Contemporary networking hardware can move a lot of packets, to the point that the host computer can have a hard time keeping up. In recent years, CPU speeds have stopped increasing, but the number of CPU cores is growing. The implication is clear: if the networking stack is to be able to keep up with the hardware, smarter processing (such as generic receive offload) will not be enough; the system
LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing Making the best use of available memory is one of the biggest challenges for any operating system. Throwing virtualization into the mix adds both new challenges (balancing memory use between guests, for example) and opportunities (sharing pages between
An I/O controller is a system component intended to arbitrate access to block storage devices; it should ensure that different groups of processes get specific levels of access according to a policy defined by the system administrator. In other words, it prevents I/O-intensive processes from hogging the disk. This feature can be useful on just about any kind of system which experiences disk conten
One might think that the ext3 filesystem, by virtue of being standard on almost all installed Linux systems for some years now, would be reasonably well tuned for performance. Recent events have shown, though, that some performance problems remain in ext3, especially in places where the fsync() system call is used. It's impressive what can happen when attention is drawn to a problem; the 2.6.30 ke
LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing Three weeks ago, LWN looked at the renewed interest in dynamic tracing, with an emphasis on SystemTap. Tracing is a perennial presence on end-user wishlists; it remains a handy tool for companies like Sun Microsystems, which wish to show that their off
Arjan van de Ven's fast boot project will be familiar to most LWN readers by now. Most of Arjan's work has not yet found its way into the mainline, though, so most of us still have to wait for our systems to boot the slow way. That said, the 2.6.29 kernel will contain one piece of the fast boot work, in the form of the asynchronous function call infrastructure. Users will need to know where to fin
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. Virtualized guests running under Linux like to think that they are doing their own memory management. The truth of the matter, tho
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 capabilities have had a long and somewhat tortuous journey as part of the Linux kernel. Slowly—and very carefully—functionality is being added to th
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. "Containers" are a form of lightweight virtualization as represented by projects like OpenVZ. While virtualization creates a new v
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