75 votes

High CPU utilization but low load average

On Linux at least, the load average and CPU utilization are actually two different things. Load average is a measurement of how many tasks are waiting in a kernel run queue (not just CPU time but also ...
user avatar
  • 1,405
27 votes

High CPU utilization but low load average

Load is a very deceptive number. Take it with a grain of salt. If you spawn many tasks in very quick succession which complete very quickly, the number of processes in the run queue is too small to ...
user avatar
  • 22.7k
11 votes

Environment variables of a running process on Unix?

While rather sparsely documented, the contents of /proc/<pid>/environ will only contain the environment that was used to start the process. If you need to inspect the current state of a process'...
user avatar
10 votes

Can tone ethernet cable into patch panel but it's not working

You can use a Fluke to test the pairs. That will tell you if the cable is bad; all the tone does is confirm that the two ends have electrical connectivity.
user avatar
  • 35.8k
7 votes
Accepted

Fortinet: Is there any equivalent of the ASA's packet-tracer command?

On the Fortigate you actually don't have command with capability to generate a dummy packet like on your cisco ASA. But the closest utility will be "diagnose debug flow" commands. The difference is ...
user avatar
  • 86
7 votes

Environment variables of a running process on Unix?

Taken from the Archlinux wiki: You can create a temporary function to parse the values in /proc/<pid>/environ. At the terminal prompt: envof() { sed 's/\x0/\n/g' /proc/${1}/environ; } Then ...
user avatar
  • 171
7 votes

Program does not run properly as Scheduled Task

I believe your problem has to do with either the permissions of the account being used to run the task, or the context of the account as exists when trying to run the task. Test for Console Session ...
user avatar
6 votes
Accepted

Windows Search Indexer Uses High CPU Usage

The CPU usage you showed in the screenshots is not very high. So let's start by investigating what do you mean by "slowness". It's very likely that your disks are saturated, causing everything to feel ...
user avatar
6 votes
Accepted

80% memory utilization on server- is this just caching?

You have a kernel memory leak. The nonpaged pool is 2.5GB. You can use poolmon to see which driver is causing the high usage. Install the Windows WDK, run poolmon, sort it via P after pool type so ...
user avatar
5 votes

Unable to logoff, disconnect, or reset terminal server user in production environment

The simple answer is to run an elevated command prompt and type "Taskmgr" and then it will allow you to logoff the sessions under the USERS tab. It will not work without being in the elevated session....
user avatar
  • 51
5 votes

High CPU utilization but low load average

If the load average doesn't increase much then it just means that your hardware specs and the nature of the tasks to be processed result in a good overall throughput, avoiding them to be piled up in ...
user avatar
  • 12.7k
5 votes

Can tone ethernet cable into patch panel but it's not working

Since your talking about SOHO routers etc. I'm assuming that a tester from Fluke is way over budget to test one cable? And I've been in the same position where I've had to troubleshoot a cable without ...
user avatar
4 votes

Non-invasive way for our network team to run ping/tracert/etc from various servers

It really depends on how much you trust them. Option 1 - Keep doing it yourself If you don't trust them at all, don't give them any access...though really, they control your firewall, so you must ...
user avatar
  • 17.2k
4 votes

Environment variables of a running process on Unix?

If you want to create formatted env like output of the environment variables for an arbitrary process (PID), you can create a convenient bash penv <pid> command (tailored to your OS) and add it ...
user avatar
4 votes

HTTPS slow/times out while HTTP is working normally

Glad you got a working solution to this. Based on what you have described, this sounds like a Path MTU Discovery Black Hole issue. Essentially, you may well have a router on your route to the ...
user avatar
  • 1,093
4 votes
Accepted

What to do with trailing slash in $HOME on CentOS?

The value of $HOME originates from the /etc/passwd file. You can use usermod --home /home/user user as root to change the home directory of user to be /home/user. The advantage of using usermod rather ...
user avatar
  • 29.7k
3 votes

Best way to troubleshoot apache not starting?

I had similar problem with debug apache server on Mac OS, so decided to share my experience and save others some time I found the following very helpful: locate logs: apachectl -S | grep log in the ...
user avatar
  • 143
3 votes

Tracking down load average

Coming back to this 6 years later, I realized that no answer here is all that useful. Here's by far and away the simplest way to see what's contributing to your load average on Linux: # View ...
user avatar
  • 14.9k
3 votes

Unable to logoff, disconnect, or reset terminal server user in production environment

I had the same issue in Windows Server 2016. The user was not able to login. So I tried the following steps to disconnect the orphaned session: on the CLI qwinsta lists all available sessions, ...
user avatar
  • 249
3 votes
Accepted

How to perform an assessment of an existing network?

You need to know a lot more than you do, to be honest. Even if you had the output from all the tools, and knew where to look for things that can't be automated, what would you do with the information? ...
user avatar
  • 35.8k
3 votes
Accepted

Remote port forwarding through EC2 not working, though address is in use

From your local machine: $ ssh -L5555:localhost:5555 user@remote-machine.example.com Then you'll have access to port 5555 on the remote machine from your local system. Just point your browser to ...
user avatar
  • 108k
3 votes

Debugging slow network

"having no experience" is a bad starting point for complex issues. Unfortunately, more often than not, performance issues tend to be complex. And there is no single diagnostic toolset which, when run, ...
user avatar
  • 40.2k
3 votes

ESXi host halts, console seems responsive but

I suspect an I/O issue. Can you detail the hardware and storage being used? Also provide the ESXi version and build number. Often times, you'll see this happen if the storage used by ESXi becomes ...
user avatar
  • 194k
3 votes
Accepted

High CPU utilization but low load average

While Matthew Ife's answer was very helpful and led us in the right direction, it was not exactly the what caused the behavior in our case. In our case we have a multi threaded Java application that ...
user avatar
3 votes
Accepted

VPS can ping host by IP but not by name

Easy: Because you didn't define an A record for it. A dig +trace +additional ns1.imagihost.com A shows us your nameservers, the glue records, and the output from a nameserver responsible for ...
user avatar
  • 31.6k
3 votes
Accepted

Testing VPN from same network I want to VPN into

You could use a smart phone as a WIFI access point... connect a laptop to it to do all your testing while sitting right at your desk in your office.
user avatar
3 votes
Accepted

DNS issues after KB3200970 and KB3202790 updates installed

You were able to reproduce the issue on another PC? It seems like a networking issue. First try to reset IP and Winsock settings and restart the PC netsh int ip reset c:\resetlog.txt netsh winsock ...
user avatar
3 votes
Accepted

Diagnosing system which persistently recognises SATA drives but refusing to recognise SAS drive or its replacement?

I spoke to LSI (now Avago) tech support for storage, in Germany. They considered that if 2 different kinds of "known good" controller in 2 different machines both recognised all sata but not this sas ...
user avatar
  • 664
2 votes

Troubleshooting ESXi hardware freeze with PCI Passthrough

Realize this question might be dated but still came up as a top google result when I hit this problem. Found a solution here so figured I'd share. My env: VMware ESXi 6.5 SuperMicro SYS-E300-8D ...
user avatar
2 votes

How to investigate unexpected Linux server shut down?

There are a number of logs files in /var/log directory (and it's subdirectories), including /var/log/boot and /var/log/boot.log Start with the files above.
user avatar
  • 21

Only top scored, non community-wiki answers of a minimum length are eligible