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Re: "Priority and QoS model"

From: Varun Singh <varun@callstats.io>
Date: Fri, 28 Jul 2017 21:15:54 +0000
Message-ID: <CACHXSv5_C6QLjwy=itOrXJ965gBENgFLEY4XCHDcwB2dypEbkQ@mail.gmail.com>
To: Roman Shpount <roman@telurix.com>
Cc: Cullen Jennings <fluffy@iii.ca>, Göran Eriksson AP <goran.ap.eriksson@ericsson.com>, "public-webrtc@w3.org" <public-webrtc@w3.org>
The issue is unresovled. Hence it's not made it Int'l the spec.

As far as I understood, browsers are setting the TOS bits and on receiving
a packet can get the dscp set on the packet.


On Fri, 28 Jul 2017 at 23.14, Roman Shpount <roman@telurix.com> wrote:

> How would web browser get the TOS bits on the received UDP packets? I know
> how to do this for Linux by setting IP_RECVTOS and using recvmsg. I do
> not think it is possible on any other OS, except by running raw socket or
> packet capture on the interface.
>
> Am I missing something? What is the point of the statistics that cannot be
> computed?
> _____________
>
> Roman Shpount
>
> On Fri, Jul 28, 2017 at 4:02 PM, Varun Singh <varun@callstats.io> wrote:
>
>> It's easy to verify or compare the send and received TOS bits by
>> correlating them.
>> On Fri, 28 Jul 2017 at 22.10, Roman Shpount <roman@telurix.com> wrote:
>>
>>> On Fri, Jul 28, 2017 at 2:51 PM, Cullen Jennings <fluffy@iii.ca> wrote:
>>>
>>>> Just as a stab in the dark on how to do this ...
>>>>
>>>> Perhaps a table that had many packet where received for each DSCP that
>>>> had been received in the last second. And a separate table for sent packets.
>>>>
>>>> Would something like that work ?
>>>>
>>>>
>>> I might be completely out of date on this but how would you get this
>>> information from underlying OS anywhere except Linux? I think this is the
>>> only OS that supports IP_RECVTOS and there is no way to get DSCP
>>> information from the received UDP packet on BSD, OSX, or Windows.
>>>
>>> I do not think anything will actually tell you that setting TOS was
>>> honored by the OS or underlying network equipment.
>>>
>>> Regards,
>>> _____________
>>>
>>> Roman Shpount
>>>
>> --
>> Founder, CEO, callstats.io
>> http://www.callstats.io
>>
>> Interested in networking, media quality, and diagnostics.
>> We are hiring!: www.callstats.io/jobs/
>>
>
> --
Founder, CEO, callstats.io
http://www.callstats.io

Interested in networking, media quality, and diagnostics.
We are hiring!: www.callstats.io/jobs/
Received on Friday, 28 July 2017 21:16:28 UTC

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