NETEM - fq_codel and pfifo_fast change/add tc rule Post: 303039015

Sponsored Content

Contact Us Post Here to Contact Site Administrators and Moderators How to Post in the The UNIX and Linux Forums NETEM - fq_codel and pfifo_fast change/add tc rule Post 303039015 by Priya Amaresh on Thursday 19th of September 2019 03:38:39 PM

09-19-2019

Registered User

NETEM - fq_codel and pfifo_fast change/add tc rule

HI,
I am trying to understand netem operation over Linux

when I issued tc show command i see as follows:

Code:

ing:~ tc qdisc show dev en1
qdisc mq 0: root
qdisc fq_codel 0: parent :18 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 32Mb ecn
qdisc fq_codel 0: parent :17 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 32Mb ecn
qdisc fq_codel 0: parent :16 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 32Mb ecn
ing:~

Now when i try to add/change tc qdisc with a loss of 0.5% I see following error:

Code:

ing:~ tc qdisc change dev en1 root netem loss 0.5%
Error: Qdisc not found. To create specify NLM_F_CREATE flag.
ing:~ tc qdisc add dev en1 root netem loss 0.5%
Error: Specified qdisc not found.
ing:~

How to fix it ??
Also i tried setting back to pfifo_fast (default netem rule) and then tried to add loss of 0.5% i see following issue

Code:

ing:~ tc qdisc add dev en1 root pfifo_fast
ing:~ tc qdisc show dev en1
qdisc pfifo_fast 8004: root refcnt 92 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
ing:~ tc qdisc add dev en1 root netem loss 0.5%
Error: Exclusivity flag on, cannot modify.
ing:~

Here again I tried deleting pfifo_fast tc rule but fq_codel got set back and where i was unable to set loss 0.5%

Priya Amaresh

View Public Profile for Priya Amaresh

Find all posts by Priya Amaresh

7 More Discussions You Might Find Interesting

1. Email Antispam Techniques and Email Filtering

procmail rule

I can tell this is not a recently active formum, but here goes, "why doesn't this procmail rule block messages with v�agra or v1agra appearing in the subject header :0 * ^Subject:.*(v�agra�v1agra�p�nis�prescripti0n�Medicati0n�M0rtgage�Xanaxz) { LOG="(THE 7 DIRTY WORDS) " :0 ...

2. Shell Programming and Scripting

How do I add the option to change the path in a menu?

How do I add the option to change the path in a menu? I have this script. The user chooses a number and had the option of doing something, looking for log files etc. There is a possibility they might want to look at a different path other than what I have given them such as...

3. Post Here to Contact Site Administrators and Moderators

Rule # 8

In light of this board's rule stating "no BSD vs. Linux vs. Windows or similar threads," is the following post legal (can I post it)? Hi. I'm thinking about obtaining a web server for business purposes and I want to learn to administer and maintain the server myself. I need to be able to use...

4. UNIX for Dummies Questions & Answers

BASH: Change alias to script to add a task

Hi. I use an alias, "homeperm" as shorthand for curl -o. Since most of what I download via cUrl is graphic image files -- jpeg files -- I'd like to be able to change this alias to a script, or use it to invoke a function, which will not only download the file but date-stamp it using Exiv2 in...

5. UNIX for Dummies Questions & Answers

Using sed to change lines and add them if they don't exist..

I've googled the hell out of this, and in my quest to advance my knowledge and expertise in modifying phones to make them more awesome, I ended up here. I've found answers about patterns and whatnot that seem really complex for what I am trying to do, and basically it is this: if the line says...

6. Shell Programming and Scripting

Add character to specific columns using sed or awk and make it a permanent change

Hi, I am writing a shell script where I want that # should be added in all those lines as the first character where the pattern matches. file has lot of functions defined a.sh #!/bin/bash fn a { beautiful evening sunny day } fn b { } fn c { hello world .its a beautiful day ...

7. UNIX for Beginners Questions & Answers

Command to change add permissions for a new user to all files in all subfolders and folders

Hi there! I'm new to Unix and haven't done command line stuff since MS-Dos and Turbo Pascal (hah!), I would love some help figuring out this basic command (what I assume is basic). I'd like to add a User to the permissions of all files in a folder and all files in all subfolders, as well...

7 More Discussions You Might Find Interesting

1. Email Antispam Techniques and Email Filtering

procmail rule

Discussion started by: jones

2. Shell Programming and Scripting

How do I add the option to change the path in a menu?

Discussion started by: taekwondo

3. Post Here to Contact Site Administrators and Moderators

Rule # 8

Discussion started by: bluegospel

4. UNIX for Dummies Questions & Answers

BASH: Change alias to script to add a task

Discussion started by: SilversleevesX

5. UNIX for Dummies Questions & Answers

Using sed to change lines and add them if they don't exist..

Discussion started by: Silentbtdeadly

6. Shell Programming and Scripting

Add character to specific columns using sed or awk and make it a permanent change

Discussion started by: ashima jain

7. UNIX for Beginners Questions & Answers

Command to change add permissions for a new user to all files in all subfolders and folders

Discussion started by: Janjbrt