Hi Lars,
On May 15, 2015, at 10:18 , Eggert, Lars <l...@netapp.com> wrote:
> On 2015-5-15, at 06:44, Aaron Wood <wood...@gmail.com> wrote:
>> ICMP prioritization over TCP?
>
> Probably.
Interesting so far I often heard ICMP echo requests are bad as they are
often rate-limited and/or processed in a slow path in routers...
>
> Ping in parallel to TCP is a hacky way to measure latencies; not only because
> of prioritization, but also because you don't measure TCP send/receive buffer
> latencies (and they can be large, auto-tuning is not so great.)
I guess the concurrent ICMP echo requests are a better measure for flow
separation and sparse-flow-boostiing than inter-flow latency. TCP embedded
timestamps would be a jacky way to measure those ;) .
>
> You really need to embed timestamps in the TCP bytestream and echo them back.
> See the recent netperf patch I sent.
I hope this makes into the main netperf branch…
Best Regards
Sebastian
>
> Lars
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