Hi Toke,

> On Sep 29, 2019, at 21:08, Toke Høiland-Jørgensen <notificati...@github.com> 
> wrote:
> 
> flent-users <notificati...@github.com> writes:
> 
> > Hi Toke,
> >
> >> On Sep 29, 2019, at 20:44, Toke Høiland-Jørgensen 
> >> <notificati...@github.com> wrote:
> >> 
> >> Rich Brown <notificati...@github.com> writes:
> >> 
> >> > Sorry for the delay in responding... The higher granularity makes much
> >> > better plots (see below).
> >> 
> >> Great!
> >> 
> >> > Using `-m 2048,2048` I don't see a whole lot of load on my Mac 2.5 GHz
> >> > Intel Core i7 at 7mbps/768kbps. Thanks.
> >> 
> >> No, don't expect it would. The CPU usage thing will hit you at high
> >> rates (I was testing on a gigabit link).
> >> 
> >> I'm not sure we can realistically pick an option that works well for
> >> both slow and fast links. So we may have to add a switch; and then the
> >> problem becomes what to use for defaults...
> >
> > How about make it not a "switch" but a numeric parameter, and
> > default to the current default value by principle of least
> > surprise?
> 
> Well, by "switch" I just meant "new command line option".

        Oops, sorry, I read this as a switch to toggle between say the default 
(which seems system dependent not petperf dependent, no?) and a value for low 
bandwidth links, say 1460...

> The obvious
> form of that would be, as you say, just the ability to set the netperf
> xfer size directly...

        I guess that would be the best compromise, if the user knows about a 
links asymmetry the send and receive buffers can be sized accordingly like 16K, 
1600 for DOCSIS down-/upload...

I also wonder whether flent should not try to also record and parse /proc/stat 
to detect CPU overload (so the user could be warned/informed to increase the 
xfer size if there is danger of being CPU bound)?


Best Regards
        Sebastian


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