5 ms·

Huh, does "ip" also support "tc" (traffic control) commands - qdisc is a queueing discipline... tc seems to be the an earlier thing from the people who brought

Huh, does "ip" also support "tc" (traffic control) commands - qdisc is a queueing discipline... tc seems to be the an earlier thing from the people who brought us ip. tc must have the worst command line interface and documentation ever - it is very hard and very frustrating to use, like no other command line interface I've ever seen. I once tried to use tc and gave up after more than a day of trying, that is how bad it is. The syntax is a word soup and the semantics are very poorly explained.

pas 8y ago
ip/ss/tc are all netfilter based things all in the iproute2 repo. http://inai.de/images/nf-packet-flow.png http://inai.de/images/nf-packet-flow.png tc is implemented by packet pacing at either egress or ingress steps. and this is how iproute2 compares to the old net-tools stuff: https://linoxide.com/wp-content/uploads/2014/05/Linux-Nettools-vs-Iproute2.png https://linoxide.com/wp-content/uploads/2014/05/Linux-Nettoo... netfilter: https://en.wikipedia.org/wiki/Netfilter#/media/File:Netfilter-components.svg https://en.wikipedia.org/wiki/Netfilter#/media/File:Netfilte... regarding UI/UX/CLI. yes, there's no arguing about it, it's just horrible. no documentation, no discoverability, no sanity. but it works, and it's free :o
OnMyPhone 8y ago
I spent a bit too long on playing with tc a while ago. The best I could get it was to limit each person's download speeds from the one internet connection we had. I'm with you on tc having the worst interface and documentation that I have seen from a command before. I spent maybe a few days total on it then gave up because I figured if there isn't much documentation on it, it isn't worth figuring out.
- sanjayjc 8y ago
  I used tc for something interesting once: I setup Cassandra nodes in distinct docker containers running on a single laptop. I installed tc in each container to throttle packets flowing between containers and in so doing, simulated a lossy, high latency WAN network. The goal was to evaluate how Cassandra fared as network latencies increased. tc fit the bill nicely.
  - nineteen999 8y ago
    Did you remember to disable your swap file/partition? https://stackoverflow.com/questions/22988824/why-swap-needs-to-be-turned-off-in-datastax-cassandra https://stackoverflow.com/questions/22988824/why-swap-needs-...
SEJeff 8y ago
MegaCLI (lsi hw raid control) sees your tc and raised you a few million awful flags.
- russh 8y ago
  I'm pretty sure MegaCLI was written by someone who used to write software for digital phone switches.
- duskwuff 8y ago
  Ah, my old friend MegaCLI. Simultaneously the most verbose and the most useless --help output I've ever seen from a command-line program.
- Thlom 8y ago
  After working with it almost daily for years I'm finally fluent in MegaCLI. I can even understand the --help for the most part. Time to get a new job I guess.
  - mmt 8y ago
    Nah.. Just time to relearn it all with StorCLI instead.
    - Thlom 8y ago
      :-(
- trelliscoded 8y ago
  I see your MegaCLI and raise you certutil: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/certutil https://docs.microsoft.com/en-us/windows-server/administrati...
  - SEJeff 8y ago
    Oh fair enough but in the context of Linux command lines I think MegaCLI is genuinely one of the worst UX designs ever. Up until recently (post Balmer), Microsoft didn’t heavily emphasize the CLI for most things so a bad UX is not surprising.

pas 8y ago

ip/ss/tc are all netfilter based things all in the iproute2 repo. http://inai.de/images/nf-packet-flow.png http://inai.de/images/nf-packet-flow.png tc is implemented by packet pacing at either egress or ingress steps. and this is how iproute2 compares to the old net-tools stuff: https://linoxide.com/wp-content/uploads/2014/05/Linux-Nettools-vs-Iproute2.png https://linoxide.com/wp-content/uploads/2014/05/Linux-Nettoo... netfilter: https://en.wikipedia.org/wiki/Netfilter#/media/File:Netfilter-components.svg https://en.wikipedia.org/wiki/Netfilter#/media/File:Netfilte... regarding UI/UX/CLI. yes, there's no arguing about it, it's just horrible. no documentation, no discoverability, no sanity. but it works, and it's free :o

OnMyPhone 8y ago

I spent a bit too long on playing with tc a while ago. The best I could get it was to limit each person's download speeds from the one internet connection we had. I'm with you on tc having the worst interface and documentation that I have seen from a command before. I spent maybe a few days total on it then gave up because I figured if there isn't much documentation on it, it isn't worth figuring out.

sanjayjc 8y ago
I used tc for something interesting once: I setup Cassandra nodes in distinct docker containers running on a single laptop. I installed tc in each container to throttle packets flowing between containers and in so doing, simulated a lossy, high latency WAN network. The goal was to evaluate how Cassandra fared as network latencies increased. tc fit the bill nicely.
- nineteen999 8y ago
  Did you remember to disable your swap file/partition? https://stackoverflow.com/questions/22988824/why-swap-needs-to-be-turned-off-in-datastax-cassandra https://stackoverflow.com/questions/22988824/why-swap-needs-...

SEJeff 8y ago

MegaCLI (lsi hw raid control) sees your tc and raised you a few million awful flags.

russh 8y ago
I'm pretty sure MegaCLI was written by someone who used to write software for digital phone switches.
duskwuff 8y ago
Ah, my old friend MegaCLI. Simultaneously the most verbose and the most useless --help output I've ever seen from a command-line program.
Thlom 8y ago
After working with it almost daily for years I'm finally fluent in MegaCLI. I can even understand the --help for the most part. Time to get a new job I guess.
- mmt 8y ago
  Nah.. Just time to relearn it all with StorCLI instead.
  - Thlom 8y ago
    :-(
trelliscoded 8y ago
I see your MegaCLI and raise you certutil: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/certutil https://docs.microsoft.com/en-us/windows-server/administrati...
- SEJeff 8y ago
  Oh fair enough but in the context of Linux command lines I think MegaCLI is genuinely one of the worst UX designs ever. Up until recently (post Balmer), Microsoft didn’t heavily emphasize the CLI for most things so a bad UX is not surprising.