--- title: Highlights: Multi-Threaded Routing Daemons « ipSpace.net... description: A curated collection of expert commentary on multi-threaded routing daemon implementations, sparked by a prior blog post. Industry veterans including Jeff... canonical: https://daily.dev/posts/highlights-multi-threaded-routing-daemons-ipspace-net-blog-ek2uq1l8m twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Highlights: Multi-Threaded Routing Daemons « ipSpace.net blog | daily.dev og:description: A curated collection of expert commentary on multi-threaded routing daemon implementations, sparked by a prior blog post. Industry veterans including Jeff... og:url: https://daily.dev/posts/highlights-multi-threaded-routing-daemons-ipspace-net-blog-ek2uq1l8m og:image: https://api.daily.dev/og/posts/EK2uQ1L8M.png og:image:alt: Highlights: Multi-Threaded Routing Daemons « ipSpace.net blog og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Highlights: Multi-Threaded Routing Daemons « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 7 min read · 0 upvotes · 0 comments ## Summary A curated collection of expert commentary on multi-threaded routing daemon implementations, sparked by a prior blog post. Industry veterans including Jeff Tantsura, Dr. Tony Przygienda, Henk Smit, and others weigh in on the genuine difficulty of parallelizing routing protocol software. Key themes include: all modern routing implementations have some threading but true massive multi-threading at scale remains unsolved; moving to multi-threaded code in the early 2010s took years and caused hundreds of bugs; BGP implementations have seen little architectural improvement in 20 years; FIB download and installation time is arguably the biggest bottleneck, not the control plane; and OS scheduler centralization, inter-thread synchronization overhead, and compiler limitations all compound the problem at high core counts. The consensus is that significant improvement in BGP implementation quality is unlikely in the near term. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why is it so hard to make BGP daemons fully multi-threaded at scale? Full multi-threading of BGP requires parallelizing ingress policy, best-path computation, RIB installation, egress policy, and update generation across many cores. Some stages require locking or must remain single-threaded (e.g., installing routes into Adj-RIB-In). Beyond that, inter-thread synchronization overhead and OS scheduler inefficiency cause performance to peak and then degrade as more cores are added, and the massive existing codebases make architectural refactoring extremely risky. _Developers navigating BGP scalability trade-offs find the ongoing expert debate on daily.dev._ ### What is the biggest performance bottleneck in modern routers — control plane or FIB download? FIB download and installation time is the biggest bottleneck in modern routers, not the control plane. This problem has been known for over a decade and grows exponentially worse as the number of routes increases. At million-route scale or higher, FIB insertion latency becomes the most painful part of the problem, and approaches like Juniper's RIB sharding may or may not help. _Engineers working at high route-count scale track developments like RIB sharding on daily.dev._ ## Similar posts on daily.dev - [Faster than Dijkstra?](https://daily.dev/posts/faster-than-dijkstra--luk6oiopf) · Hacker News · 3 upvotes · 0 comments - [The Staggering Complexity And Subtlety Of Concurrency](https://daily.dev/posts/the-staggering-complexity-and-subtlety-of-concurrency-e4mpqhp2q) · Hackaday · 1 upvotes · 0 comments - [Your Distributed System Is Slower Than a Laptop. You Just Don't Know It Yet., CodeGood](https://daily.dev/posts/your-distributed-system-is-slower-than-a-laptop-you-just-don-t-know-it-yet-codegood-w0xn0std3) · CodeGood · 3 upvotes · 0 comments --- Tags: [#bgp](https://daily.dev/tags/bgp) [View this post on daily.dev](https://daily.dev/posts/highlights-multi-threaded-routing-daemons-ipspace-net-blog-ek2uq1l8m) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Highlights: Multi-Threaded Routing Daemons « ipSpace.net blog","url":"https://daily.dev/posts/highlights-multi-threaded-routing-daemons-ipspace-net-blog-ek2uq1l8m","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/highlights-multi-threaded-routing-daemons-ipspace-net-blog-ek2uq1l8m"},"datePublished":"2026-08-11T08:52:21.200Z","dateModified":"2026-08-11T08:59:47.843Z","description":"A curated collection of expert commentary on multi-threaded routing daemon implementations, sparked by a prior blog post. 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