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Paper Q&A The Marvin Attack is a return of a 25 year old vulnerability that allows performing RSA decryption and signing operations as an attacker with the ability to observe only the time of the decryption operation performed with the private key. In 1998, Daniel Bleichenbacher discovered that the error messages given by SSL servers for errors in the PKCS #1 v1.5 padding allowed an adaptive-chose
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Performance of TRIM command on ext4 filesystem PostMark test Parametres of the Postmark test set number 50000 set transactions 50000 set read 4096 set write 4096 set bias read 5 set bias create 5 set report terse set size 1000 200000 set buffering true|false I have run this particular test on ext4 filesystem with -o nodiscard and -o discard mount options 10x with each mount option, then I have com
Performance Tuning Red Hat Enterprise Linux 6 Jeremy Eder, Sr. Software Engineer Performance Engineering Jeremy Eder2 Agenda Jeremy Eder3 (Real) Agenda... Performance Tuning Theory RHEL6 Performance Improvements tuned cgroups Architecture and Deep-dive CPU Performance Tuning/Power Management Memory/NUMA Performance Tuning Network Performance Tuning Jeremy Eder4 Performance Tuning Fo
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virt-what is a shell script which can be used to detect if the program is running in a virtual machine. virt-what supports a very large number of different hypervisor types, including common open source hypervisors (KVM, Xen, QEMU, VirtualBox), mainframe systems like IBM Systemz, LPAR, z/VM, hardware partitioning schemes like Hitachi Virtage, proprietary hypervisors like VMWare, Microsoft Hyper-V
Getting Started with InfiniBand The first step to using a new infiniband based network is to get the right packages installed. These are the infiniband related packages we ship and what they are there for (Note, the Fedora packages have not all been built or pushed to the repos yet, so their mention here is as a "Coming soon" variety, not an already done variety): openib - The base package that in
Table of Contents Introduction The Graph View Zooming In Zooming Out Graph Markers Graph Cursor Graph Plots Task Plots CPU Plots The List View Selecting an event Graph follows toggle Filters Task Filter Event Filter Advance Event Filter Introduction KernelShark is a front end reader of trace-cmd(1) output. "trace-cmd record" and "trace-cmd extract" create a trace.dat (trace-cmd.dat(5)) file. kerne
What Every Programmer Should Know About Memory Ulrich Drepper Red Hat, Inc. drepper@redhat.com November 21, 2007 Abstract As CPU cores become both faster and more numerous, the limiting factor for most programs is now, and will be for some time, memory access. Hardware designers have come up with ever more sophisticated memory handling and acceleration techniques–such as CPU caches–but these canno
Introduction A sample deployment Variations Distribution Conclusions Introduction Systems management has received little attention in the Linux world so far: we have very good tools to manage packages, make package installation and update as painless as possible, and provision systems to a specified state. But to truly deserve the label 'systems management', a lot more is needed: managing packages
D r a f t Prelink Jakub Jelı́nek Red Hat, Inc. jakub@redhat.com March 4, 2004 Abstract Prelink is a tool designed to speed up dynamic linking of ELF programs on various Linux architectures. It speeds up start up of OpenOffice.org 1.1 by 1.8s from 5.5s on 651MHz Pentium III. 1 Preface In 1995, Linux changed its binary format from a.out to ELF. The a.out binary format was very inflexible and shared
D r a f t The Native POSIX Thread Library for Linux Ulrich Drepper Red Hat, Inc. drepper@redhat.com Ingo Molnar Red Hat, Inc. mingo@redhat.com February 21, 2005 This document is completely, utterly out of date when it comes to descriptions of the limitations of the current implementation. Everybody referring to this document to document shortcomings of NPTL is either a moron who hasn’t done her/hi
Copyright © 2004 bmind, LLC PREMIERE ISSUE 2004 WIDE OPEN MAGAZINE 53 OProfile is very useful for identifying processor perfor- mance bottlenecks. OProfile can be configured to take samples periodically to get time-based samples to indicate which sections of code are executed on the computer system. On many architectures OProfile provides access to the performance monitoring counters. The performa
©2012 - 2015 Red Hat, Inc., Ralph Bean. You can get the source from the github repo.
github git clone https://github.com/linux-audit/audit-userspace.git or browse audit code Mail List The mail list was migrated to https://lists.linux-audit.osci.io (as of Nov 6, 2023). Besides the archives at the new website, archives can also be found here: https://marc.info/?l=linux-audit&r=1&w=2 https://lore.kernel.org/linux-audit IRC We have #audit on libera.chat Blog Security + Data Science Sp
System Tuning Info for Linux Servers NOTE: Most of the info on this page is about 3 years, and one or two kernel versions out of date. This page is about optimizing and tuning Linux based systems for server oriented tasks. Most of the info presented here I've used myself, and have found it to be beneficial. I've tried to avoid the well tread ground (hdparm, turning off hostname lookups in apache,
How To Write Shared Libraries Ulrich Drepper drepper@gmail.com December 10, 2011 Abstract Today, shared libraries are ubiquitous. Developers use them for multiple reasons and create them just as they would create application code. This is a problem, though, since on many platforms some additional techniques must be applied even to generate decent code. Even more knowledge is needed to generate opt
There are still too many people out there who think (or even insist) that static linking has benefits. This has never been the case and never will be the case. Here are a few reasons why dynamic linking is superior: fixes (either security or only bug) have to be applied to only one place: the new DSO(s). If various applications are linked statically, all of them would have to be relinked. By the t
White Paper: Red Hat Crash Utility by David Anderson <anderson@redhat.com> Copyright © 2003, 2008 by Red Hat Software, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
What is dogtail? dogtail is a GUI test tool and automation framework written in Python. It uses Accessibility (a11y) technologies to communicate with desktop applications. dogtail scripts are written in Python and executed like any other Python program. dogtail is free software released under the GPL. Some example code is released to the Public Domain. Movies of dogtail in action can be found in t
Description of the POSIX signal model The POSIX signal model isn't simple. To get the kernel people to look at the issues I wrote this summary. Requirements of POSIX threads on the kernel Written to answer the often asked question about the requirements on the kernel to get a POSIX compliant thread implementation. The main requirement, that a M-on-N implementation is needed, turned fortunately out
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