• 8

A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191


File: /home/prodcxja/public_html/questions/application/views/question.php
Line: 191
Function: _error_handler

File: /home/prodcxja/public_html/questions/application/controllers/Questions.php
Line: 433
Function: view

File: /home/prodcxja/public_html/questions/index.php
Line: 315
Function: require_once

name Punditsdkoslkdosdkoskdo

Samba fails Achilles Level 2 tests

During certain Achilles tests, CPU consumption of Samba rises to 100%.

I am doing Achilles tests on a Linux-based server. I have noticed that during certain tests (and UDP port discovery), the temperature of the CPU cores surges to around 80-90 °C which causes the CPU clock to throttle and renders the server practically unresponsive.

Following closer investigations, we found out that there is a direct link between the rise of CPU consumption by a certain process and the CPU temperature. In our case, the concerned process is Samba

We are using samba4 in the full active directory mode.

Environment details:

  • OS: Ubuntu 14.04 LTS
  • Samba version: 4.3.11

In our environment, there is a direct connection between the server running Samba and the test PC; no other element in the network.

As far as we understand, this looks like a DoS attack. Certain tests render the server completely unresponsive.

Is this a known issue? If yes, is there a fix for it?

Thank you in advance.

      • 2
    • If your server cooling cannot cool down the temperature during 100% usage I would rather check the cooling and if a fan failed. Trying to make a process responsible is the wrong end to fix things here.
      • 2
    • Well we have also contacted the server manufacturer regarding this issue. The purpose of my question was not to blame the process, in fact I would simply like to know why samba consumes 100% of my CPU under certain tests. It is definitely abnormal isn't it?
      • 1
    • If you stress test samba then it is very likely that it will reach 100% CPU usage. Under normal circumstances it is abnormal, but that also depends on the amount of samba mounts, what the users do, network traffic etc.

Warm tip !!!

This article is reproduced from Stack Exchange / Stack Overflow, please click

Trending Tags