Notes on BPF (2) - BPF helper functions Oracle Linux kernel developer Alan Maguire presents this six-part series on BPF, wherein he presents an in depth look at...
Notes on BPF (2) - BPF helper functions Oracle Linux kernel developer Alan Maguire presents this six-part series on BPF, wherein he presents an in depth look at the kernel's "Berkeley Packet Filter" -- a useful and extensible kernel function for much more than packet filtering. Now that we have a list of program types, what can we do within programs we attach? A good place to start with writing BPF programs is to see what helper functions the various BPF program types have...
Notes on BPF (2) - BPF helper functions Oracle Linux kernel developer Alan Maguire presents this six-part series on BPF, wherein he presents an in depth look at the kernel's "Berkeley Packet Filter"...
Notes on BPF (1) - A Tour of Progam Types Oracle Linux kernel developer Alan Maguire presents this six-part series on BPF, wherein he presents an in depth look...
Notes on BPF (1) - A Tour of Progam Types Oracle Linux kernel developer Alan Maguire presents this six-part series on BPF, wherein he presents an in depth look at the kernel's "Berkeley Packet Filter" -- a useful and extensible kernel function for much more than packet filtering. If you follow Linux kernel development discussions and blog posts, you've probably heard BPF mentioned a lot lately. It's being used for high-performance load-balancing, DDoS mitigation and...
Notes on BPF (1) - A Tour of Progam Types Oracle Linux kernel developer Alan Maguire presents this six-part series on BPF, wherein he presents an in depth look at the kernel's "Berkeley Packet Filter"...
Dhaval Giani, an Oracle Linux kernel developer and development manager, shares some of his thoughts and insights from Linux Plumbers Conference 2018. This is my...
Dhaval Giani, an Oracle Linux kernel developer and development manager, shares some of his thoughts and insights from Linux Plumbers Conference 2018. This is my report from LPC 2018 held in Vancouver, BC on November 13-15, 2018. Oracle had a strong presence at LPC this year. I counted at least 20 of us (so ~4% of the conference attendees). Like last year, I organized the Testing and Fuzzing microconference. It was a popular microconference (I counted over 100 attendees at...
Dhaval Giani, an Oracle Linux kernel developer and development manager, shares some of his thoughts and insights from Linux Plumbers Conference 2018. This is my report from LPC 2018 held in Vancouver,...
Load balancing via scalable task stealing Oracle Linux kernel developer Steve Sistare contributes this discussion on kernel scheduler improvements. The Linux...
Load balancing via scalable task stealing Oracle Linux kernel developer Steve Sistare contributes this discussion on kernel scheduler improvements. The Linux task scheduler balances load across a system by pushing waking tasks to idle CPUs, and by pulling tasks from busy CPUs when a CPU becomes idle. Efficient scaling is a challenge on both the push and pull sides on large systems. For pulls, the scheduler searches all CPUs in successively larger domains until an overloaded...
Load balancing via scalable task stealing Oracle Linux kernel developer Steve Sistare contributes this discussion on kernel scheduler improvements. The Linux task scheduler balances load across a...
Linux kernel developer Tom Hromatka has been working in the area of seccomp looking to improve performance of large seccomp filters. Background Seccomp is a...
Linux kernel developer Tom Hromatka has been working in the area of seccomp looking to improve performance of large seccomp filters. Background Seccomp is a critical component to safely isolate and secure containers by restricting the syscalls that a container is allowed to invoke. In a nod to the many security threats that have arisen lately, current seccomp best practices are to create a (typically large) whitelist of allowed syscalls. This is safer than a small blacklist...
Linux kernel developer Tom Hromatka has been working in the area of seccomp looking to improve performance of large seccomp filters. Background Seccomp is a critical component to safely isolate...
Scalability and Performance Microconference at LPC 2018 This year at the Linux Plumbers Conference, Oracle Linux developer Daniel Jordan co-organized the...
Scalability and Performance Microconference at LPC 2018 This year at the Linux Plumbers Conference, Oracle Linux developer Daniel Jordan co-organized the performance and scalability microconference along with Pasha Tatashin from Microsoft and Ying Huang from Intel. The event had nine speakers, about half of whom were from Oracle, so this was a nice opportunity for our team to raise its concerns with the community. Daniel contributes this writeup on the challenges and...
Scalability and Performance Microconference at LPC 2018 This year at the Linux Plumbers Conference, Oracle Linux developer Daniel Jordan co-organized the performance and scalability...
Oracle Linux developer Subhra Mazumdar has been working on scalability improvements in the Linux scheduler. In this blog post, he talks about some of his latest...
Oracle Linux developer Subhra Mazumdar has been working on scalability improvements in the Linux scheduler. In this blog post, he talks about some of his latest work. At Oracle, we run big database workloads which are very susceptible to how the OS chooses to schedule threads. Spending too much time in the scheduler to select a CPU can translate to higher transaction latency (at a given throughput) or lower maximum achievable transaction throughput in TPC-C workloads. In this...
Oracle Linux developer Subhra Mazumdar has been working on scalability improvements in the Linux scheduler. In this blog post, he talks about some of his latest work. At Oracle, we run big database...
Oracle Linux developer Chuck Lever has been collaborating on an internet draft standard to bring transparent, end-to-end encryption for NFS (actually, all...
Oracle Linux developer Chuck Lever has been collaborating on an internet draft standard to bring transparent, end-to-end encryption for NFS (actually, all RPC-based protocols) in this new internet draft. As more Linux workloads traverse shared network infrastructure, we have seen an uptick in requests for encryption for network traffic. While there are many ways to do point-to-point traffic encryption, leading members of the Linux NFS community have proposed a different, and...
Oracle Linux developer Chuck Lever has been collaborating on an internet draft standard to bring transparent, end-to-end encryption for NFS (actually, all RPC-based protocols) in this new...
Making kernel tasks faster with ktask, an update Kernel developer Daniel Jordan got a nice writeup on lwn.net for his work on ktask. Daniel wrote a blog post...
Making kernel tasks faster with ktask, an update Kernel developer Daniel Jordan got a nice writeup on lwn.net for his work on ktask. Daniel wrote a blog post about ktask when the first version of this work was submitted to the Linux kernel community. Since then, the code has evolved to cover many additional dimensions in order to help it integrate with other systems. LWN.net subscribers can learn more in this recent writeup on the evolution of ktask. Ktask is a generic...
Making kernel tasks faster with ktask, an update Kernel developer Daniel Jordan got a nice writeup on lwn.net for his work on ktask. Daniel wrote a blog post about ktask when the first version of...
