LinuxQuestions.org - How to check network speed conection

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- - How to check network speed conection (https://www.linuxquestions.org/questions/linux-hardware-18/how-to-check-network-speed-conection-930925/)

Quote:

Originally Posted by sarath@slashroot.in (Post 4884580)

Hi..

Speed testing using iperf is a credible method.
Because iperf can be used to modify even the operating system window size while testing the speed. Window size plays a major role in throughput.
Also you can determine the jitter, and data grams dropped using iperf. It works on a client server model.
I recommend going thorough Network Speed test using iperf

All you seem to be doing with your posts is re-opening old threads, and posting links back to the company you work for, to download/use some third-party utility. LQ does have rule about advertising/spamming, but that's a determination for the moderators to make, but you were warned about it before.

Also, re-opening threads that are all over a year old (and in some cases, EIGHT years old), just to post your website, isn't very effective.

Moderator Response

Hi,

The link: Network Speed test using iperf does provide useful information for members within this thread. I see no violation since sarath@slashroot.in post provides helpful information to LQ members that wish to verify the speed of connection within this thread or for that matter anyone who reaches this thread.

As to iperf;

Quote:

excerpt from https://en.wikipedia.org/wiki/Iperf
Iperf is a commonly used network testing tool that can create TCP and UDP data streams and measure the throughput of a network that is carrying them. Iperf is a tool for network performance measurement written in C++. Iperf was developed by the Distributed Applications Support Team (DAST) at the National Laboratory for Applied Network Research (NLANR).
Iperf allows the user to set various parameters that can be used for testing a network, or alternately for optimizing or tuning a network. Iperf has a client and server functionality, and can measure the throughput between the two ends, either unidirectionally or bi-directionally. It is open source software and runs on various platforms including Linux, Unix and Windows.

UDP: When used for testing UDP capacity, Iperf allows the user to specify the datagram size and provides results for the datagram throughput and the packet loss.
TCP: When used for testing TCP capacity, Iperf measures the throughput of the payload. One thing to note is that Iperf uses 1024*1024 for megabytes and 1000*1000 for megabits.

Typical Iperf output contains a timestamped report of the amount of data transferred and the throughput measured.
Iperf is significant as it is a cross-platform tool that can be run over any network and output standardized performance measurements. Thus it can be used for comparison of wired and wireless networking equipment and technologies in an unbiased way[citation needed]. Since it is also open source, the measurement methodology can be scrutinized by the user as well.

I see no issue with directing a member to a utility;

Quote:

excerpt from http://iperf.sourceforge.net/
Iperf Iperf was developed by NLANR/DAST as a modern alternative for measuring maximum TCP and UDP bandwidth performance. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss.

The original thread is about 11 months old, thread resurrection by sarath@slashroot.in and providing useful information(constructive) is not a violation.

As to a spam violation, providing a informative link is not a violation. The linked site is not a commercial venue but a site to help others via compiled information;

Quote:

excerpt from http://www.slashroot.in/about-us

Slashroot.in is a technical Blog site platform for howtos, documentation, tutorials and articles. We will be concentrating more on topics related to Linux. However we will also be including topics relevant to other platforms from time to time. The content we publish here in slashroot.in is our notes and observations on a topic of interest, which might prove useful to others. We will be very much delighted to accept modification or correction requests through our comment section, which will improve ours and other's grasp over the topic.

As a member, I reference sites of this sort all the time to LQ members in hope of helping to solve their issue/query. I know of other members who do the same.

Hope this helps to clarify things a bit!

Quote:

Originally Posted by onebuck (Post 4887110)

I see no violation since sarath@slashroot.in post provides helpful information to LQ members that wish to verify the speed of connection within this thread or for that matter anyone who reaches this thread.

Hope my information will be (seen as ;) ) helpfull too.

Brief:
While older Debian kernel modules r8169.ko has some issue reducing 1GB cards to run on 100MB speed, installing new version (rmmod old, modprobe new) SOLVED the problem (at least for me). As of this writting the pre-compiled module lib/modules/3.12-1-amd64/kernel/drivers/net/ethernet/realtek/r8169.ko is current "testing" and I have seen no issue (either LAN, NAS or Internet) since install.

Longer story:
After reading this thread I decided to download official module from the Realtek web and compile from source. Following the readme instructions I did rmmod r8169, as this is the step #1 in accompanied readme document. DO NOT follow this sequence literrary, as rmmoding this module instantly (and silently) disabled my Ethernet interface. Trying to compile in further steps I ran into missing kernel-dev packages and through aptitude learned, that my internet connection has gone.

As a temporary workaround I decided to modprobe the module back. Now I found out, that I have two different versions available:

/lib/modules/3.2.0-4-amd64/kernel/drivers/net/ethernet/realtek/r8169.ko 72424 2013-09-20
originating from official (curent as of writting) Debian installation CD
and
/lib/modules/3.12-1-amd64/kernel/drivers/net/ethernet/realtek/r8169.ko 97984 2013-12-29
downloaded during update to testing (jessie as of writting) distro.

Not a surprise I decided to use newer version and voila - network runs 1GB speed out of box instantly. No reboot or networking restart needed even.

Hope this will help all the patient, who have followed this thread to this end :p .