IntP - Application Interference Measurement Tool

SystemTap-based tool for measuring application interference in Linux systems

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🚀 Quick Start

Consumer CPUs (Intel Core i5/i7/i9, AMD)

cd ~/Documents/intp

# Run IntP (6 out of 7 metrics functional)
sudo stap -g -B CONFIG_MODVERSIONS=y intp-6.8.stp firefox

# View metrics in another terminal
watch -n2 -d cat /proc/systemtap/stap_*/intestbench

Intel Xeon CPUs (with RDT support)

# Start LLC monitoring helper
./intp-resctrl-helper.sh start

# Run IntP (all 7 metrics functional)
sudo stap -g -B CONFIG_MODVERSIONS=y intp-resctrl.stp firefox

# View metrics
watch -n2 -d cat /proc/systemtap/stap_*/intestbench

# Stop helper when done
./intp-resctrl-helper.sh stop

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📊 Metrics Measured

Metric	Acronym	Description	Consumer CPUs	Xeon with RDT
Network Physical	netp	Network layer utilization	✅	✅
Network Stack	nets	Network stack utilization	✅	✅
Block I/O	blk	Disk I/O utilization	✅	✅
Memory Bandwidth	mbw	Memory bandwidth usage	✅	✅
LLC Miss Ratio	llcmr	Cache miss percentage	✅	✅
LLC Occupancy	llcocc	Cache occupancy	❌ (0)	✅
CPU Utilization	cpu	CPU usage percentage	✅	✅

Example Output:

netp    nets    blk     mbw     llcmr   llcocc  cpu
02      01      05      12      03      00      45

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🔄 What Changed for Kernel 6.8.0

Component	Original (≤6.6)	Kernel 6.8.0+	Reason
MSR Definitions	Defined in script	Removed	Now in kernel headers
LLC Occupancy	perf events (cqm_rmid)	resctrl filesystem	API removed from kernel
Module Loading	stap -g	stap -g -B CONFIG_MODVERSIONS=y	MODVERSIONS enforced
SystemTap Version	4.9-5.0 (package)	5.2+ (source)	Kernel 6.8 compatibility

New Files:

• intp-6.8.stp - Patched for 6.8.0 (LLC disabled)
• intp-resctrl.stp - Full version with resctrl
• intp-resctrl-helper.sh - LLC monitoring daemon

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📖 Documentation

Document	Description
Installation Guide	Complete Ubuntu 24.04 setup
Quick Fix: Module Loading	Solve "Invalid module format"
Kernel Changes	API compatibility details
LLC Monitoring	resctrl implementation
Complete Summary	Full project overview

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🛠️ Installation (Quick Version)

1. Build SystemTap 5.2

sudo apt install -y build-essential git libdw-dev libelf-dev
cd ~/Documents && git clone https://sourceware.org/git/systemtap.git
cd systemtap && git checkout release-5.2
./configure --prefix=/usr/local --disable-docs && make -j$(nproc)
sudo make install

2. Install Debug Symbols

sudo apt install -y ubuntu-dbgsym-keyring
echo "deb http://ddebs.ubuntu.com noble main restricted universe multiverse" | sudo tee /etc/apt/sources.list.d/ddebs.list
sudo apt update && sudo apt install -y linux-image-$(uname -r)-dbgsym

3. Test

sudo stap -g -B CONFIG_MODVERSIONS=y -e 'probe begin { printf("OK\n") exit() }'

Full guide: install/install_ubuntu24_desktop.md

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🐛 Common Issues

"Invalid module format"

# Add -B CONFIG_MODVERSIONS=y
sudo stap -g -B CONFIG_MODVERSIONS=y intp-6.8.stp firefox

"MSR redefined" or "cqm_rmid" errors

# Use patched version
sudo stap -g -B CONFIG_MODVERSIONS=y intp-6.8.stp firefox

LLC Occupancy = 0

• Consumer CPUs: Expected (no RDT support)
• Xeon CPUs: Use intp-resctrl.stp + helper daemon

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🤝 Credits

Original IntP: @mclsylva, @superflit
Kernel 6.8.0 Adaptation: Project contributors

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Kernel: 6.8.0-90 | SystemTap: 5.2 | Updated: Jan 2026