General :: Boot - Maximum Vmalloc Parameter Size?

May 31, 2011

First off all, I'm booting from a large MEMDISK using PXE (900MB) . Due to our environment, I cannot decrease the size, nor move files to a nfs/iSCSI/... environment. Everything needs to be in that MEMDISK.

Now, when I try to run the OS, I get out of vmalloc space. How do I increase it to a number which allows such a large image to be mapped? I tried the parameter "vmalloc=1280M", but with that parameter, I don't get past the Booting the kernel screen.

Memory should not be an issue, since the machine(s) have at least 2GB RAM. (900MB MEMDISK + 256MB for other kernel stuff + 768MB for user stuff). The machine(s) have a Pentium 4 Extreme Edition processor, with hyperthreading and SSE2, but no EM64T.

How can I boot the system, and get past that message? Decreasing the MEMDISK size is not possible too. It is at the smallest we can get with our userland + kernel + modules.

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General :: Trash Has Reached Maximum Size

Mar 8, 2011

When I try to delete a file, ( move to trash ) It says , The trash has reached It's maximum size! clean the trash manually. When I click on the trash icon on desktop it is empty. Where is the trash? Where can I delete these files ?

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General :: Changing Maximum Shared Memory Size

Jul 17, 2011

How do I change the size of the available shared memory on Linux?evidently 4GB is not enough for what I am doing (I need to load a lot of data into shared memory - my machine got 8GB of RAM).

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General :: 512KB Maximum Transfer Size Per Command?

Apr 7, 2011

I'm using fc14 and the SG driver to test some SCSI (SAS) targets. In doing so, I'm bumping up against what appears to be a 512KB maximum transfer size per command. Transfers up to 4MB sometimes work, but often they result in ENOMEM or EINVAL returned from the write() function in the SG driver. I could not find any good documentation on how the SCSI system in Linux works so I've been studying the source for drivers in drivers/scsi.

I see that there is a scsi_device struct that contains a request_queue struct that contains a queue_limits struct that contains an element called max_sectors. The SG driver seems to use this to limit the size of the reserve buffer it is willing to create. I see that there are several constants used to initialize max_sectors to 1024 which would result in the 512KB limit I see (with targets having 512 byte sectors). At this point I have several questions:

1) When the open() function for the sg driver gets called, who initializes the scsi_device struct with the default values?

2) Can I merely change the limits struct to arbitrary values after initialization and cause the SG ioctls to set the reserve buffer to allow greater values?......

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General :: Find Out Maximum Size Of A Image Disk File Created By Kvm-img?

May 22, 2011

I created a VM disk image with kvm-img, but I forget what was the max size of that disk image when I created it. Currently, its size is 6.2G, I want to install some large packages in that VM, so I want to make sure the disk image can expand to an adequate size.

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General :: Break Copy Process When Folder Size Reaches Its Maximum?

Mar 19, 2011

I have written a script.

a=`du -sh /root/samplefolder | cut -f1`
echo $a > testfile


The aim of this script is, when the folder reaches 20M then attributes will be set to that particular folder so that no newfiles and folders cannot be created or copied to that samplefolder. whenever i copy a file morethan 20M to that folder its getting copied fully and then the attributes were applied. But i dont want this to happen, when the folder reaches its maximum current write operation to that folder should be stopped automatically with a error.

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General :: Squid Cache_dir Hard Disk Space Reaching The Maximum Size?

Jan 20, 2010

I have set up squid server. My cache directory has been set up as per following statements.cache_dir ufs /Cache1/squid 10000 16 256cache_dir ufs /Cache2/squid 10000 16 256Now the problem is that size of /Cache1 and /Cache2 has reached to about 8GB and in near future it will reach the maximum limit of 10GB. I just want to know that whether I need to delete the contents of these directories or otherwise.

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General :: Don't See -k Parameter In Recent Modprobe (missing Parameter)

May 4, 2010

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.

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Hardware :: Mkpart With Maximum Size Available?

Feb 2, 2010

how to mkpart with maximum size available?

mkpart primary 0 3001G

I have 3TB raid disk. I cannot install centos using GPT partition. I need to use parted and mkpart to format it.

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General :: Set Parameter At The Boot Command Line?

Aug 20, 2010

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.

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Ubuntu Servers :: Set Maximum Attachment Size?

Jun 4, 2011

I use U-server. I set up an mail server as described in Ubuntu Documentation > Ubuntu 11.04 > Ubuntu Server Guide > Email Services.

How can I turn off maximum attachment size. On my server I don't want to limit the size of e mails that arrives.

I manage my server with webmin

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Server :: Loopback Device - Maximum Size

Sep 24, 2010

This seems like a relatively simple question, but the answer seems to elude everyone: What is the MAXIMUM SIZE of a Linux loopback device (not counting any specific filesystem limitations)? Is it the maximum size of a linux block device?

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Programming :: Maximum Heap Size For A Process?

Mar 15, 2011

Is there any maximum limit to the heap memory allocation?My program is in PERL and i am using a solaris system. when i did "pmap pid" (pid = my process id) it is showing a number of heap memory allocated and all of them with GB sizes. This single process is eating up most of the physical memory.Is it normal and is there any way to get the heap memory size down

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CentOS 5 :: Find Out Maximum I/O Request Size?

Nov 28, 2009

How do I find out maximum I/O request size?

I'm using CentOS release 5.2

I know that the default size is 128 K, how do I find out/confirm this?

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Programming :: Restrict The Perl Array Maximum Size?

Feb 9, 2010

How to restrict the maximum size of an array variable in perl such that Ishould not be able to have array elements beyond the maximum size?

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Ubuntu :: Maximum Allocatable Heap Size For A Process?

Mar 30, 2010

I'm wondering what's the maximum heap space a process can use (not necessarily by a single malloc()) in Ubuntu x86_64. Which parameter determines the size

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General :: Pass Options To A Kernel Module Through The Boot Parameter?

Nov 4, 2010

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?

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General :: Clearing Of Memory Allocated By Using Malloc/kmalloc/vmalloc

Aug 8, 2011

Let's analyse this While registering a Char deriver to kernel think that we had allocated memory using any of malloc/kmalloc/vmalloc.

If we forgot to Free that allocated memory while unregistering, will that memory be allocated aside or kernel clears it...?

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General :: Where Does The Kmalloc/Vmalloc/get_free_pages/malloc Allocates Memory

Jul 27, 2011

clarrify the below points:1) Where does the Kmalloc/Vmalloc/get_free_pages/malloc Allocates memory in which space is it Kernel/User?2) Coming to Hardware Point of View is where Kernel/User Space Memory Allocates is it in RAM or any.?3) In Device Drivers, how Open Call get to know whether the hardware is connected/not?

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Software :: Both GThumb And Geeqie Image Viewers Have Limited Maximum Size For Thumbernails?

May 22, 2010

Both gThumb and Geeqie image viewers have limited maximum size for thumbernails. Is there any way to work with bigger thumbernails (or slide photos)?

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Software :: Unknown Parameter Encountered: "max Log Size"

Jul 4, 2011

I had installed ubantu 11.04 and checked samba which is already installed in the system but when i start the service it asked me to install samba4, so i had installed samba 4 also.

after configuring smb.conf i had restarted the samba service and it giving me following error

Unknown parameter encountered: "max log size"
Ignoring unknown parameter "max log size"
Unknown parameter encountered: "syslog"
Ignoring unknown parameter "syslog"


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Ubuntu :: Boot Parameter Meanings And How To Implement

Jan 23, 2011

There are several boot parameters shown when pressing the F6 key on the Ubuntu Maverick Alternate install CD. For example: ACPI=OFF


Where do I find a "complete" explanation of what these parameters do, when it is appropriate to select them and HOW to select them?

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OpenSUSE Install :: 11.3: Where To Adjust X11 Timeout Parameter Affecting Boot

Mar 13, 2011

Computer boots up fine, but drops to commandline as it tries to go to the desktop. Just logging in and issuing "startx" brings up the desktop and all is well.

The Xorg logfile gives no fatals or clues (at least to me), but the "warn" file in /var/log gives the following at the end:

Mar 13 13:25:43 xxxxxxxx kdm[2328]: X server startup timeout, terminating
Mar 13 13:25:43 xxxxxxxx kdm[2328]: X server for display :0 can't be started, session disabled

Yesterday was fine, and never had it before; no harware changes (still same ATI 4770 and ATI 11.2 driver), nor BIOS changes/updates, for ages. First boot today this started. Does it continuously.

how I might slightly increase X's timeout parameter a bit, if this is the problem?

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Ubuntu Installation :: Editing Grub For Vmalloc?

Jul 26, 2010

I want to edit a grub file, but none of the online instructions exactly match my files. I'm trying to follow the instructions to add vmalloc=256M to a grub file, from here:


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Debian :: Laptop Brightness Gets Set To Maximum On Boot

Jun 10, 2010

My laptop brightness gets set to maximium each boot.

Just wondering if this is the case for other laptop users. I have a Lenovo Thinkpad SL500 (GeForce 9300M GS) and am running Testing.

Ideally I'd like it to remember my last setting (which is usually the lowest). It'd be nice not having to turn it down each time I reboot/power-on.

It actually starts off at a low setting but during the boot process (before gdm and just after the "Waiting for /dev" line I believe) it suddenly gets set to max.

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Debian Hardware :: CPU Frequency Always Maximum After Boot

Aug 1, 2014

I have both cpufrequtils and acpi-whatevercpu, normally processor would be correctly controlled by the ondemand governor and have two steps for frequency, 1.4 and 3.5GHz. Now I've noticed my frequency is always at 3.5GHz, cpufreq-info gives me the hint:

Code: Select allguiu@guiu-desktop:~$ cpufreq-info --cpu 0
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to


This isn't really a big issue. Normally the processor will sit at +-28°C at low load levels at maximum frequency, with the proper governor it will drop to +-20°C (room temperature) and lower. So I still would like to get proper management of frequencies for more hardware life, and better energy efficiency, not to mention quieter fans. Documentations on cpufrequtils is very broad, and apart from that I don't know where to look for this. Debian wiki page mentions about a file that can be used to configure this but there isn't much documentation.

Ps: I previously had this issue where acpi-cpufreq driver wouldn't load at all, this is due to setting on bios resulting in different frequencies than stock, trying to get default frequencies allowed the driver to work.

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General :: What Is 'positional Parameter'?

Mar 21, 2011

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.

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General :: Shutdown Parameter 't' Functionality How-to?

Dec 28, 2010

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?

Code:# shutdown -h +1

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General :: How To Change Kernel Parameter

Oct 11, 2010

i m using following kernal.


# uname -r

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.


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"


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General :: Receive Files Sent As A Parameter?

Feb 26, 2011

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

for (i=1;i<$#;i++)
cat ${i} //help me here
echo do u want to proceed


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