Deprecating scp [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! The scp command, which uses the SSH protocol to copy files between machines, is deeply wired into the fingers of many Linux users and developers — doubly
A block layer introduction part 1: the bio layer [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! One of the key values provided by an operating system like Linux is that it provides abstract interfaces to concrete devices. Though the original "charact
A new hash algorithm for Git [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! The Git source-code management system is famously built on the SHA‑1 hashing algorithm, which has become an increasingly weak foundation over the years. S
/dev/random - a new approach [LWN.net]
Hi Herbert, Ted, The venerable Linux /dev/random served users of cryptographic mechanisms well for a long time. Its behavior is well understood to deliver entropic data. In the last years, however, the Linux /dev/random showed signs of age where it has challenges to cope with modern computing environments ranging from tiny embedded systems, over new hardware resources such as SSDs, up to massive p
C11 atomic variables and the kernel [LWN.net]
Benefits for LWN subscribers The primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! The C11 standard added a number of new features for the C and C++ languages. One of those features — built-in atomic types — seems like it would naturall
The SO_REUSEPORT socket option [LWN.net]
This article brought to you by LWN subscribersSubscribers to LWN.net made this article — and everything that surrounds it — possible. If you appreciate our content, please buy a subscription and make the next set of articles possible. One of the features merged in the 3.9 development cycle was TCP and UDP support for the SO_REUSEPORT socket option; that support was implemented in a series of patch
Etcd and fleet [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! CoreOS is a Linux distribution designed for clustered server systems. It relies on a number of interesting technologies, including the Docker container sy
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Foo over UDP [LWN.net]
LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing Tunneling protocols are increasingly important in modern networking setups. By tying distant networks together, they enable the creation of virtual private networks, access to otherwise-firewalled ports, and more. Tunneling can happen at multiple level
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Supporting filesystems in persistent memory [LWN.net]
LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing For a few years now, we have been told that upcoming non-volatile memory (NVM) devices are going to change how we use our systems. These devices provide large amounts (possibly terabytes) of memory that is persistent and that can be accessed at RAM spe
MCS locks and qspinlocks [LWN.net]
Did you know...? LWN.net is a subscriber-supported publication; we rely on subscribers to keep the entire operation going. Please help out by buying a subscription and keeping LWN on the net. Impressive amounts of effort have gone into optimizing the kernel's low-level locking mechanisms over the years, but that does not mean that there is no room for improving their performance further. Some work
The multiqueue block layer [LWN.net]
Did you know...?LWN.net is a subscriber-supported publication; we rely on subscribers to keep the entire operation going. Please help out by buying a subscription and keeping LWN on the net. The kernel's block layer is charged with managing I/O to the system's block ("disk drive") devices. It was designed in an era when a high-performance drive could handle hundreds of I/O operations per second (I
RAPL (Running Average Power Limit) driver [LWN.net]
Zhang Rui <rui.zhang@intel.com>, Rafael Wysocki <rafael.j.wysocki@intel.com>, Len Brown <len.brown@intel.com>, Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>, Arjan van de Ven <arjan@linux.intel.com>, Jacob Pan <jacob.jun.pan@linux.intel.com> RAPL(Running Average Power Limit) interface provides platform software with the ability to monitor, control, and get notifications on SOC power co
Driver porting: Device model overview [LWN.net]
One of the more significant changes in the 2.5 development series is the creation of the integrated device model. The device model was originally intended to make power management tasks easier through the maintenance of a representation of the host system's hardware structure. A certain amount of mission creep has occurred, however, and the device model is now closely tied into a number of device
kobjects and sysfs [LWN.net]
In The Zen of Kobjects, this series looked at the kobject abstraction and the various interfaces that go with it. That article, however, glossed over one important part of the kobject structure (with a promise to fill in in later): its interface to the sysfs virtual filesystem. The time has come to fulfill our promise, however, and look at how sysfs works at the lower levels. To use the functions
OSTree for Fedora [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! Linux distributions are typically delivered either in piecemeal fashion via packages or as a single bundle like Android or Chrome OS. Colin Walters's OSTr
Thread summary: the Linux kernel and PostgreSQL [LWN.net]
Josh Berkus <josh-AT-agliodbs.com>, Joshua Drake <jd-AT-commandprompt.com>, Robert Haas <robertmhaas-AT-gmail.com>, Tom Lane <tgl-AT-sss.pgh.pa.us>, lsf-pc-AT-lists.linux-foundation.org, Magnus Hagander <magnus-AT-hagander.net>, Kevin Grittner <kgrittn-AT-ymail.com>, James Bottomley <James.Bottomley-AT-HansenPartnership.com>, Andres Freund <andres-AT-2ndquadrant.com>, Hannu Krosing <hannu-AT-2ndqu
The scheduler and hyperthreading [LWN.net]
Hyperthreading is a hardware technique where a single CPU behaves as if it were multiple (usually two) virtual processors. When one virtual processor stalls (on a cache miss, for example), the other runs. Hyperthreading can yield significant performance improvements (numbers of around 30% have been floated) for a very small silicon investment. And the software side is free: a hyperthreaded process
Is pre-linking worth it? [LWN.net]
Please consider subscribing to LWNSubscriptions are the lifeblood of LWN.net. If you appreciate this content and would like to see more of it, your subscription will help to ensure that LWN continues to thrive. Please visit this page to join up and keep LWN on the net. The recent problem with prelink in Fedora Rawhide has led some to wonder about what advantages pre-linking actually brings—and whe
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The road forward for systemd [LWN.net]
Merging lock elision into glibc [LWN.net]