July 2012 - luv-main - example.com

Re: Any USB 3G broadband usable under Linux?
by Tony Langdon 10 Jul '12

10 Jul '12

At 10:36 AM 7/10/2012, Lindsay Sprinter wrote: >Aother point, I believe some of these USB GSM modems on power up appears >as a cdrom, a linux progam does exist that will switch the rest of the >devices on, I have never used it though but it should not be to diffcult >to find. Newer kernels can do this switch automatically, IIRC. It's been a few years since I've configured a USB key, but this wasn't an issue on the kernel I was using at the time, the kernel was already able to handle the mode switch itself. I didn't need to run usb_modeswitch. I remember being a bit surprised that it "just worked". 73 de VK3JED / VK3IRL http://vkradio.com

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btrfs and corruption
by Russell Coker 09 Jul '12

09 Jul '12

One of my Xen DomUs is getting memory corruption. I'm not sure why. I've replaced all the RAM in the system and run memtest86+. The other DomUs work well. Everything was fine before I upgraded to Debian/Testing a week ago, so presumably it's a software bug. The most common symptoms are application SEGVs and GLIBC reporting heap corruption for no apparent reason. Anyway I moved that system to btrfs and since then I've got a couple of corrupted files. Both files were from Debian packages so the --reinstall option to apt-get fixed that. It seems that when a file on disk has a checksum mismatch for all copies you get ESTALE as well as messages on the system console like the following: [ 6747.164889] btrfs: corrupt leaf, bad key order: block=1116618752,root=1, slot=0 BTRFS is doing some good already! -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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strange mysqld CPU use
by Russell Coker 09 Jul '12

09 Jul '12

# strace -p 20033 Process 20033 attached - interrupt to quit restart_syscall(<... resuming interrupted call ...>^C <unfinished ...> Process 20033 detached The below is from a system running a recent update of Debian/Testing. Running strace on process 20033 shows that it's stuck in a system call (see the above strace output). So it appears that one of the child threads of 20033 is using the CPU time. How do I determine which one it is? Does anyone have any general suggestions for debugging the case where mysqld is using a lot of CPU time while not doing anything? The mysql command "show processlist;" shows that there are currently NO connections to mysqld at all. top - 17:23:54 up 22:44, 2 users, load average: 1.22, 2.00, 2.59 Tasks: 191 total, 1 running, 190 sleeping, 0 stopped, 0 zombie %Cpu(s): 21.6 us, 2.6 sy, 0.0 ni, 75.0 id, 0.8 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 2034264 total, 1621676 used, 412588 free, 51228 buffers KiB Swap: 1949692 total, 66244 used, 1883448 free, 879412 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20033 mysql 20 0 344m 37m 1480 S 130.9 1.9 33:31.93 mysqld 27420 root 20 0 23300 1548 1084 R 5.9 0.1 0:00.02 top -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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ZFS and kernel 3.2.0
by Russell Coker 09 Jul '12

09 Jul '12

I have a Debian/Squeeze system that's running ZFS quite nicely. Now I've just tried to install ZFS via the http://zfsonlinux.org/ method on a Debian/Testing system. I'm deploying a new server in the next week or so and it'll ramp up to full production over the course of the month after that, so it seems best to start with Wheezy even a little before the full release to avoid a painful upgrade later. The code doesn't currently build with kernel 3.2.0. Has anyone got it to work? Also has anyone got root on ZFS to work with Debian? ZFS wants to partition the disks itself so it can use 4K sectors and properly align things. I don't want to mess with that and the server in question will have an internal USB port that's ideal for booting such configurations. So I want to get a USB device with GRUB and an initramfs that starts ZFS for the root filesystem. I have already had a hack at it on Squeeze, but I wasn't able to get it going in the time I had available. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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USB TV card and Linux
by Andrew Greig 08 Jul '12

08 Jul '12

Hi all. I have searched for info on setting up a USB TV card under Linux and have been overwhelmed with the amount of info. Harvey Norman have a Kaiser Baas USB TV stick on sale at present for $48 and a Kaiser Baas dual device for $87. I thought I would take my notebook (Suse 64 12.1) down there and try the device in-store. What programs should I install before I get there, please? What is the advantage of the dual tuner stick? Thanks Andrew Greig

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DSCP ECN
by Tim Connors 06 Jul '12

06 Jul '12

We've got networks people claiming that we're killing their network link with packets claiming to be so high priority that they're swamping VOIP. Previous correspondence with them imply it's ssh and ftp connections that are responsible. Specifically, they're saying that we're setting DSCP to 0x2, which is not defined. Anyone know how to read the RFCs to say whether we're doing something wrong (we're not doing anything to change ftp, ssh or iptables rules from default settings)? Anyone seen this before? Indeed, http://bogpeople.com/networking/dscp.shtml has no setting for dscp=0x2. I doubt anything, particularly the alledged ssh, is using the old RFC791/RFC1349 interpretations of bits 3 => 1 = High Throughput; 0 = Normal Throughput This: http://www.quora.com/How-can-I-identify-interactive-SSH-but-not-SCP-packets shows that ssh/scp use QoS that don't map to any defined DSCP numbers. But that shouldn't be a problem, no? The routers shouldn't kill the network just because a client told them to watch out for the flying elephants. -- Tim Connors

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Audioproblem after upgrading to kernel 3.4.4
by Lindsay Sprinter 05 Jul '12

05 Jul '12

I recently upgraded one of my systems from kernel 2.6.39.4 to 3.4.4. both are custom complied kernels. With the new kernel some videos have problems playing with some players. Xine and mplayer don not work but VLC does. The major error message from both xine and mplayer is "Unable to open audio: No available audio device" Mplayer gives more information, the problem is any video that uses a AAC (MPEG2/4 Advanced Audio Coding) sound track fails (formats so far that do not work is flash video and MP4), other soundtracks appear to be OK, The actual failure appears to be caused by the sound driver not exepting the hw setup arguments from Xine and mplayer. It sort of appears in the latter kernel something has changed in the sound driver. A search on the net produced little information, only a single report stating simliar symptoms , the report being only a week old. Anybody know anything on this. BTW the system uses Debian 6.0.x

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Minecraft on Debian/Testing
by Russell Coker 04 Jul '12

04 Jul '12

More than a year ago I installed Minecraft on a Debian workstation. The user was quite happy and had no interest in upgrading it or networking it. Now they want it upgraded to the latest version to support mods. I try to connect to the Minecraft server and I get the below error. Any tips on what I should do? As an aside I've upgraded the system to Debian/Testing, I think it was running Squeeze when I first connected to the Minecraft server (which you have to do to get game data files etc). java.io.FileNotFoundException: http://session.minecraft.net/game/getversion.jsp? at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1401) at net.minecraft.Util.excutePost(Util.java:76) at net.minecraft.LauncherFrame.login(LauncherFrame.java:80) at net.minecraft.LoginForm$3.actionPerformed(LoginForm.java:61) at java.awt.Button.processActionEvent(Button.java:409) at java.awt.Button.processEvent(Button.java:377) at java.awt.Component.dispatchEventImpl(Component.java:4629) at java.awt.Component.dispatchEvent(Component.java:4455) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649) at java.awt.EventQueue.access$000(EventQueue.java:96) at java.awt.EventQueue$1.run(EventQueue.java:608) at java.awt.EventQueue$1.run(EventQueue.java:606) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116) at java.awt.EventQueue$2.run(EventQueue.java:622) at java.awt.EventQueue$2.run(EventQueue.java:620) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105) at java.awt.EventQueue.dispatchEvent(EventQueue.java:619) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177) at java.awt.EventDispatchThread.run(EventDispatchThread.java:138) -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Apt problem
by Bob 04 Jul '12

04 Jul '12

Hello all, Trying to update a system running Kubuntu Precise. Running sudo apt-get update results in the following at the end of the process: Hit http://archive.canonical.com precise/partner i386 Packages Ign http://archive.canonical.com precise/partner TranslationIndex Hit http://security.ubuntu.com precise-security/main amd64 Packages Hit http://security.ubuntu.com precise-security/multiverse amd64 Packages Hit http://security.ubuntu.com precise-security/universe i386 Packages Hit http://security.ubuntu.com precise-security/main i386 Packages Hit http://security.ubuntu.com precise-security/multiverse i386 Packages Hit http://security.ubuntu.com precise-security/main TranslationIndex Hit http://security.ubuntu.com precise-security/multiverse TranslationIndex Hit http://security.ubuntu.com precise-security/universe TranslationIndex Hit http://security.ubuntu.com precise-security/main Translation-en Ign http://dl.google.com stable/main Translation-en_AU Hit http://security.ubuntu.com precise-security/multiverse Translation-en Ign http://dl.google.com stable/main Translation-en Hit http://security.ubuntu.com precise-security/universe Translation-en Ign http://extras.ubuntu.com precise/main Translation-en_AU Ign http://extras.ubuntu.com precise/main Translation-en Ign http://archive.canonical.com precise/partner Translation-en_AU Ign http://archive.canonical.com precise/partner Translation-en Fetched 4,919 B in 6s (706 B/s) Reading package lists... Done W: Duplicate sources.list entry http://au.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages (/var/lib/apt/lists/au.archive.ubuntu.com_ubuntu_dists_precise_universe_binary-amd64_Packages) W: Duplicate sources.list entry http://au.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages (/var/lib/apt/lists/au.archive.ubuntu.com_ubuntu_dists_precise_universe_binary-i386_Packages) W: Duplicate sources.list entry http://au.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages (/var/lib/apt/lists/au.archive.ubuntu.com_ubuntu_dists_precise-updates_main_binary-amd64_Packages) W: Duplicate sources.list entry http://au.archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages (/var/lib/apt/lists/au.archive.ubuntu.com_ubuntu_dists_precise-updates_main_binary-i386_Packages) W: You may want to run apt-get update to correct these problems Unfortunately running sudo apt-get update or sudo apt-get update --fix-missing doesn't solve the problem. Could anyone suggest where I should go from here Thanks Bob

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re : Linux powered drone @ 5pm folllowed by pre-meeting dinner @ Korean
by Brent Wallis 04 Jul '12

04 Jul '12

On Wed, Jul 4, 2012 at 3:57 PM, Russell Coker <russell(a)coker.com.au> wrote: > On Wed, 4 Jul 2012, Brent Wallis <brent.wallis(a)gmail.com> wrote: >> These machines will soon be deployed by police, fire brigades, >> ambulances (why I have no idea) ....navy, army and heavens knows who >> else... > > I wonder how often an ambulance team would have difficulty in finding the > sick/injured person. Being able to look over high fences etc might be helpful > in that regard. ...that makes sense. Didnt think of it that way. Actually, another idea that comes to mind based on your idea would be to fly over a large crowd to establish the direction of a collapsed person....

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