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Alibaba Eyes Linux CPU Scheduler Changes To Better Handle QEMU With SMT/HT Threads

There is a phenomenon where running a multi-threaded workload inside a virtual machine (VM) with Simultaneously Multi-Threading (SMT / Intel Hyper Threading) that a sibling thread could find itself busy while the CPU core is idle ....

Peter Zijlstra , Simultaneously Multi Threading , Intel Hyper Threading ,

Linux kCFI/FineIBT Weaknesses Addressed By Rewriting Some Assembly In C

Ahead of the Linux 6.5-rc2 release tomorrow there was a set of x86/x86 64 kernel changes merged overnight to deal with some weaknesses in the kernel's Control Flow Integrity (kCFI) / FineIBT (Indirect Branch Tracking) code. ....

Peter Zijlstra , Cfi Fineibt Indirect Branch , Intel Indirect Branch , Show Your Support , Control Flow Integrity , Indirect Branch Tracking , Indirect Branch ,

Scope-Based Resource Management Infrastructure Merged For Linux 6.5

Here comes a very exciting addition to the Linux 6.5 kernel: the initial infrastructure has landed for scope-based resource management. ....

Peter Zijlstra , Show Your Support , Phoronix Premium , Inux Hardware Reviews , Inux Hardware Benchmarks , Inux Server Benchmarks , Inux Benchmarking , Esktop Linux , Inux Performance , Pen Source Graphics , Inux How To , Buntu Benchmarks , Buntu Hardware , Horonix Test Suite ,

Scope-based resource management for the kernel [LWN.net]

Scope-based resource management for the kernel [LWN.net]
lwn.net - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from lwn.net Daily Mail and Mail on Sunday newspapers.

Linus Torvalds , Peter Zijlstra , Jonathan Corbet ,

Red Hat Aiming To Address IBRS Mitigation Still Being Too Costly On Performance

Red Hat engineers are working to deal with Indirect Branch Restricted Speculation (IBRS) being too costly for mitigating Spectre V2 and Retbleed on older Intel Xeon Scalable processors ....

Peter Zijlstra , Red Hat , Data Plane Development Kit , Indirect Branch Restricted Speculation , Show Your Support , Intel Xeon Scalable , Red Hat Enterprise Linux , Waiman Long , Intel Xeon , Xeon Scalable Skylake , Intel Linux , Call Depth , Call Depth Tracking , Intel Skylake ,