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performance-metrics: Add QCOW2 read micro benchmark

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Add micro_bench_qcow_read which times read_vectored calls through
QcowSync on a prepopulated QCOW2 image. This exercises the hot
read path including L2 lookup, pread64 for allocated clusters and
iovec scatter.

Two TEST_LIST entries: micro_block_qcow_read_128_us and
micro_block_qcow_read_256_us with 128 and 256 cluster workloads.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-03-26 20:15:10 +01:00
committed by Rob Bradford
parent beaa98728c
commit 6cd3395a55
2 changed files with 54 additions and 2 deletions
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26
performance-metrics/src/main.rs
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@@ -378,7 +378,7 @@ mod adjuster {
}
}
const TEST_LIST: [PerformanceTest; 62] = [
const TEST_LIST: [PerformanceTest; 64] = [
PerformanceTest {
name: "boot_time_ms",
func_ptr: performance_boot_time,
@@ -1253,6 +1253,30 @@ const TEST_LIST: [PerformanceTest; 62] = [
},
unit_adjuster: adjuster::s_to_us,
},
PerformanceTest {
name: "micro_block_qcow_read_128_us",
func_ptr: micro_bench_block::micro_bench_qcow_read,
control: PerformanceTestControl {
test_timeout: 10,
test_iterations: 20,
warmup_iterations: 5,
num_ops: Some(128),
..PerformanceTestControl::default()
},
unit_adjuster: adjuster::s_to_us,
},
PerformanceTest {
name: "micro_block_qcow_read_256_us",
func_ptr: micro_bench_block::micro_bench_qcow_read,
control: PerformanceTestControl {
test_timeout: 10,
test_iterations: 20,
warmup_iterations: 5,
num_ops: Some(256),
..PerformanceTestControl::default()
},
unit_adjuster: adjuster::s_to_us,
},
];
fn run_test_with_timeout(