Can anybody summarize the talk for folks like me who for several reasons cannot watch the video?
I'd like to complement this comment and suggest that this practice should be applied to links that may be blocked to a grand part of us, people that are behind a firewall.
Not trying to be a wet blanket, but there's nothing really groundbreaking in this talk. It's pretty basic stuff that everyone else running L3 networks already does. I'd be much more interested in a talk that is solely on proxygen. I'd also like to know their fragmentation rate is between the L4 and L7 LB's. I know what ours is, but I'm sure FB takes a lot more large uploads than we do. Fragmentation is the downside t…
This stuff seems basic at first glance, but it's not easy to get right, and you're discounting a ton of effort that went into getting feedback loops and demand prediction to work properly in Cartographer for example. Maybe it's easy to slap together L4/L7 LB and throw a DNS server in front of it at smaller scales, but it's a notable accomplishment to do this at Facebook's scale. Nothing out there approaches Facebook'…
You'll get fragmentation on every segment over 1460 bytes, which would be the majority of datagrams for a large file upload like pictures or movies. Only way to work around this is to run jumbo frames from L4 to L7. You can't magically encapsulate IP in IP at 1460 segments without fragmenting.
Hi All! Thanks for the comments here. The video for this same (more recent) talk at SRECon Europe 2015 is up and it is much higher quality. I have iterated on the presentation with feedback I got since giving this in February. Enjoy!