Runnable userspace meta program

Over the last four years the author has searched for means and methods to keep software up to date with minimum downtime and inconvenience for users and maximum consistency. The result is a model which combines the strength of NanoBSD, ZFS and jails to build servers where application upgrades result in downtime of only a few seconds and kernel upgrades only need the time to reboot without installing in tampering with the running system.

This system is in production now for several months on about 10 servers at five different sites. The growing number of appliances built using NanoBSD inspired him to adapt some of the NanoBSD technology to servers in order to make them easier to administer and upgrade. These two protocols are used jointly for translation from IPv6 clients to IPv4 servers.

Simon Perreault is the main author of Ecdysis. He holds an M. BSD-based operating systems implement device drivers in kernel mode for historical, performance, and simplicity reasons.

In this paper we extend the Runnable Userspace Meta Program rump paradigm of running unmodified kernel code directly in a userspace process to kernel device drivers. Support is available for pseudo device drivers e. Use cases include driver development, regression testing, safe execution of untrusted drivers, execution on foreign operating systems, and more.

The design and NetBSD implementation along with the current status and future directions are discussed. At the time of writing, SMP support is working and has been merged into the main tree. A frank discussion of architectural and aesthetic flaws but not bugs in the standard BSD packet filter. Some of these are largely internal, code-related issues: internal data structures, code readability and maintainability, etc.

Others have their roots in design tradeoffs: syntactic richness vs. Resolving many of the issues is a challenge, especially since the OpenBSD project flavors "evolutionary" over "revolutionary" change. To illustrate the approach taken, the talk will include a closer look at the recently completed state-table restructuring, mostly finalised in the upcoming 4. Ryan has years of experience wearing a suit in the Information Systems industry, working with public, private, and non-profit organisations ranging in size from small office to "Fortune 50".

In this talk, we will present an overview of the features and common problems of microprocessor system hardware monitors as they relate to the topic of silent computing. In a nutshell, the topic of programmable fan control will be explored. A live demonstration of the fan-controlling prototype might be possible. Silent computing is an important subject as its practice reduces the amount of unnecessary stress and improves the motivation of the workforce, at home and in the office.

Attendees will gain knowledge on how to effectively programme the chips to minimise fan noise without impeding reliability or causing any system failures, as well as some basic principles regarding the practice of quiet computing.

Depending on the availability of the author, patches for systems other than OpenBSD may also be made available. Constantine A. Murenin is an MMath graduate student at the David R. Active member of multiple open-source projects and a Google Summer of Code Alumnus, Constantine's interests range from standards compliance and usability at all levels, to quiet computing and hardware monitoring.

With the advent of low cost wireless chipsets, wireless mesh networks became much more attractive for both companies, governments, and the general consumer. Wireless mesh networks are being used extensively since the popularization of the Since Later, the amendment also included provisions for mesh authentication, encryption, link management, bridging mesh networks with other types of networks, and channel reservation.

This paper will talk about the FreeBSD implementation of His interests in operating system development range from low level platform support to networking in general. As the proliferation, reliance and importance of rich digital formats have increased over the years, so have demands on data storage capacity. However, backup technologies have not kept up with this trend. The traditional time stamp based towers of Hanoi backup methodology cannot handle the sheer volume of data and backup windows have been significantly reduced due to the 24 hour online economy.

This methodology also backs up the same content repeatedly, even if the content has not changed. This results in a flood of data transfer that can overwhelm networks and other critical resources. Over the same period of time disk technology has progressed in leaps and bounds, both in performance and more importantly, in reliability. In comparison to disks, tape technologies are still comparatively slow and the media tends to deteriorate over time.

Additionally, there are the future hardware compatibility issues of trying to match a degraded tape to a working tape drive, not to mention the physical issues such as offline labeling and physical storage. To work around these issues several new backup and archival paradigms have been developed however, these are mostly out of reach of the open source community due to cost and licensing issues.

After years of patching and hacking he decided to look for alternatives that suited his needs better and became interested in the OpenBSD project in He now works all over the tree scratching whatever itches. He works for a large computer manufacturer in central Texas as a Sr.

His work has been concentrated on a wide range of server and storage products. In his spare time he enjoys hacking the OpenBSD kernel around a busy social schedule. In this talk we will discuss the process of porting these types of applications and issues encountered while maintaining these tools. In addition to generally issues of porting code from one Unix-like operating system to another, there are several type of porting common to many HPC infrastructure codes which we will explore. Beyond porting, we will discuss how the ports collection aids our use of HPC applications and ways we think overall integration could be improved.

His computing interests include high performance computing, networking, security, mobility, and, of course, finding ways to use FreeBSD in all these areas. When not computing, he enjoys reading, cooking, brewing, trying to introduce people to the pleasures of Slow Food, and pounding on red-hot iron in his garage blacksmith shop. RAIDframe has not been synchronized with the upstream codebase for years and has never been enabled by default. In the OpenBSD project that translates to unsupported code.

The only work done on RAIDframe was an occasional change to ensure that it still compiles. The RAIDframe code base is large, complex and intended for research purposes. The ccd 4 stack is enabled by default but has also not seen any significant change or update in years.

The implementation is bare-bones and its use is complex and error prone. This results in the need for implementation specific tools rather than using system defaults such as bioctl 8 5, the tool normally used for RAID management. The BSD family has always been very well known for its robust network stack, hence it has been widely used in many different fields and applications. Rather, it provides very lightweight virtualization of the service subcomponents of the OS. For example, the NetBSD kernel contains drivers to interpret various file systems.

To be usable, this driver code must be inside the kernel. In practise, this means that support must be compiled into the kernel or it must be loaded as a kernel module.

In rump, the kernel code is contained in a user process. Reading and writing the contents of a file system is possible even without kernel support for that type of file system. The key difference to other usermode file systems is that rump file systems reuse the kernel file system code and modules can be interchangeably used in the kernel or in userspace. The key difference to in-kernel file system drivers is isolation from the rest of the kernel. It is also possible to provide multiple versions of the same kernel file system driver.

Although rump is a virtualization technology, it does not seek to replace the Xen virtualization present in NetBSD 5. Rather, Xen and rump should be seen as complementary technologies which each have their own strengths and weaknesses. For example, the setup of Xen from scratch for a one-off debugging task is heavyweight and time consuming, while using rump introduces no setup penalty. Many projects reimplement file system code for users Documents: Advanced Search Include Citations.

Authors: Advanced Search Include Citations. Venue: In Proc. Results 1 - 1 of 1. When kernel functionality is desired in userspace, the common approach is to reimplement it for userspace interfaces.