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Page 1: Active Queue Management (for Cloud Services)

V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

Active Queue

ManagementMahesh Paolini-Subramanya (@dieswaytoofast)V.P. R&D, Ubiquiti Networks

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Metrics

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Metrics

Phone calls per Second

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Active Queue Management

The Metrics

Phone calls per Second

x 1000

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Active Queue Management

The Metrics

Simultaneous Phone Calls

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Metrics

Simultaneous Phone Calls

x 10,000

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Active Queue Management

The Metrics

API Requests

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Metrics

API Requests

∞

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Active Queue Management

Multi-Site

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Active Queue Management

My Vacation

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Active Queue Management

(Actually, the day before)

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Active Queue Management

A small failure…

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Active Queue Management

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Horror! The Horror!

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Why are my calls failing?

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You better call me back!

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I’m still p***ed off!

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And you’re stupid Apps don’t

work!

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Dude! WTF?!?!

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The Horror! The Horror!

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

Surely you Tested?

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Romney 2012

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(Lack of) Speed Kills

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Active Queue Management

!!!!!Queues!!!!!!

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

Queues

Can you recover quickly?

Bufferbloat doesn’t matter, right?

Once up, can you deal with the backlog?

Back-pressure isn’t an issue, right?

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

Queues

Can you recover quickly?

Bufferbloat doesn’t matter, right?

Once up, can you deal with the backlog?

Back-pressure isn’t an issue, right?

NOPE

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

Programmable

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Active Queue Management

Behavioral

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Self Managed

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Queues

Queue Mgmt.

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Queues

Active Queue Mgmt.

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Something’s gotta give

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Tail Drop

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God(category – TCP/IP)

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Active Queue Management

RED

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Active Queue Management

RED

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Newark Airport

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FRED

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RED-PD

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Active Queue Management

Queues

RED in a different Light (1999)

http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.22.9406
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.22.9406
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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

Queues

CoDel

http://www.bufferbloat.net/
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Active Queue Management

What about Testing?

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Active Queue Management

What about Testing?

D-UH…

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Active Queue Management

The Bottom Line

Black swans will occur – Oh Yes!

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Bottom Line

Black swans will occur – Oh Yes!

You can only improve what you control

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Bottom Line

Black swans will occur – Oh Yes!

You can only improve what you control

Your business will define your discards

Page 57: Active Queue Management (for Cloud Services)

V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

The Bottom Line

Black swans will occur – Oh Yes!

You can only improve what you control

Your business will define your discards

Agility is (always!) your friend

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The Business

Beware the Black Swan

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V 1.0 © Ubiquiti Networks, Inc. All Rights Reserved

Active Queue Management

[email protected]

@dieswaytoofast

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You, apparently, forgot about me

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Free Calling

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No Voicemail

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“Active” Queue Management

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[email protected]

@dieswaytoofast


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