[Bloat] latency measurement tools?

[Bloat] latency measurement tools?

[Eggert, Lars]

Hi,

what are the preferred measurement tools for latency under load? Are any publicly available or is everyone basically rolling their own?

(I'm esp. interested in tools that can deal with 10 GbE and faster LAN fabrics.)

Thanks,
Lars

Re: [Bloat] latency measurement tools?

[Eggert, Lars]

Thanks, I'll check it out!

Lars

On Feb 14, 2013, at 0:56, Toke Høiland-Jørgensen <toke@toke.dk> wrote:

> "Eggert, Lars" <lars-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org> writes:
> 
>> what are the preferred measurement tools for latency under load? Are
>> any publicly available or is everyone basically rolling their own?
> 
> Hi Lars
> 
> Usually, people employ netperf and/or iperf to load up a link, and then
> do some sort of latency measurement while the link is loaded (through
> netperf or just straight ping). I'm the author of a python wrapper that
> handles this in a reproducible way, and which also has a prototype of
> the Realtime Response Under Load (RRUL) test incorporated. The wrapper
> is available here:
> 
> https://github.com/tohojo/netperf-wrapper
> 
> (Or just install it through pip with `pip install netperf-wrapper`).
> 
> Also see this page for some example test plots:
> 
> http://www.bufferbloat.net/projects/codel/wiki/RRUL_Rogues_Gallery
> 
> And this one for some general advise on benchmarking (though that is
> mostly relevant at lower bandwidths):
> 
> http://www.bufferbloat.net/projects/codel/wiki/Best_practices_for_benchmarking_Codel_and_FQ_Codel
> 
>> (I'm esp. interested in tools that can deal with 10 GbE and faster LAN
>> fabrics.)
> 
> The RRUL test prototype runs four simultaneous TCP streams in each
> direction which can generally load up pretty much any link on a modern
> Linux kernel (though I haven't tested it personally on high-speed
> networks due to lack of hardware).
> 
> Good luck with the benchmarking. :)
> 
> -Toke
> 
> -- 
> Toke Høiland-Jørgensen
> toke@toke.dk