[Cerowrt-devel] SQM restart and problems on boot fixed

[Sebastian Moeller]

Hi Dave,


On Jan 19, 2014, at 17:36 , Dave Taht <dave.taht at gmail.com> wrote:

> The /etc/hotplug.d/iface/00-debloat script has been wrong in the face
> of the qos-scripts, aqm-scripts, and stuff inbetween.
> 
> Thus on a fresh boot, or after a DHCP renew
> or a variety of other circumstances, the portion of sqm that sets up
> the egress portion of itself gets wiped out.
> 
> this explains a lot of network performance issues that others have had
> after a cero box had been up for a while... the sqm code was getting
> partially disabled!
> 
> This was also probably wrong on a ton of previous releases going back
> to 3.7.5 or earlier. (however since the name has changed, it would be
> aqm for stuff prior to the great renaming, and for 3.7.5 the solution
> is also different because we
> weren't using uci at the time.
> 
> but for 3.10.24 and later replace /etc/hotplug.d/iface/00-debloat with this.
> 
> #!/bin/sh
> 
> #DEBLOAT_LOG=/tmp/debloat.log
> #DEBLOAT_LOG2=/tmp/debloat2.log
> DEBLOAT_LOG=/dev/null
> DEBLOAT_LOG2=/dev/null
> 
> SQM=0
> SQM=`uci get sqm.${DEVICE}.enabled`
> 
> [ "$ACTION" = "ifup" -a "$SQM" != "1" ] && {
>        IFACE=$DEVICE QMODEL=fq_codel_ll /usr/sbin/debloat >>
> $DEBLOAT_LOG 2>> $DEBLOAT_LOG2
> }

	Excellent find, must have been tricky to catch with it only triggering ever so often. I assume that this triggering will also have removed the HTB from egress, so that "tc -d qdisc" always reported the actual running setup?

best
	Sebastian


> 
> 
> -- 
> Dave Täht
> 
> Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html
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