> From: Saku Ytti [mailto:[email protected]]
> Sent: Friday, July 29, 2016 1:58 PM
>
> On 29 July 2016 at 15:00, Adam Vitkovsky <[email protected]>
> wrote:
>
> Hey,
>
> > Ok that makes sense, but I have read somewhere that on MX80 (not sure
> > about MX104), only MICs have H-QOS (but I'd expect the H-QOS to be
> > available in the WAN out rather than Fabric out direction).
> > So I probably remember it the other way around it's the integrated
> > ports that only support H-QOS then?
>
> You remember correctly.
>
> It's not HW restriction, QX does not care where the packets came in.
> Problem is QX is isn't fast enough to do deal with 40Gbps OUT. Then they
> added IN support. So It would need to support 40+40+40+40, to do
> in+out on all ports, when it can't support 40.
Yeah nowhere close to that.
Now that I think about it I agree that it doesn't matter whether the traffic
comes to LU from WAN or Fabric resulting in LU classifying the packet and
sending chunk pointers to QX to maintain queues, so in this sense QX couldn't
care less where the traffic came from.
It's just if QX has to maintain queues for both Fab-to-WAN as well as
WAN-to-Fab the available delay buffer memory would have to be divided to two
and the QX would have to process twice the amount of chunk pointers per second.
So yeah all in all probably not a good idea to enable it in both directions.
> I guess they just wanted to avoid people oversubscribing QX too much,
> probably had to add code to create the limit.
>
Yeah that's definitely it.
Though on Gen2 Trio you could select which ports will use QX (rich queuing) so
it's not all or nothing anymore and you can carefully chose how much traffic
does the QX have to deal with.
adam
Adam Vitkovsky
IP Engineer
T: 0333 006 5936
E: [email protected]
W: www.gamma.co.uk
This is an email from Gamma Telecom Ltd, trading as “Gamma”. The contents of
this email are confidential to the ordinary user of the email address to which
it was addressed. This email is not intended to create any legal relationship.
No one else may place any reliance upon it, or copy or forward all or any of it
in any form (unless otherwise notified). If you receive this email in error,
please accept our apologies, we would be obliged if you would telephone our
postmaster on +44 (0) 808 178 9652 or email [email protected]
Gamma Telecom Limited, a company incorporated in England and Wales, with
limited liability, with registered number 04340834, and whose registered office
is at 5 Fleet Place London EC4M 7RD and whose principal place of business is at
Kings House, Kings Road West, Newbury, Berkshire, RG14 5BY.
---------------------------------------------------------------------------------------
This email has been scanned for email related threats and delivered safely by
Mimecast.
For more information please visit http://www.mimecast.com
---------------------------------------------------------------------------------------
_______________________________________________
juniper-nsp mailing list [email protected]
https://puck.nether.net/mailman/listinfo/juniper-nsp
