numalign's Introduction

numalign - tooling to check NUMA resource alignment/positioning

irqcheck tells information about IRQ/softirq cpus affinity.

lsnt reports information about NUMA locality of CPU and devices.

numalign tells you if a set of resources is aligned on the same NUMA node.

sriovscan finds all the SR-IOV (PFs and VFs) devices on the system and report infos about them.

sriovctl is a helper tool to override (kernel allowing) the NUMA placement of SRIOV devices, in case of buggy firmware.

splitcpulist parses a cpulist description and emits the list of all CPUs involved, to be used in shell scripts.

license

build

just run

make

See the READMEs under cmd for informations about each tool.

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numalign's Issues

Status is set to aligned even no PCI device/VF was attached to pod

Even in a pod that does not have any VF attached numalign, the pod is being considered to be aligned from a NUMA perspective. I guess this is probably not very intuitive. For example,

kni@e22-h20-b01-fc640 sriov-operator]$ oc rsh podvert-pod-3
/ # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
3: eth0@if94: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1400 qdisc noqueue state UP 
    link/ether aa:aa:7c:82:02:0d brd ff:ff:ff:ff:ff:ff
    inet 10.130.2.12/23 brd 10.130.3.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::90cc:14ff:fe9e:b35c/64 scope link 
       valid_lft forever preferred_lft forever
/ # numalign
STATUS ALIGNED=true
NUMA NODE=0

This was in a pod with isolated CPUs but no VF attached.

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