Ubuntu :: When System Is "fresh" Booted There Are No Noticeable "Extra Timer Interrupts"?
Feb 25, 2010
See the following output from powertop:
Uptime 5 minutes
Wakeups-from-idle per second : 86,8interval: 15,0s
no ACPI power usage estimate available
Top causes for wakeups:
37,8% (129,7) <interrupt> : uhci_hcd:usb2, uhci_hcd:usb5, rr26xx
23,6% ( 81,0) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)[code]....
As you can see, when system is "fresh" booted there are no noticeable "Extra timer interrupts". As time goes, this number seems to increase. I have tried to find out what causes this behaviour without any luck. I am not even sure if this is any practical problem, as performance seems to be more or less unaffected, but any explanation to this would be nice. Anyone else ever notice this?I am running Ubuntu 9.10 Server edition on a Dell Poweredge SC1420, 64-bit version. The server is used for web and file sharing mostly, with little load. (15 min avg. about 0,10).
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Jul 23, 2010
I'm trying to understand how interrupts work. Is there a way to generate timer interrupts in C. Also can we enter into the protected mode of the CPU. Does OS (specifically, linux) place any restrictions on user programs entering protected mode. If it does not, do we just have an assembly language program which changed the mode, followed by the C code... I'm just trying to understand how things work at the lowest level. So I'm trying to write few snippets to test my understanding.
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Oct 27, 2010
I am trying to figure out how to mask local timer interrupts on a specific core of a multicore system from within user space. The interrupts are causing latency spikes of 3-10u that we would like to remove. We are only running 1 thread on the core h everything shielded except for these timer interrupts. This thread makes no system calls and thus is never getting context switched out. I am not looking to turn them off entirely but rather turn them off, run my code, turn them on in a continuous loop. The thread runs in user space which we are hoping to maintain. We also have no desire to modify the kernel if possible. I've read about using spinlock_irqsave() but it appears (not positive) that it must be used within kernel space.
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Dec 7, 2010
I have a question regarding the /proc/interrupts file. Let's say for example I had a server with 2xQuad-Core processors (so we have CPU0 to CPU7 ), and with 5 network interfaces. SMP affinity to all 5 interfaces was set to "ff", so all interfaces have done interrupts on all the processors. he network interfaces interrupts counters should look like this:
24: 32650776 32670506 50315017 32677739 32672119 32677935 32656299 32667496 IO-APIC-fasteoi eth2
27: 35233448 35285546 35317201 52657622 35315835 35339998 35221092 35246597 IO-APIC-fasteoi eth3
55: 37573056 35870363 35874607 35858010 37728061 35880275 35882340 35882127 PCI-MSI-edge eth1
56: 35861392 35863516 35865123 35865342 35864604 40515822 35861250 35863585 PCI-MSI-edge eth0
58: 30173318 30109146 30002990 30016870 30084937 30034759 46517278 30139103 PCI-MSI-edge eth4
Now let's say I've set the affinity to each of the network interfaces, so that it balances one per processor, so we have 5 processors working only for the network interfaces each processor with it's own eth. Now let's assume that the network interfaces generate very few interrupts, and that they show up every 5-6 seconds, so watching cat /proc/interrupts doesn't exactly underline the modifications unless you look with a ruler. Is there a way to reset the counters on /proc/interrupts so that they all start at 0, without rebooting the system?
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Oct 28, 2010
Booted up system and it stated please insert system disk press any key.So it sounds like my startup got corrupted? I running centos 4.5 on it (old yes) Is there a repair I can perform by a disk? Would it matter if I chose i386 or x86? I cant remeber which version was installed on it.
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Feb 27, 2011
My system decided to crash on me, hard. It was humming along happily for about 2 months and now doesn't boot. If I boot from hard-disk, I get grub. Launching the first kernel choice hangs. I thought maybe the install was corrupt, so I booted from usb install disk. The usb hdd didn't boot; something about an error trying to access /dev/sda . Unplugging the internal disk and plugging in the usb install disk does result in the system booting. Plugging in the internal disk in a running system usb-booted system does not result in the system detecting the disk.
How do I know if the disk is physically broken? This seems unlikely since it does manage to launch grub consistently. Or is this still possible? How can I try to mount whatever is left? The usb install disk doesn't even list the /dev/sd*. Any pointers on how to reformat the drive if it's not being mounted?
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Dec 1, 2008
I recently started experimenting with Ubuntu 8.10 and I've spent the last week mostly getting the HDD partitions and desktop to my liking so I have not installed many actual programs yet. As of this last Saturday ( 11-29-2008 ) my Keyboard (PS/2 connection) worked fine whether booted into Ubuntu or XP and worked in grub as well. I discovered on Sunday the 30th that when booted into XP my keyboard no longer worked(but my USB mouse works). The keyboard still works fine in Grub and in Ubuntu but no amount of keypressing works when booted into XP. My device manager indicates the driver has been corrupted or something (Code 39 error) and indicates the driver files are i8042prt.sys and kbdclass.sys.
Here's a list of the things I've tried so far:Tried swapping in a USB keyboard; I've tried updating the drivers in Device Manager; Tried uninstalling/reinstalling the drivers in Device Manager; I tried the "uninstall driver, shutdown, unplug keyboard, reboot, shutdown, plug keyboard back in and reboot" routine; deleting those two files and letting them be rebuilt at boot; using the recovery console to copy them from the XP install CD to the System32/Drivers folder and as a last resort I tried a repair install only to find when asked to enter the CoA code the keyboard still did not work.
I obviously borked something on the Ubuntu side that's causing a conflicting with those drivers on the XP side but I'm at a loss as to what that might be. The only thing I can remember installing since the last time the keyboard worked was maybe Wine, but for sure I did a test install of my Baldur's Gate+ToSC disc and I attempted to install Daemon Tools Lite too. I've since uninstalled those two programs and even Wine itself without results. The only other thing I can think of is that I've been messing around with the /fstab file a lot trying to get all my drives/partitions to mount up at boot like I want but I don't know how that would impact the keyboard drivers.
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Dec 9, 2010
This is what I have given as bootargs... Kernel is working fine with filesystem if booted from pendrive /dev/sda1..But as I want to make that work from NAND, where already uboot and uImage are located...I used nand_erase and ubiformat to write ubi image on NAND.But after applying this, on uboot
setenv console 'console=ttyS0,115200 mtdparts=nand_mtd:0x100000@0x000000(uboot),0x400000@0x100000(uImage),0x1fb00000@0x500000(rootfs)'
[code]....
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Aug 11, 2010
trying to add things - drivers,etc. to make it look/act as it should found out later that it's due to quirkiness of running two systems in tandem (occas)...anyways i'm going to boot a fresh copy of xP pro again tomorrow..any wisdom to be lent b4 i do...uBuntu 10.4 rocks,..so I will be a permanent user/supp of this oS. Thx for having a forum such as this as I am green as can be to this stuff
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Sep 1, 2011
Has anyone else who uses Miro noticed a very noticeable sluggishness to it lately? It's been a bit since I've used it, but opened it up today, and it's just performing at a crawl, not to mention sucking up a goodly amount of CPU cycles (process "miro.real"). I've tried the Repo version 3.5.x as well as the PPA version 4.0.3, both are just as slow and as choppy as it can be in 11.04. Any thoughts, or anyone just want to share my misery? It loves company...
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May 8, 2011
Does anyone here has any experience with the proprietary compilers? OpenWatcom, Intel and Pathscale? Does the performance gain is noticeable regarding the gcc...?In number crunching applications, i may say that ifort/ icc/ mkl yeld faster binaries than gcc.has anyone here already tinkered with OpenWatcom/PathScale...?
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Aug 20, 2010
I am in the process of creating a kickstart configuration file for some RedHat 5.5 and Centos 5.5 servers (Production and test respectively).I have googled about a bit but I cannot find a good list of the bare minimum packages required for a command-line system.If anyone knows how I can trim this list down anymore it would be much appreciated. The aim of this kickstart.cfg is to get the system booted to a bare minimum required to install Chef (Server management software). Chef will then setup Apache, Ruby on rails environment etc.
All this server will need to do is, from a static IP, Host a Ruby on rails app, send emails, send data to a server on the web, accept ssh and occasionally and connect to a SMB/CIFS share This list was taken from the anaconda-ks.cfg file after a RedHat install of what I thought was a pretty minimal system onto a VM but I noticed that cups, the avahi daemonsand gam_server are installed and running which I do not believe are needed for a pure web server.I know that these types of questions are hard to answer without a complete knowledge of the operating environment and what "minimum" is in this case ("@core only? but I wanted yum damnit!")
@admin-tools
@base
@core
[code]....
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Jan 2, 2010
I was multitab browsing (around 15 tabs) in latest firefox for karmic koala (9.10) and at the same time downloading (probably already auto-installing) in synaptic-package-manager the package: textlive-fonts-extra (and other necessary packages; this was around 90 mb download and 250 mb installation)suddenly the pointer doesn't move anymore, (Alt+tab , and other combinations also didn't work anymore)
and I hold the power button untill the computer is turned off,when I reboot I get this message"invalid system disk, replace it and press any key to continue"now I'm using a livedisc to boot the computer (jaunty 9.04)To rebuild the system i think to manually install the packages that probably were interupted while installing and made it not work anymoreThe packages to be installed when text-live-fonts is marked for install (in synaptic opened from the livedisc) are:
dvipdfmx
lmodern
text-common
texlive-base
texlive-base-bin
[code]...
This may be different with 9.10 configuration (can anybody look to see which are necessary with 9.10) I think the computer wasn't responding anymore because I used too many tabs at ones. I had this same problem a few times before in the past weeks but then I wasn't installing something and the computer did restart and firefox restored all the tabs. I cannot enter /home/ from the livedisc (no permission) and it's necessary , I am in the middle of exams and i need to print the paper that is on the disc by monday Is there a way to enter it via command console?
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Feb 11, 2010
I'm running Fedora Core 12 and XFCE on a Pentium 4 with 2 Gb of RAM. It is useable, but not fast. The video is some crumy on-board stuff in an old IBM Netvista pc. I wonder if adding a nicer nVidia based accelerator will make a noticeable different in performance.
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Oct 17, 2010
Install One :
Installed Debian Squeeze onto my laptop using the netinst cd. During installation, I did not have access to the internet and installed "Standard System" during tasksel.
Install Two :
Installed Debian Sqeeze onto my desktop using the same netinst cd. However, this time I had connected the desktop to my router during installation. Similary installed "Standard System".
Both system later installed with KDE and working fine. Noticed that immediate after installation of the "Standard System", my desktop had more files installed eg. the exim package. Why the extra packages (eg exim) are installed? Are they actually required?
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Jul 18, 2010
there are 2 related to 11.3: openSUSE_11.3/ and openSUSE_11.3_KDE_Distro_Factory/ Index of /repositories/KDE:/Extra they are not listed as official kde4 repos here KDE repositories - openSUSE, but they are in the same directory structure on the build service so it would assume they are official (what ever official means) They have rpm's I didn't see in community and playground (at least for 11.3) such as audex and clementine I would guess that they are for the stable and factory versions of KDE4 but then shouldn't there be a 3rd for unstable if this was the case? Or do they refer to the distro, 11.3 stable and 11.3 factory
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Mar 3, 2010
Started slackpkg upgrade-up and went to bed. Woke up to find the power had gone out during the night. The computer booted up, but displayed a message that said something to the effect of, "Error occurred during root file system check. You will be given the option of doing maintenance......"I can get to a command prompt, but regardless of what I do a message pops saying it can't find libblkid.so.1
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Jan 13, 2010
I have had a new install of Karmic from CD and have done all updates and added a few applications like VLC and a few others. I have several different media players, Totem, VLC, Xine, and gxine. I started out thinking Totem might be enough, but added VLC as it can handle just about anything, and then the other just to see of any thing happened.
I have installed all restricted and unrestricted packages from the Medibuntu depositories I can find. Still my laptop will not read any kind of DVD. I am region 2, but have tried both bought region 1 and region 2 DVDs. I had this problem last time I installed Ubuntu, but after installations of a few applications and messing about it suddenly worked. I really didn't know why or what suddenly was working.
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Dec 17, 2010
I was installing freebds for one of my friends and during the entire install the top never crossed 1.0. When I install linux top always shows a cpu load of more than 1.0.Also on the bsd when copying a huge file (4gb) it takes a long time but then the load never goes beyond 1.0. Linux will do it much faster but then there is a difference in the cpu load time.What I want to know is is there anyway I can interupt the processor so that the load does not go beyond 1.0.
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May 1, 2011
I'm getting random system hangs and display issues when using my computer with my nVidia graphics card. On a lark, i checked /proc/interrupts and noticed that the nvidia device is sharing an interrupt with one of my USB boards, as well as my integrated sound card. i managed to move my sound card by editing my alsa-base and adding:
Code: options snd-hda-intel enable_msi=1 This helps mostly, but i'm still getting intermittant issues. is there any way to shift the interrupt of my gfx card (or usb controller) to avoid this potential conflict? i know the devices should be able to co-exist, but i've seen several people having issues when an nVidia card shares interrupts.
[Code]...
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Oct 14, 2010
I'm trying to install 10.10 64bit on a DFI X48 mainboard with 8Gb RAM, I've tried installing from the Desktop CD, Alternate CD and USB stick, but all attempts fail with
uncompression error
-- System halted
I've run memtest86 and the RAM passes OK, I've even tried running the install with just 4Gb RAM but without any luck. I've even tried three different CD/DVD drives.10.04 64bit runs from the Live CD without any problems, but 10.10 isn't playing ball...
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May 6, 2011
I just installed the newest version of Xubuntu using the LiveCD, I chose to install it alongside my current installation of Windows 7, everything went well it seemed, but now when I choose Windows 7 under the GRUB menu it just restarts my system and then takes me back to the grub menu, Xubuntu works fine though and boots fine, I tried sudo update-grub, didn't fix it.Heres the boot info from a script I found, but being rather poor when it comes to diagnosing Linux, I figured it'd be best to post this and see
Code:
Boot Info Script 0.55 dated February 15th, 2010
============================= Boot Info Summary: ==============================
[code]....
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Apr 22, 2011
I tried to update one of my home machines with a fresh install. This is far from new to me so I did not expect any problem. But I was proven wrong. First: did install the system as usual. First anomaly: system blocked during the install process but did restart it flawlessly one I tried to eject the DVD from the player. It needed actually that intervention to retake working. It then went to install and froze during the first system start. I rebooted with failsafe settings, it then correctly configured. I reached a beautiful desktop. I performed the updates from the update repository and I joined the nvidia proprietary driver repository (which updated to the G02 driver).
I then rebooted the machine and now I am in trouble. In normal mode the system (dual boot Opensuse, XP) does not boot at all and freezes immediately after hitting enter as before. In safe mode it goes further but does not reach X anymore. It blocks with the following line statement: "system console stolen at line 266". I then tried "startx". But the system goes into a scrolling loop that does not allow me to read the output. how to get at least the error message of the loop? I read some line passing by that the system might have an X11 authorization problem.
Athlon Phenom X4 905e
Nividea G7600 graphic card
Former system installed and running flawlessly: 11.1
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Jun 27, 2010
I hope this is the right place to post to because I haven't found any other related forums.I'm working on an AMD opteron running Linux 2.6.28.6 I want to preload a hardware performance counter (register) with a value to have it overflow after a number of a specific event counts. As I understand, when the counter in the register overflows, an interrupt will be generated and handled by the appropriate interrupt handler. How can my user-level application get notified whenever the interrupt occurs? I want to obtain information on the instruction that caused the overflow. Is this possible? I think this is different than responding to signals with sigaction().
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Sep 6, 2010
So I've been researching this on my new NAS. I just tried to register the IP on the new system to have an issue pop up that says:
"msk0: watchdog timeout (missed Tx interrupts) -- recovering"
The error repeats then ends with no set IP. I tried the loader.conf fix but I cannot write to the system its installed on (embedded on a harddrive + data + swap) but it gives me a issue with write privileges which I thought would have been fixed by chmod +w /cf.
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Sep 16, 2010
Is there any Kernel parameter available for interrupts handling, In the case of busy server how we can tune the kernel to handle interrupts effectively.
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Feb 14, 2009
I am working on development of an TOS that runs in Protected Mode. I am required to switch it from text mode to graphics mode. Everywhere I google I get only one solution set AX to 0013h and call INT 10 and easily the VGA Graphics Mode is set.
I am working in protected mode and hence cannot use INT 10. Can someone please guide me? I came across a post where it was said that this can be done by setting the VGA registers, but I could not understand much from the link provided in the post on how to implement it.
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Jun 22, 2009
What does this means:
[6867450.202500] hpet1: lost 1 rtc interrupts
[6867450.548506] hpet1: lost 2 rtc interrupts
May 24 20:20:01 vms2 kernel: [6886829.451310] console-kit-dae[19655]: segfault at 198 ip 00007f4c31b7fe09 sp 000000004036c090 error 4 in libglib-2.0.so.0.1800.2[7f4c31b53000+c3000]"
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Mar 1, 2010
After a fresh install of Debian I came across an error Im hoping you guys can help me with. Ive searched for the error and it appears there are multiple reasons that could be causing it. To compound the problem, Im at work so I dont have the specific error messages....so I just installed Lenny (standard install, no desktop) using a USB installer and everything went very smooth. On first boot, the system paused while waiting for the root file system. After a minute or two it just errored out complaining it could not find the root file system and put me at a (vmlinuz) prompt?My guess is that I need to go into my bios and change my boot priority.. but again, thats just a guess.
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Mar 4, 2010
after fresh f12 install says reboot & i do... no boot menu, boots xp. there's probably a solution, but i don't know it. someone know how to get around this?
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