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performance-metrics: Add QCOW2 L2 cache cold miss micro benchmark

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Add micro_bench_qcow_l2_cache_miss which reads one cluster from each
of num_ops distinct L2 tables in a sparsely allocated image.  Clusters
are spaced L2_ENTRIES_PER_TABLE apart so every read touches a different
L2 table, forcing eviction when num_ops exceeds the cache capacity.

Workloads: 128 and 256 L2 tables.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-03-26 23:03:38 +01:00
committed by Rob Bradford
parent 73d99c044c
commit faf6f7b635
2 changed files with 54 additions and 3 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; 80] = [
const TEST_LIST: [PerformanceTest; 82] = [
PerformanceTest {
name: "boot_time_ms",
func_ptr: performance_boot_time,
@@ -1469,6 +1469,30 @@ const TEST_LIST: [PerformanceTest; 80] = [
},
unit_adjuster: adjuster::s_to_us,
},
PerformanceTest {
name: "micro_block_qcow_l2_cache_miss_128_us",
func_ptr: micro_bench_block::micro_bench_qcow_l2_cache_miss,
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_l2_cache_miss_256_us",
func_ptr: micro_bench_block::micro_bench_qcow_l2_cache_miss,
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(