--- title: Adjusting One Line Of Linux Code Yields 5x Wakeup... description: A proposed Linux kernel patch reduces CPU wakeup latency by 5x on modern Intel Xeon servers (Sapphire Rapids) by adjusting idle state prediction logic. The... canonical: https://daily.dev/posts/adjusting-one-line-of-linux-code-yields-5x-wakeup-latency-reduction-for-modern-xeon-cpus-nwx6tdyeo twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Adjusting One Line Of Linux Code Yields 5x Wakeup Latency Reduction For Modern Xeon CPUs | daily.dev og:description: A proposed Linux kernel patch reduces CPU wakeup latency by 5x on modern Intel Xeon servers (Sapphire Rapids) by adjusting idle state prediction logic. The... og:url: https://daily.dev/posts/adjusting-one-line-of-linux-code-yields-5x-wakeup-latency-reduction-for-modern-xeon-cpus-nwx6tdyeo og:image: https://api.daily.dev/og/posts/NWx6tDyeo.png og:image:alt: Adjusting One Line Of Linux Code Yields 5x Wakeup Latency Reduction For Modern Xeon CPUs 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. # Adjusting One Line Of Linux Code Yields 5x Wakeup Latency Reduction For Modern Xeon CPUs **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary A proposed Linux kernel patch reduces CPU wakeup latency by 5x on modern Intel Xeon servers (Sapphire Rapids) by adjusting idle state prediction logic. The one-line change adds a 25% safety margin to predicted idle duration instead of using the next timer value directly, preventing the governor from selecting overly deep C-states (PC6) when shallower states are more appropriate. Testing shows latency drops from 151μs to ~30μs on affected platforms while maintaining power efficiency, with no regression on older Ice Lake and Skylake systems. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Proposed Linux Patch For A Brief Delay To Match PCI Spec Will Hopefully Address Some Bugs](https://daily.dev/posts/proposed-linux-patch-for-a-brief-delay-to-match-pci-spec-will-hopefully-address-some-bugs-xlwgopxxv) · Phoronix · 0 upvotes · 0 comments - [One Giant Leap: 95% Less Sampling Cost](https://daily.dev/posts/one-giant-leap-95-less-sampling-cost-knpvkaex9) · Inside Java · 0 upvotes · 0 comments - [Linux 6.18-rc4 Fixes Another Performance Regression In The Power Management Code](https://daily.dev/posts/linux-6-18-rc4-fixes-another-performance-regression-in-the-power-management-code-npcqkliu4) · Phoronix · 0 upvotes · 0 comments - [How a 40-Line Fix Eliminated a 400x Performance Gap](https://daily.dev/posts/how-a-40-line-fix-eliminated-a-400x-performance-gap-knjx43zh3) · Hacker News · 1 upvotes · 0 comments --- Tags: [#performance](https://daily.dev/tags/performance), [#linux](https://daily.dev/tags/linux), [#computing](https://daily.dev/tags/computing), [#intel](https://daily.dev/tags/intel) [View this post on daily.dev](https://daily.dev/posts/adjusting-one-line-of-linux-code-yields-5x-wakeup-latency-reduction-for-modern-xeon-cpus-nwx6tdyeo) ```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":"Adjusting One Line Of Linux Code Yields 5x Wakeup Latency Reduction For Modern Xeon CPUs","url":"https://daily.dev/posts/adjusting-one-line-of-linux-code-yields-5x-wakeup-latency-reduction-for-modern-xeon-cpus-nwx6tdyeo","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/adjusting-one-line-of-linux-code-yields-5x-wakeup-latency-reduction-for-modern-xeon-cpus-nwx6tdyeo"},"datePublished":"2026-01-21T11:29:37.281Z","dateModified":"2026-01-21T11:30:31.480Z","description":"A proposed Linux kernel patch reduces CPU wakeup latency by 5x on modern Intel Xeon servers (Sapphire Rapids) by adjusting idle state prediction logic. 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