Re: [Bloat] Netperf re-licensed as MIT

[Dave Taht <dave.taht@gmail.com>]

irtt is used if available.

I agree that the ping method is poor at lower scales. The ping volume
also accounts for more bandwidth the lower the rtt which rrul does not
measure. I would not mind trying to produce a rrul2021 test that
updated it better for modern conditions.

On Mon, Mar 29, 2021 at 11:29 AM Aaron Wood <woody77@gmail.com> wrote:
>
> One of my long concerns with the RRUL test is that the ICMP ping test portion is not isochronous, and runs at a variable rate based on rtt, which means that it uses more/less bandwidth as an inverse function of rtt, and that makes it harder to compare the actual goodput of the tcp streams running in parallel.  (When the top-line total bw goes down when latency goes down, because the icmp and udp ping tests are using more bandwidth that isn’t accounted for in the bw totals)
>
> On Sat, Mar 27, 2021 at 2:45 PM Dave Taht <dave.taht@gmail.com> wrote:
>>
>> most of the latency related portions of flent use irtt, which I think
>> is a lot more solid than anything else.
>>
>> On Sat, Mar 27, 2021 at 2:44 PM Dave Taht <dave.taht@gmail.com> wrote:
>> >
>> > so glad to hear the license has been fixed.
>> >
>> > carl, iperf is only used in a few of flent's tests. We trusted netperf
>> > - as did the linux kernel developers - a lot further than all the
>> > iperf variants combined - at the time we started work on flent.
>> >
>> > I would not mind us somehow developing a drop in replacement for
>> > netperf, perhaps leveraging the irtt codebase, as I have a long
>> > standing desire to be able to reliably measure latencies and the
>> > output of TCP_INFO in "some" tool below 250us.
>> >
>> > iperf has come a long way, but getting to where I could trust the
>> > largely "academic" codebase it was would take a ton of benchmarking.
>> >
>> > On Sat, Mar 27, 2021 at 2:09 PM Klatsky, Carl via Bloat
>> > <bloat@lists.bufferbloat.net> wrote:
>> > >
>> > > Toke,
>> > >
>> > > How you see this coming into Flent?  My understanding is that for latency & load test like RRUL:
>> > >
>> > > -iperf provides the bandwidth portion
>> > > -IRTT provides the latency portion, and if IRTT is not found, the test falls back to ICMP for the latency check
>> > >
>> > > Would netperf replace iperf for the bandwidth portion?  Do you see it being used for the latency portion?
>> > >
>> > > Thanks,
>> > > Carl
>> > >
>> > > -----Original Message-----
>> > > From: Bloat <bloat-bounces@lists.bufferbloat.net> On Behalf Of Toke Høiland-Jørgensen via Bloat
>> > > Sent: Friday, March 26, 2021 7:32 PM
>> > > To: bloat <bloat@lists.bufferbloat.net>
>> > > Subject: [Bloat] Netperf re-licensed as MIT
>> > >
>> > > Hopefully this means we can get it packaged for the distros that have thus far refused to because of the license - i.e., Debian and Fedora!
>> > >
>> > > -Toke
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>> >
>> > --
>> > "For a successful technology, reality must take precedence over public
>> > relations, for Mother Nature cannot be fooled" - Richard Feynman
>> >
>> > dave@taht.net <Dave Täht> CTO, TekLibre, LLC Tel: 1-831-435-0729
>>
>>
>>
>> --
>> "For a successful technology, reality must take precedence over public
>> relations, for Mother Nature cannot be fooled" - Richard Feynman
>>
>> dave@taht.net <Dave Täht> CTO, TekLibre, LLC Tel: 1-831-435-0729
>> _______________________________________________
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>
> --
> - Sent from my iPhone.



-- 
"For a successful technology, reality must take precedence over public
relations, for Mother Nature cannot be fooled" - Richard Feynman

dave@taht.net <Dave Täht> CTO, TekLibre, LLC Tel: 1-831-435-0729