[Cerowrt-devel] Problems testing sqm

David P. Reed dpreed at reed.com
Fri Oct 23 18:48:22 EDT 2015

Sqm is a way to deal with the dsl or cable modem having bufferbloat. In the configuration described neither end is the problem ... the DUT itself may have bufferbloat. That would be terrible.

On Oct 23, 2015, Richard Smith <smithbone at gmail.com> wrote:
>On 10/23/2015 02:41 PM, Michael Richardson wrote:
>> Richard Smith <smithbone at gmail.com> wrote:
>>      > My test setup:
>>      > Laptop<--1000BaseT-->DUT<--1000baseT-->Server
>> So, given that the DUT is the only real constraint in the network,
>> do you expect to see from this setup?
>> Given that the probably DUT can't forward at Gb/s, and it certainly
>> shape anything, it's gonna drop packets, and it's probably gonna drop
>them in
>> Rx, having overrun the Rx-queue (so tail-drop).  If there is too much
>> (bufferbloated), then you'll see different results...
>Setting ingress/egress to 10Mbit/s I expected to see the speed 
>measurements bounce around those limits with the ping times staying in 
>the low double digits of ms.  What I saw however, was the data rates 
>going well past 10Mbit limit and pings up to 2000 ms.
>This is what I've seen in prior rrul testing using a the 50/10 cable 
>link at our office and my 25(ish)/6 link at my apartment and a well 
>connected server on the net.  That however was using QoS and not SQM.
>Its that a reasonable expectation?

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