Proxmox VE

Proxmox VE Performance Guide

2 min read

Proxmox VE Performance Guide

Table of Contents

  1. CPU Performance
  2. Memory Performance
  3. Storage Performance
  4. Network Performance
  5. VM Optimization
  6. Container Optimization

CPU Performance

CPU Modes

# Host passthrough
qm set <vmid> --cpu host
 
# Emulated
qm set <vmid> --cpu x86-64v2
 
# CPU pinning
qm set <vmid> --cores 2 --cpuset 0-1

NUMA

# Enable NUMA
qm set <vmid> --numa 1
 
# Configure NUMA
qm set <vmid> --numa 1 --numa0 memory=4096,cpus=0-1

Memory Performance

Huge Pages

# Enable huge pages
qm set <vmid> --hugepages 1024
 
# Configure huge pages
echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages

Memory Ballooning

# Enable balloon
qm set <vmid> --balloon 2048
 
# Disable balloon (performance critical)
qm set <vmid> --balloon 0

Storage Performance

I/O Thread

# Enable I/O thread
qm set <vmid> --scsi0 local:,iothread=1

Cache Modes

# None (fastest)
qm set <vmid> --scsi0 local:,cache=none
 
# Write-through (safe)
qm set <vmid> --scsi0 local:,cache=writethrough
 
# Write-back (fast)
qm set <vmid> --scsi0 local:,cache=writeback

Discard

# Enable discard
qm set <vmid> --scsi0 local:,discard=1,ssd=1

Network Performance

VirtIO

# Use VirtIO
qm set <vmid> --net0 virtio,bridge=vmbr0

Multi-Queue

# Enable multi-queue
qm set <vmid> --net0 virtio,bridge=vmbr0,queues=4

Interrupt Coalescing

# Tune network
ethtool -C eth0 rx-usecs 100 tx-usecs 100

VM Optimization Checklist

  • Use VirtIO drivers
  • Enable I/O thread
  • Enable multi-queue
  • Disable balloon for critical VMs
  • Use host CPU
  • Enable huge pages
  • Pin CPUs

Keywords

performance optimization tuning cpu memory storage network

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