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qemu-iotests: Test I/O in a single drive from a throttling group 

iotest 093 contains a test that creates a throttling group with
several drives and performs I/O in all of them. This patch adds a new
test that creates a similar setup but only performs I/O in one of the
drives at the same time.

This is useful to test that the round robin algorithm is behaving
properly in these scenarios, and is specifically written using the
regression introduced in 27ccdd5259 as an example.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2016-10-17 18:46:03 +03:00 committed by Kevin Wolf
parent 6bf77e1c2d
commit a26ddb4396
2 changed files with 30 additions and 7 deletions
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33
tests/qemu-iotests/093
View File

@ -53,7 +53,7 @@ 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 do_test_throttle(self, ndrives, seconds, params, first_drive = 0):
def check_limit(limit, num):
# IO throttling algorithm is discrete, allow 10% error so the test
# is more robust
@ -85,12 +85,14 @@ class ThrottleTestCase(iotests.QMPTestCase):
# 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" %
idx = first_drive + drive
self.vm.hmp_qemu_io("drive%d" % idx, "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" %
idx = first_drive + drive
self.vm.hmp_qemu_io("drive%d" % idx, "aio_write %d %d" %
(i * rq_size, rq_size))
# We'll store the I/O stats for each drive in these arrays
@ -105,15 +107,17 @@ class ThrottleTestCase(iotests.QMPTestCase):
# Read the stats before advancing the clock
for i in range(0, ndrives):
idx = first_drive + i
start_rd_bytes[i], start_rd_iops[i], start_wr_bytes[i], \
start_wr_iops[i] = self.blockstats('drive%d' % i)
start_wr_iops[i] = self.blockstats('drive%d' % idx)
self.vm.qtest("clock_step %d" % ns)
# Read the stats after advancing the clock
for i in range(0, ndrives):
idx = first_drive + i
end_rd_bytes[i], end_rd_iops[i], end_wr_bytes[i], \
end_wr_iops[i] = self.blockstats('drive%d' % i)
end_wr_iops[i] = self.blockstats('drive%d' % idx)
# Check that the I/O is within the limits and evenly distributed
for i in range(0, ndrives):
@ -129,6 +133,7 @@ class ThrottleTestCase(iotests.QMPTestCase):
self.assertTrue(check_limit(params['iops_rd'], rd_iops))
self.assertTrue(check_limit(params['iops_wr'], wr_iops))
# Connect N drives to a VM and test I/O in all of them
def test_all(self):
params = {"bps": 4096,
"bps_rd": 4096,
@ -146,6 +151,24 @@ class ThrottleTestCase(iotests.QMPTestCase):
self.configure_throttle(ndrives, limits)
self.do_test_throttle(ndrives, 5, limits)
# Connect N drives to a VM and test I/O in just one of them a time
def test_one(self):
params = {"bps": 4096,
"bps_rd": 4096,
"bps_wr": 4096,
"iops": 10,
"iops_rd": 10,
"iops_wr": 10,
}
# Repeat the test for each one of the drives
for drive in range(0, self.max_drives):
# 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.max_drives
self.configure_throttle(self.max_drives, limits)
self.do_test_throttle(1, 5, limits, drive)
def test_burst(self):
params = {"bps": 4096,
"bps_rd": 4096,

4
tests/qemu-iotests/093.out
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@ -1,5 +1,5 @@
.....
.......
----------------------------------------------------------------------
Ran 5 tests
Ran 7 tests
OK