New Internet Standard L4S: the Quiet Plan to Make the Internet Feel Faster

Slow load times? Choppy videos? The real problem is latency, writes the Verge — but the good news is "there's a plan to almost eliminate latency, and big companies like Apple, Google, Comcast, Charter, Nvidia, Valve, Nokia, Ericsson, T-Mobile parent company Deutsche Telekom, and more have shown an interest."

It's a new internet standard called L4S that was finalized and published in January, and it could put a serious dent in the amount of time we spend waiting around for webpages or streams to load and cut down on glitches in video calls. It could also help change the way we think about internet speed and help developers create applications that just aren't possible with the current realities of the internet... L4S stands for Low Latency, Low Loss, Scalable Throughput, and its goal is to make sure your packets spend as little time needlessly waiting in line as possible by reducing the need for queuing. To do this, it works on making the latency feedback loop shorter; when congestion starts happening, L4S means your devices find out about it almost immediately and can start doing something to fix the problem. Usually, that means backing off slightly on how much data they're sending... [L4S] makes it easier to maintain a good amount of data throughput without adding latency that increases the amount of time it takes for data to be transferred...

If you really want to get into it (and you know a lot about networking), you can read the specification paper on the Internet Engineering Task Force's website... The L4S standard adds an indicator to packets, which says whether they experienced congestion on their journey from one device to another. If they sail right on through, there's no problem, and nothing happens. But if they have to wait in a queue for more than a specified amount of time, they get marked as having experienced congestion. That way, the devices can start making adjustments immediately to keep the congestion from getting worse and to potentially eliminate it altogether... In terms of reducing latency on the internet, L4S or something like it is "a pretty necessary thing," according to Greg White, a technologist at research and development firm CableLabs who helped work on the standard. "This buffering delay typically has been hundreds of milliseconds to even thousands of milliseconds in some cases. Some of the earlier fixes to buffer bloat brought that down into the tens of milliseconds, but L4S brings that down to single-digit milliseconds...."

Here's the bad news: for the most part, L4S isn't in use in the wild yet. However, there are some big names involved with developing it... When we spoke to Greg White from CableLabs, he said there were already around 20 cable modems that support it today and that several ISPs like Comcast, Charter, and Virgin Media have participated in events meant to test how prerelease hardware and software work with L4S. Companies like Nokia, Vodafone, and Google have also attended, so there definitely seems to be some interest. Apple put an even bigger spotlight on L4S at WWDC 2023 after including beta support for it in iOS 16 and macOS Ventura... At around the same time as WWDC, Comcast announced the industry's first L4S field trials in collaboration with Apple, Nvidia, and Valve. That way, content providers can mark their traffic (like Nvidia's GeForce Now game streaming), and customers in the trial markets with compatible hardware like the Xfinity 10G Gateway XB7 / XB8, Arris S33, or Netgear CM1000v2 gateway can experience it right now...
The other factor helping L4S is that it's broadly compatible with the congestion control systems in use today...

Read more of this story at Slashdot.