--- title: Linux 7.0 Wires Up Arm's 64-byte Single-Copy Atomic... description: Linux 7.0 adds support for ARM's 64-byte single-copy atomic instructions (LS64/LS64V) from Armv8.7, enabling userspace drivers to directly fill workqueue... canonical: https://daily.dev/posts/linux-7-0-wires-up-arm-s-64-byte-single-copy-atomic-instructions-ls64-ls64v-s6qvfmwph twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Linux 7.0 Wires Up Arm's 64-byte Single-Copy Atomic Instructions LS64/LS64V | daily.dev og:description: Linux 7.0 adds support for ARM's 64-byte single-copy atomic instructions (LS64/LS64V) from Armv8.7, enabling userspace drivers to directly fill workqueue... og:url: https://daily.dev/posts/linux-7-0-wires-up-arm-s-64-byte-single-copy-atomic-instructions-ls64-ls64v-s6qvfmwph og:image: https://api.daily.dev/og/posts/S6QvfmWpH.png og:image:alt: Linux 7.0 Wires Up Arm's 64-byte Single-Copy Atomic Instructions LS64/LS64V 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. # Linux 7.0 Wires Up Arm's 64-byte Single-Copy Atomic Instructions LS64/LS64V **[Phoronix](https://daily.dev/sources/phoronix)** · 1 min read · 0 upvotes · 0 comments ## Summary Linux 7.0 adds support for ARM's 64-byte single-copy atomic instructions (LS64/LS64V) from Armv8.7, enabling userspace drivers to directly fill workqueue entries into hardware. The kernel also includes Memory Tagging Extension (MTE) optimizations that reduce tag checking overhead, improving performance by 2% for futex operations and addressing 25-50% slowdowns in memcached workloads on AmpereOne machines with MTE enabled. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Linux 7.1 Lands Workaround For Arm C1-Pro Erratum](https://daily.dev/posts/linux-7-1-lands-workaround-for-arm-c1-pro-erratum-p9wxa3qmk) · Phoronix · 0 upvotes · 0 comments - [LoongArch Ready With New Features In Linux 7.0](https://daily.dev/posts/loongarch-ready-with-new-features-in-linux-7-0-1hfw6pdps) · Phoronix · 0 upvotes · 0 comments - [Main changes, Arm, RISC-V, and MIPS architectures](https://daily.dev/posts/main-changes-arm-risc-v-and-mips-architectures-eds3j61xx) · CNX Software · 0 upvotes · 0 comments - [Optimizing Arm-based Build Servers](https://daily.dev/posts/optimizing-arm-based-build-servers-rh07w05dm) · SitePoint · 1 upvotes · 0 comments --- Tags: [#performance](https://daily.dev/tags/performance), [#linux](https://daily.dev/tags/linux), [#arm](https://daily.dev/tags/arm) [View this post on daily.dev](https://daily.dev/posts/linux-7-0-wires-up-arm-s-64-byte-single-copy-atomic-instructions-ls64-ls64v-s6qvfmwph) ```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":"Linux 7.0 Wires Up Arm's 64-byte Single-Copy Atomic Instructions LS64/LS64V","url":"https://daily.dev/posts/linux-7-0-wires-up-arm-s-64-byte-single-copy-atomic-instructions-ls64-ls64v-s6qvfmwph","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/linux-7-0-wires-up-arm-s-64-byte-single-copy-atomic-instructions-ls64-ls64v-s6qvfmwph"},"datePublished":"2026-02-14T11:56:05.474Z","dateModified":"2026-02-14T11:56:53.484Z","description":"Linux 7.0 adds support for ARM's 64-byte single-copy atomic instructions (LS64/LS64V) from Armv8.7, enabling userspace drivers to directly fill workqueue...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/89834b49f20b7bcc19123969b93d344d?_a=AQAEunF","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/89834b49f20b7bcc19123969b93d344d?_a=AQAEunF","isAccessibleForFree":true,"articleSection":"Phoronix","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Phoronix","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/6a26ba379dd64932830aa0c9803dd7ee","url":"https://daily.dev/sources/phoronix"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/linux-7-0-wires-up-arm-s-64-byte-single-copy-atomic-instructions-ls64-ls64v-s6qvfmwph","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"performance,linux,arm","timeRequired":"PT1M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Phoronix","item":"https://daily.dev/sources/phoronix"},{"@type":"ListItem","position":3,"name":"Linux 7.0 Wires Up Arm's 64-byte Single-Copy Atomic Instructions LS64/LS64V"}]} ```