General :: What Are Implications Of Using 'noapic' Kernel Parameter?
Aug 4, 2010
I recently enabled noapic on my laptop because it was experiencing strange input freezes on several distros that I tried.Ok, so it does not use the ioapics. My question is, what does this mean for the system? If it used apics before, what happens now? I am a freshly graduated computer science major, and I have worked with basics pics on projects before, but I am curious how this effects the running system.
According to security manual i need to incorporate following changes into kernal parameter but i m not sure when and how these changes will be implemented.
Code:
net.ipv4.conf.all.accept_source_route must be set to "0" net.ipv4.ip_forward must be set to "0" (zero) icmp_echo_ignore_broadcasts must be set to "1" net.ipv4.tcp_syncookies must be set to "1"
I installed ubuntu on a second hard drive.Nowhere did the fracken ubuntu installer ask my permission to over-write my mbr but that's exactly what it did.I'm booted off the rescue CD trying to restore the mbr to how centos left it (I'll add ubuntu to grub manually) but I can't boot into rescue.linux rescue results in a kernel panic suggesting I need the noapic argument. Makes sense, I needed that to install and need that in grub.linux rescue noapic boots into the installer, not rescue.How do I boot into rescue mode with the noapic kernel argument?
I've done the usual edit of /etc/sysctl.conf to include the parameter, but it just tosses errors. I haven't had to tune a kernel in a very long time, what's different about it nowadays (or have I simply forgotten how)?
edit: Added "kernel.semmni = 2048" to the tail of /etc/sysctl.conf and then ran "sysctl -p". End result is an unknown key error (apparently kernel.semmni isn't the valid name anymore?).
I am trying to do a fsck on my ext3 partition, but so far failed to let the system come up in single user mode and having the partition mounted read only. It says in the kernel parameter that it is read only (RO) but still mounts it RW. A remount with mount -o remount,ro does not work, since / is always busy. what to do to get a fsck done? I don't want to boot into a rescue system, this should be possible on a running system (like Windows does it, when rebooting)
I have an issue that is fixed by changing the lpfc driver to run using MSI interrupts. This is done by adding "options lpfc lpfc_use_msi=2" /etc/modprobe.conf.local file.
Is there a way to make this change using kernel boot parameters?
I got the following modprobe scripts modprobe -k -q streams what does the -k parameter mean?. is it exist in older modprobe? I don't see -k parameter in recent modprobe.
Let's say I'm using one of those PCs that uses a SSD flash drive in place of a more regular HDD.
Say I burn my favorite .iso distro and install it on this PC. I install my favorite applications and seek out and install any missing drivers and generally tweak the system like you do. When I am finally happy with it, I make an image of this installation to an external USB drive.
Now, say 9 months later some of those SSD blocks have gone bad because they were erased too often. They're no longer usable. Also, because I'm a sloppy person who can't be bothered to delete redundant stuff and run make-cleans and so forth, the disk is getting pretty cluttered and takes longer and longer to do stuff.
I decide the obvious solution is to remove and save any data I need to keep, then just over-write the disk with the image I made 9 months earlier.
The question is: will the firmware be smart enough to re-map my incoming image to avoid these bad blocks on the SSD? Or am I going to wind up with some parts of the image being located on bad areas of the SSD?
I have not dug into Ubuntu for almost a year now (Since Jaunty, really). I am trying to come to grips with Grub2, but have just now encountered it in Lucid. I am having a terrible time with the graphics chipset, and it may well be that Ubuntu cannot be used on this computer (an older laptop with the dreaded Intel 82845G graphics chip). There are a number of older bug reports that it is unsupported, but some success in more recent versions.
Anyway, one suggestion has been to add i915.nomodset=1 to the kernel boot line. Now, this was a cinch in Legacy Grub, but I have been reading Grub2 wikis and tutorials for two days now, and I know about the config files, but I cannot find anything which tells me specifically how to add a parameter to the kernel boot line.
I have a "Chicony 1.3M UVC Webcam (Asus G1S notebooks)" webcam, which is supported by Linux UVC [1]. However I'm unable to find the kernel parameter that I should select to compile my kernel to support this device.
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.
It's documented in the howto's that you need to have the nomodeset kernel parameter specified if you want to run the proprietary Nvidia driver. But I read in certain posts that this is only required for "older" graphics cards.Can someone shed some light on this? Is the parameter ALWAYS required when running the nvidia driver, or only for certain graphic cards?
Hey,everyone! I've got Ubuntu 10.10 , when loading I see the following message: "atk: Resources not safely usable due to acpi_enforce_resources kernel parameter" What does it mean and do I need to fix it?
I'm trying to install Oracle DB on OpenSuse (is it smart, because it's not certified for that OS?)..and I've set oracle parameters using oracle script, but when I'm runnign through oracle installation, kernel parameters check reports that parametersa are 'n/a', like oracle OS account cannot access those parameters..
After setting the "nomodeset" kernel parameter, to install the nVidia proprietary driver in OpenSuSE 11.3 (I need to do CUDA development), my Sansa Clip+ is no longer recognized. When I turn the "nomodeset" option off, I can see it with $(fdisk -l).
Would like to ask for some advise regarding GRUB. I have been using Windows for a long time and recently have finally decided to switch to Linux. A good friend recommended Ubuntu and I have installed it on an 8GB USB thumbdrive for test drive. Nowadays, I mainly boot from this thumbdrive for my personal computing use. [I am a supporter of the "Immersion Learning" school. The only way for me to really learn is to force myself to use the system ] as I frequently updates my Ubuntu 9.10 via the Update Manager, I found my GRUB screen now have multiple entries like below:
[Code]....
I would like to remove the last 4 lines but:
1. I'm not sure how to do it?
2. And do i just delete the entries or do i also have to delete some system files? {this is important as i am running this on a USB thumbdrive and would like to remove any files that are no longer necessarily and keep the installation as lean as possible}.
Hybernate does not work on my laptop. I receive the following error in the log: Running hook /usr/lib/pm-utils/sleep.d/30s2disk-check hibernate hibernate:
INFO: checking for suspend-to-disk prerequisites... ERROR: no resume parameter on kernel commandline, can not suspend
To boot into Ubuntu 8.10, I have to boot with noapic. Is there an easy way to always boot with this command. And don't worry, I have fair bit of computer know how, just moving from windows to ubuntu.
My computer needs the boot option "noapic". Unfortunately the Ethernet doesn't work. It does work when I use the boot options "noapic acpi=off" but the printer that is connected via a parallel port does not work. Also I have to push the power button the system is shutting down with this option.
I need a simplistic explanation of positional parameter. Have read all I can get my hands in, I kinds of understand to an extent, but I want to get. Full grasp of it. Oils like to know what is does, its functions, when to use it, and all its functions. Thanks in anticipation. Distro Red hat.
It looks like the -t parameter is no longer available when using the shutdown command. What I'm trying to figure out is how to send all the daemons the kill signal, but wait a certain amount of time before actually halting or rebooting. I can't be the only one wanting to do this, but for all the searching I'm doing I can't find an answer.The following only warns, then waits 1 minute before sending the kill signal and immediately halting, correct? Or am I getting this completely wrong?
as $1 $2 represent first and second argument..for example- in a shell script..../commfile file1 file2 file3 now in commfile i want to receive files by running a loop...like
for (i=1;i<$#;i++) do cat ${i} //help me here echo do u want to proceed
To make Ubuntu work on my computer I need to select the noapic option NOW How do I make certain that the noapic option is selected always when ubuntu starts after ubuntu has been installed?I would like to install Ubuntu 10.10 on my computer togheter with windows 7
I am familiar with bash, but my works require csh. in my .cshrc, I created this alias:alias cd 'cd !:1; ls -l' It works very well except for one case: when I cd without any parameter:
cd In which case, I get the "Bad ! arg selector" error. How do I eliminate this error?
I want to create a variable that when passed as a parameter to another bash script will keep its string quotes (so it stays as one parameter). What ways can I achieve this cleanly?
I have a backup schedule running a full backup everyday. I'm using webmin to manage these backup now. The problem is when the dump command sends a prompt asking if we want to rewrite the tape, Webmin does not display this prompt and we end up having to terminate the backup -> erase the tape(which takes a long time) and then run the backup again.I was wondering if there is a technique that could be used to pass "Yes" as a parameter to the dump command, much like in windows? or if there is a more efficient way of getting this done.
I am following an instruction on the Internet to set up a timer=1. "You can force use of the timer interrupt by using the timer=1 module arameter (or oprofile.timer=1 on the boot command line" When I type "modprobe oprofile timer=1" at the command line, I got a warning message saying that "Deprecated config file /etc/modprobe.conf" So i want to try other way by setting it at the boot command line.
