Package: iproute2 Version: 4.14.1-1~bpo9+1 Severity: normal Dear Maintainer,
I found some problems in tc class show and tc filter show commands. We use tc in large scale (thousands of subnets) on multiple servers. Whole shaping system is udergoing large overview and I'm rewriting it almost from the scratch. Tc rules are one of key elements so I started to check and change its whole structure. Until now we had everything in parent qdisc 1:0 (all tc filter rules, tc classes). Now I decided to change it, so a lot of classes have its own hfsc qdiscs and in this qdiscs I create whole new structure of tc classes, tc filters a tc qdiscs. Let's say it is a tree within a tree. I can provide simple (prototype) bash script, which led to my discovery. (https://pastebin.com/A57x8fq5 - comments are in czech since I didn't plan to release it anywhere :-) - I can provide further info if needed. Problem is very annoying since I need to get stats from tc -s class show dev ...etc. 1. First problem - tc class show dev enp0s31f6 prints whole structure two times. I compared it with "sudo tc -s class show dev enp0s31f6" | grep -c "class" vs "sudo tc -s class show dev enp0s31f6" | sort | uniq | grep -c "class" which produces about a half of records. Reference class 2000:ffff (produced by my script 2000 - 4fff) is shown twice (same for 2000: root). I'm not sure about behavior of executing command twice in this case but it can't be defined twice for sure. Tc is veeery picky :-) 2. Second problem - tc filter show dev enp0s31f6 show just the parent 1:0 rules. This one is not so critical, since I don't read stats regularly, but for debugging it is very inconvenient since one has to know classId of whole parent (let's say 2000:0 qdisc in which all those filters reside). When I execute tc filter show dev enp0s31f6 parent 2000: (including colon :-) I get all those defined filter rules and hash tables. But not with base command. I discovered this on version 4.9 from stable stretch repository. I tried to install backport version 4.14 but resutls were exactly the same. I didn't try to reboot after upgrade yet tho. I'll do this after finishing this bugreport. I didn't try to compile newest version from source since I need some kind of stable solution to put it on 21 servers. What I expected was to see defined classes just once. And to see tc filter rules with base show command without specifying parent's classid for every hfsc qdisc containing additional rules and hash tables. -- System Information: Debian Release: 9.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.9.0-5-amd64 (SMP w/12 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages iproute2 depends on: ii libc6 2.24-11+deb9u3 ii libdb5.3 5.3.28-12+deb9u1 ii libelf1 0.168-1 ii libmnl0 1.0.4-2 ii libselinux1 2.6-3+b3 Versions of packages iproute2 recommends: pn libatm1 <none> ii libxtables12 1.6.0+snapshot20161117-6 Versions of packages iproute2 suggests: ii iproute2-doc 4.14.1-1~bpo9+1 -- no debconf information
