[FS#3495] kmod-sched should include additional qdiscs: qfq, drr, sfb

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Tue Dec 8 17:23:47 EST 2020


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A new Flyspray task has been opened.  Details are below. 

User who did this - Daniel Lakeland (dlakelan) 

Attached to Project - OpenWrt/LEDE Project
Summary - kmod-sched should include additional qdiscs: qfq, drr, sfb
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on

all devices

 - Software versions of OpenWrt/LEDE release, packages, etc.

current release 19.x.x and trunk

 - Steps to reproduce
   
install kmod-sched see that it does not have a full set of qdiscs which reduces the utility of targeted high-interactivity scheduling designs such as: 

https://raw.githubusercontent.com/dlakelan/routerperf/master/SimpleHFSCgamerscript.sh

The most important ones in my mind are:

qfq: an important weighted queue discipline which lets you balance bandwidth within another class, so it's useful to place below a HFSC class to balance the users within the class in a purposefully weighted *unfair* way. it's more efficient than drr so if a choice needs to be made between the two for size reasons, qfq is preferable

drr: does similar thing to above but less computationally efficient... probably not needed if qfq can be provided

sfb: this can be a better qdisc if you are trying to do fair queueing on UDP streams which do not respond to signalling the way TCP does, this will tend to delete packets from the "heavy" streams. 

Overall it's important for good custom queueing to have all of the following qdiscs in my opinion:

hfsc, red, cake, qfq, bfifo, pfifo, sfb



More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3495

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