[Codel] BQL support in Ethernet drivers (and Kathie Nichols and Van Jacobson's new AQM, codel)

[Rick Jones]

On 05/21/2012 04:30 PM, Rick Jones wrote:
> I think my original ones had the unfortunate effect of putting lines on
> top of one another. Your's seem to put them pretty far apart (at least
> sometimes). We aught to be able to find some reasonable medium in there
> somewhere. I'm thinking if latency is the metric of greatest interest,
> we want that to have the full y axis, and then the peak bandwidth of the
> STREAM test be about half-way up?

I've tweaked the bloat.sh script in a couple ways.  First, I changed how 
I compute the scaling factor, to implement what I described above. 
Second, I am using a negative value for the demo interval for the TCP_RR 
test.  This causes netperf to check if it is time to emit a result after 
each transaction rather than after what it thought would be the number 
of transactions in the interval.  In that way the latency line is much 
more robust in the face of a sudden bloating of the path.  The effect on 
transactions per second should be similar to that of enabling 
histograms.  An example of a test across my 100 Mbit/s link to a laptop 
is attached.

happy benchmarking,

rick jones
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