40ed108dd5
KVM-based microVMM for the Volt platform: - Sub-second VM boot times - Minimal memory footprint - Landlock LSM + seccomp security - Virtio device support - Custom kernel management Copyright (c) Armored Gates LLC. All rights reserved. Licensed under AGPSL v5.0
159 lines
3.7 KiB
Markdown
159 lines
3.7 KiB
Markdown
# Volt Network Benchmarks
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Comprehensive benchmark suite for comparing network backend performance in Volt VMs.
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## Quick Start
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```bash
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# Install dependencies (run once on each test machine)
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./setup.sh
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# Run full benchmark suite
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./run-all.sh <server-ip> <backend-name>
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# Or run individual tests
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./throughput.sh <server-ip> <backend-name>
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./latency.sh <server-ip> <backend-name>
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./pps.sh <server-ip> <backend-name>
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```
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## Test Architecture
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```
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┌─────────────────┐ ┌─────────────────┐
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│ Client VM │ │ Server VM │
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│ (runs tests) │◄───────►│ (runs servers) │
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│ │ │ │
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│ ./throughput.sh│ │ iperf3 -s │
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│ ./latency.sh │ │ sockperf sr │
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│ ./pps.sh │ │ netserver │
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└─────────────────┘ └─────────────────┘
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```
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## Backends Tested
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| Backend | Description | Expected Performance |
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|---------|-------------|---------------------|
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| `virtio` | Pure virtio-net (QEMU userspace) | Baseline |
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| `vhost-net` | vhost-net kernel acceleration | ~2-3x throughput |
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| `macvtap` | Direct host NIC passthrough | Near line-rate |
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## Running Benchmarks
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### Prerequisites
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1. Two VMs with network connectivity
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2. Root/sudo access on both
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3. Firewall rules allowing test traffic
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### Server Setup
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On the server VM, start the test servers:
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```bash
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# iperf3 server (TCP/UDP throughput)
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iperf3 -s -D
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# sockperf server (latency)
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sockperf sr --daemonize
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# netperf server (PPS)
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netserver
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```
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### Client Tests
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```bash
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# Test with virtio backend
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./run-all.sh 192.168.1.100 virtio
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# Test with vhost-net backend
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./run-all.sh 192.168.1.100 vhost-net
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# Test with macvtap backend
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./run-all.sh 192.168.1.100 macvtap
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```
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### Comparison
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After running tests with all backends:
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```bash
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./compare.sh results/
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```
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## Output
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Results are saved to `results/<backend>/<timestamp>/`:
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```
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results/
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├── virtio/
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│ └── 2024-01-15_143022/
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│ ├── throughput.json
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│ ├── latency.txt
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│ └── pps.txt
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├── vhost-net/
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│ └── ...
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└── macvtap/
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└── ...
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```
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## Test Details
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### Throughput Tests (`throughput.sh`)
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| Test | Tool | Command | Metric |
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|------|------|---------|--------|
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| TCP Single | iperf3 | `-c <ip> -t 30` | Gbps |
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| TCP Multi-8 | iperf3 | `-c <ip> -P 8 -t 30` | Gbps |
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| UDP Max | iperf3 | `-c <ip> -u -b 0 -t 30` | Gbps, Loss% |
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### Latency Tests (`latency.sh`)
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| Test | Tool | Command | Metric |
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|------|------|---------|--------|
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| ICMP Ping | ping | `-c 1000 -i 0.01` | avg/p50/p95/p99 µs |
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| TCP Latency | sockperf | `pp -i <ip> -t 30` | avg/p50/p95/p99 µs |
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### PPS Tests (`pps.sh`)
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| Test | Tool | Command | Metric |
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|------|------|---------|--------|
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| 64-byte UDP | iperf3 | `-u -l 64 -b 0` | packets/sec |
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| TCP RR | netperf | `TCP_RR -l 30` | trans/sec |
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## Interpreting Results
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### What to Look For
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1. **Throughput**: vhost-net should be 2-3x virtio, macvtap near line-rate
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2. **Latency**: macvtap lowest, vhost-net middle, virtio highest
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3. **PPS**: Best indicator of CPU overhead per packet
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### Red Flags
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- TCP throughput < 1 Gbps on 10G link → Check offloading
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- Latency P99 > 10x P50 → Indicates jitter issues
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- UDP loss > 1% → Buffer tuning needed
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## Troubleshooting
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### iperf3 connection refused
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```bash
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# Ensure server is running
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ss -tlnp | grep 5201
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```
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### sockperf not found
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```bash
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# Rebuild with dependencies
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./setup.sh
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```
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### Inconsistent results
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```bash
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# Disable CPU frequency scaling
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echo performance | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
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```
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