Dave Taht’s Post

So apparently, #FQ_CoDel was 12 years old on May 14! Thanks for sharing this at one of the #bufferbloat mailing lists, Rich Brown: “My calendar reminds me that fq_codel is TWELVE YEARS OLD today! Dave Täht announced a testable version on the CeroWrt list at: https://lnkd.in/dpu_dKwb Since then, #FQCoDel, #sch_CAKE, TX Queues, AQL, ATF, and cake-autorate have all made their way into good products. (See https://lnkd.in/dmZzMZ39 for details.) Congratulations, everyone!” “I would never have imagined it would have taken this long for 300 lines of code to propagate across the planet.” Dave Taht Kudos to everyone that worked on #RFC8290: #TokeHoilandJorgensen, Paul McKenney, #DaveTaht, Jim Gettys, Eric Dumazet and everyone else, that helped to continue this work… https://lnkd.in/daqDqxAm #latency #jitter #OpenWrt #FLOSS #OpenSource #schCAKE #JonathanMorton #VanJacobson #KathleenNichols #JimGettys #EricDumazet #PaulMcKenney

This is how Comcast has been gaming Ookla speed test data for decades. https://lnkd.in/ehuiwqfb

#LibreQoS Adoption Worldwide: 🇺🇸 (22 states) 🇵🇭🇭🇰🇨🇦🇵🇱🇩🇴🇬🇭🇨🇿🇿🇦🇨🇴🇳🇿🇻🇪🇳🇦🇱🇹🇬🇧🇧🇷🇱🇻🇸🇬🇮🇹🇷🇺🇦🇺🇦🇷🇨🇾🇭🇺 🇮🇩🇲🇼🇲🇽🇵🇰🇹🇷🇬🇹🇮🇳🇱🇾🇨🇭🇨🇳🇩🇪🇪🇬🇬🇷🇮🇱 🇱🇧🇸🇦🇹🇭🇹🇳🇹🇼 and counting! Give it a try: libreqos.io We are really thankful to NLnet foundation & Equinix (thanks, Edward Vielmetti!) for grants & support, as well as to amazing folks at The Zulip Open Source Project / Kandra Labs, Inc. (creators of Zulip) for helping us communicate. #QoE #bufferbloat #latency #jitter #WISP #ISP #broadband #FLOSS #OpenSource #FWA #FISP #NLnet #Equinix #Zulip #QualityOfExperience

Tom Wheeler's pro-Title II post on the Brookings blog is embarrassing. After 40 years in telecom he still doesn't understand what net neutrality is about. Wheeler supports his own Internet regulations https://lnkd.in/gDySGDKS

I often hear "Latency only matters to gamers and future opportunities, such as industrial IOT / machine communication" However - every present connected experience is governed by latency. Latency is one of the most misunderstood concepts in our industry. The impact of high round trip latency for “simple” use cases like web browsing is MUCH greater than people expect. DNS, TCP, TLS, QUIC - these all rely on round trips for protocol establishment. Often overlooked though is how slow start (Hystart++) and congestion control (Cubic/BBR/Prague) algorithms are impacted. However - no matter how well we model the impact, "feeling" the impact of latency is one of the most helpful illustrations. Using one of my favorite tools - WebPageTest by Catchpoint from Catchpoint, I setup an experiment loading Speedtest.net on a symmetric gigabit connection - one with native latency, and one with 500ms added latency. One can see the impact - it is over 10 seconds slower to load the webpage! The average person has an attention span of ~2 seconds. Unexpected latency on a network causes flow abandonment, revenue loss, and frustrated customers. We have hit sufficient bandwidth in many areas of the world - it's time to focus on the next problems for present use cases; driving the reduction of latency to realize significant improvements in the quality of experience. Footnotes - 1. 500ms latency is common to observe in the wild. On average, we see over 600ms globally for latency under load, and often times I've seen over 2,000ms for poorly tuned buffers. #5G #FWA has large opportunities in this space. SpaceX Starlink recently cut their P99 latency by >60% through buffer tuning and the upstream work of Dave Taht. 2. The great work done by Jason Livingood in promoting L4S at scale will help improve latency consistency, but we as an industry need to work together to deploy support. 3. #CDN's often pass through content when a stateful cookie is included to prevent cache poisoning - while the CDN might have hot TCP pipes to the origin and termination is nearby the user, the content may still be thousands of miles (and hundreds of milliseconds) away. #FTTH #Wifi #Networking #Travel

Bufferbloat measure from the Cloud Native Rejekts network at ESpot in Paris, of interest to folks who watch such things like LibreQoS and Dave Taht. Lots of folks here using the net between talks. I think the hardware here is Zyxel based on the splash screen on the router. It's a fun venue but the wifi here has been a bit of a challenge for some talks. I think the game systems here are hardwired rather than going over wifi. The plan is to do a similar measure at the #kubecon2024 venue.