Context switches much slower in new linux kernels
We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to believe. Let me be more specific about the test. We have a program that runs two threads. The first threa
Configuring and Tuning HP ProLiant Servers for Low-Latency Applications White Paper
Configuring and Tuning HP ProLiant Servers for Low-Latency Applications White Paper Abstract This document is intended to assist HP customers in configuring, tuning, and optimizing HP ProLiant servers for ultra low-latency applications. Part Number: 581608-005 April 2013 Edition: 5 © Copyright 2009, 2013 Hewlett-Packard Development Company, L.P. The information contained herein is subject to chan
paper.dvi
How to cope with the negative impact of a processor’s energy-saving features on real-time capabilities? Carsten Emde Open Source Automation Development Lab (OSADL) eG Aichhalder Str. 39, 78713 Schramberg, Germany C.Emde@osadl.org Abstract In the early days of using computers for determinism-critical tasks, processors mostly were suitable for this purpose, since instruction execution was in sync wi
breakage.org - このウェブサイトは販売用です！ - breakage リソースおよび情報
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Deeper C states and increased latency
Today it is common to describe processor power consumption and thermal management state by CX, states where X can be number 0 to n (n depends on the CPU type). In the C0 state the CPU is running. In C-states higher than 0 the CPU is stopped (sleeps). Higher C states means more power savings but also longer delay when returning to C0 (higher latency). ACPI specification describes C0 - C3, but recen
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