Red Hat, Inc. -# Copyright (C) 2015 Igalia, S.L. +# Copyright (C) 2015-2016 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 @@ -21,6 +21,8 @@ import iotests +nsec_per_sec = 1000000000 + class ThrottleTestCase(iotests.QMPTestCase): test_img = "null-aio://" max_drives = 3 @@ -42,16 +44,7 @@ class ThrottleTestCase(iotests.QMPTestCase): 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 - + def configure_throttle(self, ndrives, params): params['group'] = 'test' # Set the I/O throttling parameters to all drives @@ -60,13 +53,21 @@ class ThrottleTestCase(iotests.QMPTestCase): result = self.vm.qmp("block_set_io_throttle", conv_keys=False, **params) self.assert_qmp(result, 'return', {}) + 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) + # 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 + # Submit enough requests so the throttling mechanism kicks + # in. The throttled requests won't be executed until we + # advance the virtual clock. rq_size = 512 rd_nr = max(params['bps'] / rq_size / 2, params['bps_rd'] / rq_size, @@ -142,8 +143,44 @@ class ThrottleTestCase(iotests.QMPTestCase): for tk in params: limits = dict([(k, 0) for k in params]) limits[tk] = params[tk] * ndrives + self.configure_throttle(ndrives, limits) self.do_test_throttle(ndrives, 5, limits) + def test_burst(self): + params = {"bps": 4096, + "bps_rd": 4096, + "bps_wr": 4096, + "iops": 10, + "iops_rd": 10, + "iops_wr": 10, + } + ndrives = 1 + # Pick each out of all possible params and test + for tk in params: + rate = params[tk] * ndrives + burst_rate = rate * 7 + burst_length = 4 + + # Configure the throttling settings + settings = dict([(k, 0) for k in params]) + settings[tk] = rate + settings['%s_max' % tk] = burst_rate + settings['%s_max_length' % tk] = burst_length + self.configure_throttle(ndrives, settings) + + # Wait for the bucket to empty so we can do bursts + wait_ns = nsec_per_sec * burst_length * burst_rate / rate + self.vm.qtest("clock_step %d" % wait_ns) + + # Test I/O at the max burst rate + limits = dict([(k, 0) for k in params]) + limits[tk] = burst_rate + self.do_test_throttle(ndrives, burst_length, limits) + + # Now test I/O at the normal rate + limits[tk] = rate + self.do_test_throttle(ndrives, 5, limits) + class ThrottleTestCoroutine(ThrottleTestCase): test_img = "null-co://" |