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tests: Increase rate limiter refill time

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The rate limiter token bucket has a fixed 100 ms cool down time
that pauses I/O whenever the bucket empties. With a 100 ms refill
time, the actual throughput drops to roughly half of the target
rate and causes the tests to miss their target.

Increase the net and single block refill time from 100 ms to
1000 ms and scale the bucket sizes by 10x to preserve the target
rate. Set the one time burst to 0 to avoid overshooting the upper
bound, and raise the runtime constants from 10 s to 20 s for
steadier measurements.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-03-30 11:43:32 +02:00
committed by Rob Bradford
parent 6de3d5279f
commit f116038111
1 changed files with 10 additions and 10 deletions
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20
cloud-hypervisor/tests/integration.rs
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@@ -10475,8 +10475,8 @@ mod aarch64_acpi {
mod rate_limiter {
use super::*;
const NET_RATE_LIMITER_RUNTIME: u32 = 10;
const BLOCK_RATE_LIMITER_RUNTIME: u32 = 10;
const NET_RATE_LIMITER_RUNTIME: u32 = 20;
const BLOCK_RATE_LIMITER_RUNTIME: u32 = 20;
// Check if the 'measured' rate is within the expected 'difference' (in percentage)
// compared to given 'limit' rate.
@@ -10503,12 +10503,12 @@ mod rate_limiter {
let num_queues = 2;
let queue_size = 256;
let bw_size = 10485760_u64; // bytes
let bw_refill_time = 100; // ms
let bw_size = 104857600_u64; // bytes
let bw_refill_time = 1000; // ms
let limit_bps = (bw_size * 8 * 1000) as f64 / bw_refill_time as f64;
let net_params = format!(
"tap=,mac={},ip={},mask=255.255.255.128,num_queues={},queue_size={},bw_size={},bw_refill_time={}",
"tap=,mac={},ip={},mask=255.255.255.128,num_queues={},queue_size={},bw_size={},bw_one_time_burst=0,bw_refill_time={}",
guest.network.guest_mac0,
guest.network.host_ip0,
num_queues,
@@ -10560,11 +10560,11 @@ mod rate_limiter {
let fio_ops = FioOps::RandRW;
let bw_size = if bandwidth {
10485760_u64 // bytes
104857600_u64 // bytes
} else {
100_u64 // I/O
1000_u64 // I/O
};
let bw_refill_time = 100; // ms
let bw_refill_time = 1000; // ms
let limit_rate = (bw_size * 1000) as f64 / bw_refill_time as f64;
let disk_config = UbuntuDiskConfig::new(JAMMY_IMAGE_NAME.to_string());
@@ -10585,11 +10585,11 @@ mod rate_limiter {
let test_blk_params = if bandwidth {
format!(
"path={blk_rate_limiter_test_img},num_queues={num_queues},bw_size={bw_size},bw_refill_time={bw_refill_time},image_type=raw"
"path={blk_rate_limiter_test_img},num_queues={num_queues},bw_size={bw_size},bw_one_time_burst=0,bw_refill_time={bw_refill_time},image_type=raw"
)
} else {
format!(
"path={blk_rate_limiter_test_img},num_queues={num_queues},ops_size={bw_size},ops_refill_time={bw_refill_time},image_type=raw"
"path={blk_rate_limiter_test_img},num_queues={num_queues},ops_size={bw_size},ops_one_time_burst=0,ops_refill_time={bw_refill_time},image_type=raw"
)
};