[P4-discuss] (Help) Questions about blog "Improving Network Monitoring and Management with Programmable Data Planes"

Libin Liu liulibinsdu at gmail.com
Thu Jan 12 13:40:59 EST 2017

Thanks, Andy. I don't understand that.
You mean the P4 language can not guarantee those information, that is the barefoot switch ASIC which can already provide those information, e.g., link utilization, queue depth, link latency? Thanks a lot.

Best Regards,

> 在 2017年1月13日,02:19,Andy Fingerhut <andy.fingerhut at gmail.com> 写道:
> My understanding is that whether a particular P4 target architecture supports visibility into such information about the queue depths and link utilizations can vary from P4 target to P4 target.  It is not guaranteed by the language to be available for all of them (nor even are the presence of queues guaranteed by the language, e.g. programmable NIC cards might not have any).
> I don't have access to details about current P4 capable switch ASICs, but I would guess that Barefoot's Tofino ASIC family gives such visibility.
> Andy
>> On Thu, Jan 12, 2017 at 5:20 AM, Libin Liu <liulibinsdu at gmail.com> wrote:
>> Dear P4 developers,
>> Hope this email finds you in the best of your health and spirits. 
>> I am very interested in this blog. Can P4 switch already directly measure the link utilization, link latency, and switch queue? If so, where can I get the open source code about the module of measuring link utilization, link latency, and switch queue? Thanks a lot for your help.
>> Best Regards,
>> Libin
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