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  • How to get an ARM CPU clock speed in Linux?

    - by MiKy
    I have an ARM-based embedded machine based on S3C2416 board. According to the specifications I have available there should be a 533 MHz ARM9 (ARM926EJ-S according to /proc/cpuinfo), however the software running on it "feels" slow, compared to the same software on my Android phone with a 528MHz ARM CPU. /proc/cpuinfo tells me that BogoMIPS is 266.24. I know that I should not trust BogoMIPS regarding performance ("Bogo" = bogus), however I would like to get a measurement on the actual CPU speed. On x86, I could use the rdtsc instruction to get the time stamp counter, wait a second (sleep(1)), read the counter again to get an approximation on the CPU speed, and according to my experience, this value was close enough to the real CPU speed. How can I find the actual CPU speed of given ARM processor? Update I found this simple Pi calculator, which I compiled both for my Android phone and the ARM board. The results are as follows: S3C2416 # cat /proc/cpuinfo Processor : ARM926EJ-S rev 5 (v5l) BogoMIPS : 266.24 Features : swp half fastmult edsp java ... #./pi_arm 10000 Calculation of PI using FFT and AGM, ver. LG1.1.2-MP1.5.2a.memsave ... 8.50 sec. (real time) Android # cat /proc/cpuinfo Processor : ARMv6-compatible processor rev 2 (v6l) BogoMIPS : 527.56 Features : swp half thumb fastmult edsp java # ./pi_android 10000 Calculation of PI using FFT and AGM, ver. LG1.1.2-MP1.5.2a.memsave ... 5.95 sec. (real time) So it seems that the ARM926EJ-S is slower than my Android phone, but not twice slower as I would expect by the BogoMIPS figures. I am still unsure about the clock speed of the ARM9 CPU.

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  • rhel/centos vs. ubuntu (possibly other debian-based systems) linux in handling duplicate ips in the same subnet

    - by johnshen64
    This has bothered me for quite a while but I never found out why or how to change the behavior. ip duplicates could be caused by typos or dhcp errors etc., but they do occur from time to time. in rpm-based systems such as centos, the old server with the duplicate ip wins, and the new server will get an error in bringing up the nic (ip address already used). this is somewhat harmless because we can just fix the system that is coming up. ubuntu only the other hand happily grabs the used ip for itself and leave the old server/device without a valid ip. this is the more dangerous behavior because it causes outages. what i want is to change the ubuntu behavior to that of the centos/rhel so would appreciate any help.

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  • Ideas for SVN/SQL/PHP/Linux Dev Enviroment Supporting Multiple Isolated Environments?

    - by jpganz18
    I am trying to create a "dev" for my users. In that environment they would access to their own account of PHPMyAdmin, SQL, Subversion and FTP which is not a big problem, but I would like to emulate like if each one would be in their own server. I mean so that they could change the PHP configuration (for example) and would be done only in its own environment. Any idea how to do this? Do I have to make something "special" at the installations of my server or something like that?

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  • What is the easiest/simplest way to change the HD on a Linux server?

    - by ArmlessJohn
    Hello. I have a machine running Ubuntu Server that has been presenting some HD-related problems. Instead of reinstalling and reconfiguring everything (and to save time) we'd like to copy everything from the current hard drive to a new one and start using it. We only have a single hard drive with a main partition and a swap partition. What tools or methods would you recommend for replacing a hard drive with minimum difficulty and chance of problems? Thank you.

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  • How do I enable SELinux when booting a ramdisk from a CD/DVD?

    - by JeffG
    I have a bootable DVD which boots the same Kernel as the Hard Drive (which uses SELinux). I have copied /etc/selinux and all kernel modules to my ramdisk, and have tried various combinations of selinux=1 and selinux 1 with enforcing 1 and enforcing 0. as Kernel boot parameters. All files contained in the checkpolicy, libselinux, policycoreutils, selinux-policy and selinux-policy-targeted rpms have also been copied into the ramdisk tree. After the system boots from the ramdisk, I check dmesg: % dmesg | grep -i selinux Kernel command line: initrd=idrd.img ramdisk_size=110476 selinux=1 SELinux: Initializing. SELinux: Starting in permissive mode selinux_register_security: Registering secondary module capability SElinux: Registering netfilter hooks But SELinux isn't running: % /usr/sbin/getenforce Disabled % /usr/sbin/setenforce 1 /usr/sbin/setenforce: SELinux is disabled Neither /var/log/messages nor /proc/kmsg hold clues.

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  • Smartcards for storing gpg/ssh keys (Linux) - what do I need?

    - by Ninefingers
    Hi All, I'm interested in storing my SSH keys and gpg keys on a smartcard for added security. However, I'm a bit uncertain on a few points, which are as follows: How many keys can I get on a card? I assume both SSH and GPG can store keys on the card. Is there a limit to key size? I see a lot of cards saying they support 2048-bit keys, what about larger sizes? Hardware: can anyone recommend a card/reader combination that works well? I've done a fair amount of research and it seems PC/SC readers can be a bit iffy - is this your experience? Have I missed anything I should be asking? Are there any other hurdles? I'm aware fsf europe give away cards with membership - I'm not sure I want to join, but... are these cards any good?

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  • Removing grub and getting a dual boot of Linux Mint and Win 8.1 working after failed attempt

    - by ThroatOfWinter57
    I gave the details of my problem at reddit: http://www.reddit.com/r/linuxquestions/comments/27qrun/more_specific_questions_about_failed_win_81mint/ tl;dr: I deleted the /, /home, and swap partitions I made for mint after realizing my installation couldn't be booted into and gave the space back to my windows partition. Running boot-repair on my mint live session messed stuff up. Now I can't even boot to my live session usb because grub is left over. Windows 8.1 does work though.

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  • Linux FHS: /srv vs /var ... where do I put stuff?

    - by wag2639
    My web development experience has started with Fedora and RHEL but I'm transitioning to Ubuntu. In Fedora/RHEL, the default seems to be using the /var folder while Ubuntu uses /srv. Is there any reason to use one over the other and where does the line split? (It confused me so much that until very recently, I thought /srv was /svr for server/service) My main concern deals with two types of folders default www and ftp directories specific application folders like: samba shares (possibly grouped under a smb folder) web applications (should these go in www folder, or do can I do a symlink to its own directory like "_/www/wordpress" - "/srv/wordpress") I'm looking for best practice, industry standards, and qualitative reasons for which approach is best (or at least why its favored).

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  • Proper way for changing MAC address in a linux VM?

    - by HappyDeveloper
    I tried to change the MAC address in a ubuntu VM (virtualbox), but after that it threw lots of errors during boot, and then I had no internet connection. Then I saw that the interface was renamed to eth1, so I edited /etc/network/interfaces to change eth0 to eth1, rebooted (didn't know how to restart the network), and boot was now faster and internet worked fine. But now after every time I log in, I get 1 or 2 error messages that say nothing, they only ask me if I want to report them. So I was wondering, is there was a proper way to change MAC address, to avoid these issues?

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  • How do I enable SELinux when booting from a CD/DVD?

    - by JeffG
    I have a bootable DVD which boots the same Kernel as the Hard Drive (which uses SELinux). I have copied /etc/selinux and all the kernel modules to my ramdisk, and have tried both selinux=1 and selinux 1 as Kernel boot parameters. After the system boots, I check dmesg: % dmesg | grep -i selinux Kernel command line: initrd=idrd.img ramdisk_size=110476 selinux=1 SELinux: Initializing. SELinux: Starting in permissive mode selinux_register_security: Registering secondary module capability SElinux: Registering netfilter hooks But SELinux isn't running: % /usr/sbin/getenforce Disabled % /usr/sbin/setenforce 1 /usr/sbin/setenforce: SELinux is disabled /var/log/messages does not hold any clues. /proc/kmsg also has nothing

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  • Updating PHP on Linux - "No Packages marked for Update"?

    - by Aristotle
    I'm very new to server-administration, but I was thinking the task of updating PHP to 5.2+ should be relatively simple. Online I found that the following was allegedly sufficient to do this: yum update php But when I run this, the following is output: [root@ip-XXX-XXX-XXX-XXX /]# php -v PHP 5.1.6 (cli) (built: Jan 13 2010 17:13:05) Copyright (c) 1997-2006 The PHP Group Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies [root@ip-XXX-XXX-XXX-XXX /]# yum update php Loaded plugins: fastestmirror Determining fastest mirrors * addons: p3plmirror02.prod.phx3.secureserver.net * base: p3plmirror02.prod.phx3.secureserver.net * extras: p3plmirror02.prod.phx3.secureserver.net * turbopanel-base: p3plmirror02.prod.phx3.secureserver.net * turbopanel-centos5: p3plmirror02.prod.phx3.secureserver.net * update: p3plmirror02.prod.phx3.secureserver.net addons | 951 B 00:00 addons/primary | 201 B 00:00 base | 2.1 kB 00:00 base/primary_db | 1.6 MB 00:00 extras | 1.1 kB 00:00 extras/primary | 107 kB 00:00 extras 325/325 turbopanel-base | 951 B 00:00 turbopanel-base/primary | 72 kB 00:00 turbopanel-base 494/494 turbopanel-centos5 | 951 B 00:00 turbopanel-centos5/primary | 2.1 kB 00:00 turbopanel-centos5 8/8 update | 1.9 kB 00:00 update/primary_db | 463 kB 00:00 Setting up Update Process No Packages marked for Update [root@ip-XXX-XXX-XXX-XXX /]# php -v PHP 5.1.6 (cli) (built: Jan 13 2010 17:13:05) Copyright (c) 1997-2006 The PHP Group Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technolog [root@ip-XXX-XXX-XXX-XXX /]# No Packages marked for Update [root@ip-XXX-XXX-XXX-XXX /]# php -v bash: No: command not found [root@ip-XXX-XXX-XXX-XXX /]# [root@ip-XXX-XXX-XXX-XXX /]# php -v bash: [root@ip-XXX-XXX-XXX-XXX: command not found [root@ip-XXX-XXX-XXX-XXX /]# PHP 5.1.6 (cli) (built: Jan 13 2010 17:13:05) bash: syntax error near unexpected token `(' [root@ip-XXX-XXX-XXX-XXX /]# Copyright (c) 1997-2006 The PHP Group bash: syntax error near unexpected token `c' [root@ip-XXX-XXX-XXX-XXX /]# Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies bash: syntax error near unexpected token `(' [root@ip-XXX-XXX-XXX-XXX /]# My PHP version is 5.1.6 before, and after running the command. Am I being too naive here with this update process? Is there a more verbose route that is necessary for me to take?

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  • Is there a maximum of open files per process in Linux?

    - by Malax
    My question is pretty simple and is actually stated in the title. One of my applications throws errors regarding "too many open files" at me, even tho the limit for the user the application runs with is higher than the default of 1024 (lsof -u $USER reports 3000 open fds). Because I cannot imagine why this happens, I guess there might be a maximum per process. Any idea is very appreciated! Edit: Some values that might help... root@Debian-60-squeeze-64-minimal ~ # ulimit -n 100000 root@Debian-60-squeeze-64-minimal ~ # tail -n 4 /etc/security/limits.conf myapp soft nofile 100000 myapp hard nofile 1000000 root soft nofile 100000 root hard nofile 1000000 root@Debian-60-squeeze-64-minimal ~ # lsof -n -u myapp | wc -l 2708

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  • Where are the TweetDeck settings-files located in (ubuntu-) linux?

    - by Philipp Andre
    Hi Everybody, i'm running Windows as well as Ubuntu and like to sync both tweetdeck installations via dropbox. Therefore i need to locate two files: td_26_[username].db preferences_[username].xml I found them on windows under the folder c:\Users[account]\AppData\Roaming\TweetDeckFast.[random string]\Local Store\ But i can't find them on my ubuntu installation. Does anyone know where these files are located? Best Regards Philipp

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  • Would it be smarter to setup a Linux development server at home, or to use a hosted server?

    - by markle976
    I am in the process of learning as much as I can about LAMP. I was wondering if I should set a web server on my home network, or use a service like Rackspace (cloud space)? I need to have root access, to be able to access it remotely via SSH/FTP/HTTP, and to be able to install things like subversion, etc. I currently have Comcast so I have plenty of bandwidth, but I am not sure if this would violate the TOS, and/or compromise the security of my home network. Pricing for these cloud hosts, seems reasonable ($11 per month plus about $0.10 per GB of bandwidth), but I am not sure if I will have to control I am looking for.

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  • How can I permanently fix my date synchronize problem in linux?

    - by gr33d
    Ubuntu 7.10 server i386 clock/date/time won't stay in sync. Are their log files I can view to tell when the clock changes? For a temporary fix, I created a file in /etc/cron.hourly: #!/bin/sh ntpdate time.nist.gov However, this still leaves a potential hour of unchecked time. Is there a cron.minutely? That would still leave a potential minute of unchecked time. I have read about CMOS battery problems, but what if this does not fix it? I'd like to be able to troubleshoot this as a completely software problem. My squid logs are showing dates back in 2005 when the clock changes, and my time-sensitive access controls are skewed and end up allowing users to surf prohibited websites during business hours.

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  • How do you add a certificate for WLAN in Linux, at the command-line?

    - by Neil
    I'm using Maemo on a Nokia n810 Internet tablet, and when given a list of installed certificates to choose from when connecting to a PEAP wireless network, it's always blank. I've already installed a couple of certificates through the gui on the device, and only the certificate authorities show up. I've confirmed that Maemo's connection software that handles certificates is buggy, in such a way that certificates are never added, or properly added certificates cannot be found. Is there a way to add WLAN certificates at the command-line, and connect to a wireless network at the command-line as well? I used to use iwconfig to connect, but I never used it with PEAP. Note: I have nothing in /etc/ssl/certs

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  • Is there a Linux-compatible R/C simulator that works with real radios?

    - by Norman Ramsey
    My Dad flies radio-controlled (R/C) aircraft. He used to run a simulator called "RealFlight" which allowed him to connect his actual radio to his computer and fly simulated craft. He learned enough to fly actual planes, but he wants to move up from "trainer" aircraft to higher-performance craft. After some crashes, he'd like to go back to the simulator for a while. The catch: he's given up Windows and is now running Ubuntu. Question: is there an R/C flight simulator that Runs on Ubuntu? Allows you to connect your radio and use it to control the simulator, preferably through a USB port?

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