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Re: [tcpm] [tsvwg] sce vs l4s comparison plots?

"alex.burr@ealdwulf.org.uk" <alex.burr@ealdwulf.org.uk> Mon, 11 November 2019 11:41 UTC

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Date: Mon, 11 Nov 2019 11:41:05 +0000
From: "alex.burr@ealdwulf.org.uk" <alex.burr@ealdwulf.org.uk>
Reply-To: "alex.burr@ealdwulf.org.uk" <alex.burr@ealdwulf.org.uk>
To: Tom Henderson <tomh@tomh.org>, Dave Taht <dave@taht.net>
Cc: tcpm@ietf.org, tsvwg IETF list <tsvwg@ietf.org>
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Subject: Re: [tcpm] [tsvwg] sce vs l4s comparison plots?
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 (see below)

    On Monday, November 11, 2019, 12:19:26 AM GMT, Dave Taht <dave@taht.net> wrote:  
 

Cool. If only the dsl and cable worlds had adopted this! it allows for
much smarter handling of packet delivery higher in the stack at the cost
of one interrupt's worth of standing queue. Without BQL we wouldn't be
scaling linux past 10GigE today.

I keep hoping *switches* will start doing bql, also.

[AB] at the CO end (ie downstream) my understanding (which may be out of date) 
is that DSL ICs usually punt queuing to a switch IC. There's a standard (G999.1) which existssolely to enable this (it provides per-subscriber backpressure over ethernet). So, switches doingBQL is exactly what would be required for dsl to do BQL (in the downstream direction).
(Given BQL is a workaround, switches would want to implement a direct solution if they do anything).
Alex

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