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The sqm-scripts traffic shaper

DOI

This repository contains the sqm-scripts traffic shaper from the CeroWrt project. See: http://www.bufferbloat.net/projects/cerowrt/wiki/Smart_Queue_Management

Installing

sudo make install should install things on a regular Linux box. For OpenWrt, there are packages available in the ceropackages repository: https://github.com/dtaht/ceropackages-3.10 and in openwrt nightly builds as well as in the main packages repository (https://github.com/openwrt/packages/tree/master/net/sqm-scripts).

"Installing" the current development version from git

Run the steps below on your own computer (not on the router) to retrieve the newest script version from this repository, create the scripts, then copy those new scripts to your router.

  1. Make a local clone of the git repository (if you have not already):

    git clone https://github.com/tohojo/sqm-scripts

  2. Change into the new directory:

    cd ./sqm-scripts

  3. Make sure the source is updated:

    git pull

  4. Create the scripts for your platform (PLATFORM is either linux or openwrt) and output them to a local current_sqm_base directory:

    make install PLATFORM=openwrt DESTDIR=./current_sqm_base

  5. Change to ./current_sqm_base:

    cd ./current_sqm_base

  6. Optional for OpenWrt: The final step will overwrite your router's current sqm configuration file (at /etc/config/sqm). If you want to preserve the current configuration, delete the newly created config file from the local etc/config:

    rm -r etc/config

  7. Now, use scp to copy the new scripts to the router. Change $YOUR.SQM.HOSTNAME to the address/DNS name for your computer - probably 192.168.1.1 or on cerowrt gw.hom.lan. If your account on the router is not "root", change "root" to your account:

    scp -r ./* root@$YOUR.SQM.HOSTNAME:/

Note this method relies on the presence of the required qdiscs on the router/destination host. On openwrt, you should first install the "normal" sqm-scripts package to take care of all the dependencies, then use this procedure to update to the newest sqm-scripts.

Run-time debugging

SQM_VERBOSITY_MAX controls the verbosity of sqm's output to the shell and syslog (0: no logging; 8: full debug output). SQM_DEBUG controls whether sqm will log the output of the last invocation of start-sqm into var/run/sqm/${interface_name}.start-sqm.log and the ouput of the last invocation of stop-sqm into var/run/sqm/${interface_name}.stop-sqm.log e.g. for pppoe-wan /var/run/sqm/pppoe-wan.start-sqm.log and /var/run/sqm/pppoe-wan.stop-sqm.log.

Examples

  • Log only the binary invocations and their output:

    /etc/init.d/sqm stop ; SQM_DEBUG=1 SQM_VERBOSITY_MAX=0 /etc/init.d/sqm start

  • Log verbose debug output and all the binary invocations and their output:

    /etc/init.d/sqm stop ; SQM_DEBUG=1 SQM_VERBOSITY_MAX=8 /etc/init.d/sqm start

  • Log both start and stop:

    SQM_DEBUG=1 SQM_VERBOSITY_MAX=8 /etc/init.d/sqm stop ; SQM_DEBUG=1 SQM_VERBOSITY_MAX=8 /etc/init.d/sqm start

Note: Both the start and stop log are re-written on every sqm instance start and stop and are logging all output independent of the value of SQM_VERBOSITY_MAX. They will not grow indefintely, but they are written repeatedly. On reliably rewritable media like hard disk, ssd, flash with wear-leveling, or ram-disk, SQM_DEBUG can be safely set to 1 in defaults.sh, but on media like NOR flash that do only allow few write-cycles, keeping the default at 0 and using the above invocations to run a single instance with SQM_DEBUG=1 is recommended.