Re: icmp latency question

Linux Advanced Routing and Traffic Control

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Andrew Beverley wrote:
<snip>
> For SSH I have:
> tc class add dev imq0 parent 1:1 classid 1:10 htb rate 50kbit ceil 800kbit
> prio 1
> tc qdisc add dev imq0 parent 1:10 handle 10: sfq perturb 10
> tc filter add dev imq0 parent 1:0 prio 0 protocol ip handle 10 fw flowid
> 1:10

sfq's default queue of 128 may cause you some pain.  You could try a pfifo
10 or recompile after modifying sch_sfq.c in your kernel tree.  Also, using
the prio parameter with htb may not do what you expect when you exceed your
specified rate.  The htb documentation explains the effects in detail.

You could also get spikes from running over an ATM link where your specified
rate and the actual ATM link utilization will likely differ.



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