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Bunch of utils to simplify linux network troubleshooting and performance tuning.

Project description

netutils-linux

https://travis-ci.org/strizhechenko/netutils-linux.svg?branch=master

It’s a useful utils to simplify Linux network troubleshooting and performance tuning, developed in order to help Carbon Reductor techsupport and automate the whole linux performance tuning process out of box (ok, except the best RSS layout detection). It’s now in production usage with 300+ deployment and save us a lot of time with hardware and software settings debugging.

Installation

pip install netutils-linux

Utils

irqtop

  • Show you a rate of interrupts

  • based on /proc/interrupts file

  • Hides the interrupts with small rate to show a better picture.

Example output:

Total:    1398        1539
          CPU0    CPU1
22:       233     227     IO-APIC-fasteoi     eth1
28:       91      98      PCI-MSI-edge        eth0
LOC:      1021        1035    Local   timer   interrupts
CAL:      48      172     Function    call    interrupts

softirq-net-rx-top

  • Show you a rate of receiving packets

  • Based on /proc/softirqs

  • Sometimes shows much more CPUs than really exists

Example output:

11.22, 11.20, 7.90
1     2897
2     2552
3     0
4     0

11.29, 11.21, 7.93
1     2182
2     2814
3     0
4     0

missed-pkts-monitor

  • Detects when were packets missed (maybe it will give some idea of correlation with something)

  • Easy to use in tactical, not strategic debug, without deployment of graphite/influxdb

  • Based on ip -s -s link output

rss-ladder

Automatically set smp_affinity_list for IRQ of NIC rx/tx queues for ixgbe/igb/vmxnet3 drivers (they usually work on CPU0 out of the box).

Based on lscpu’s output.

It also supports double/quad ladder in case of multiprocessor systems (but you better explicitly specify queue count == core per socket as NIC’s driver’s param).

# rss-ladder eth1 0
- Распределение прерываний eth1 (-TxRx-) на сокете 0
  - eth1: irq 67 eth1-TxRx-0 -> 0
  - eth1: irq 68 eth1-TxRx-1 -> 1
  - eth1: irq 69 eth1-TxRx-2 -> 2
  - eth1: irq 70 eth1-TxRx-3 -> 3
  - eth1: irq 71 eth1-TxRx-4 -> 8
  - eth1: irq 72 eth1-TxRx-5 -> 9
  - eth1: irq 73 eth1-TxRx-6 -> 10
  - eth1: irq 74 eth1-TxRx-7 -> 11

autorps

Enables RPS of NIC on all available CPUs. It may be good for small servers with cheap network cards or a bunch of VLAN.

Later, there will be a support for enabling RPS only for a subgroup of CPUs based on L3 caches.

maximize-cpu-freq

Sets every CPU scaling governor mode to performance and set max scaling value for min scaling value. So you will be able to use all power of your processor (useful for latency sensible systems).

rx-buffers-increase

rx-buffers-increase utils, that finds and sets compromise-value between avoiding dropped/missing pkts and keeping a latency low.

Example output:

# ethtool -g eth1

Ring parameters for eth1:
Pre-set maximums:
RX:           4096
RX Mini:      0
RX Jumbo:     0
TX:           4096
Current hardware settings:
RX:           256
RX Mini:      0
RX Jumbo:     0
TX:           256

# rx-buffers-increase eth1

run: ethtool -G eth1 rx 2048

# rx-buffers-increase eth1

eth1's rx ring buffer already has fine size.

# ethtool -g eth1

Ring parameters for eth1:
Pre-set maximums:
RX:           4096
RX Mini:      0
RX Jumbo:     0
TX:           4096
Current hardware settings:
RX:           2048
RX Mini:      0
RX Jumbo:     0
TX:           256

server-info

Much alike lshw but designed for network processing role of server.

# server-info show
cpu:
  info:
    Architecture: x86_64
    BogoMIPS: 6799.9899999999998
    Byte Order: Little Endian
    CPU MHz: 3399.998
    CPU family: 6
    CPU op-mode(s): 32-bit, 64-bit
    CPU(s): 2
    Core(s) per socket: 1
    Hypervisor vendor: KVM
    L1d cache: 32K
    L1i cache: 32K
    L2 cache: 4096K
    Model: 13
    Model name: QEMU Virtual CPU version (cpu64-rhel6)
    NUMA node(s): 1
    NUMA node0 CPU(s): 0,1
    On-line CPU(s) list: 0,1
    Socket(s): 2
    Stepping: 3
    Thread(s) per core: 1
    Vendor ID: GenuineIntel
    Virtualization type: full
  layout:
    '0': '0'
    '1': '1'
disk:
  sr0:
    model: QEMU DVD-ROM
  vda:
    model: null
    size: 64424509440
    type: HDD
memory:
  MemFree: 158932
  MemTotal: 1922096
  SwapFree: 4128764
  SwapTotal: 4128764
net:
  eth1:
    buffers:
      cur: 2048
      max: 4096
    conf:
      ip: 10.144.63.1/24
      vlan: true
    driver:
      driver: e1000
      version: 7.3.21-k8-NAPI
    queues:
      own: []
      rx: []
      rxtx: []
      shared:
      - virtio1, eth0, eth1
      tx: []
      unknown: []

It also can rate hardware and its features in range of 1..10.

# server-info rate
cpu:
  BogoMIPS: 7
  CPU MHz: 7
  CPU(s): 1
  Core(s) per socket: 1
  L3 cache: 1
  Socket(s): 10
  Thread(s) per core: 10
  Vendor ID: 10
 disk:
   sr0:
     size: 1
     type: 2
   vda:
     size: 1
     type: 1
 memory:
   MemTotal: 1
   SwapTotal: 10
 net:
   eth1:
     buffers:
       cur: 5
       max: 10
     driver: 1
     queues: 1
 system:
   Hypervisor vendor: 1
   Virtualization type: 1

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