Ubuntu Multimedia :: Virtual Screen Too Big For Memory?
Dec 3, 2010
I'm trying to set up an older computer for a friend that does not have one I've been using Ubuntu for a little over a year on a couple of systems, and this is the first time I have come across an issue I could not find an answer to. During the boot sequence, and right before the GUI, I'm getting a "Low Graphics Mode" warning and it tells me that the "Virtual screen too big for memory; 5120k needed, 4096 K available" then it gives me some options, and the only one that seems to lead me anywhere is the "Load Ububntu in low res mode this once" Ironically, once the Ubuntu GUI is booted up, the screen resolution is fine (1280x1024 actually - but it is an unknown monitor) This happens every time I re-boot the system and is more of an annoyance then anything else, but since its to be a gift I'd like to get rid of this error message.
I am using malloc and frees a lot in my program. It shows its allocated but when i remove it doesnt show as the memory is removed(I am using the top command to view VIRT memory usage). If this continously grows what would happen to my program (Will it go out of memory?)
we found that if we use 'top' to show the memory usage of a server (SuSe Linux 10), we can get virtual memory usage as well as 'Resident memory' usage. For virtual mem or a particular process, it is around 1.1GB, which is large but for resident memory, it only consumes 300MB. Are there anyone who knows what the differences are? I would also like to know whether the difference (1.1GB - 300MB) = 800MB are actually available for use by other applications in the system.
I have a query regarding top & virtual memory. When we run top it show VIRT (Virtual Mem), RES (Resident Mem) & SHR (Shared Memory). The total virtual memory of my machine is 4 GBs (2 GB RAM + 2 GB Swap), but still I am able to see a process showing 4000m virtual memory column. what it means, as its show VIRT Mem more than actual available VIRT memory
What command would I use with Top to sort what is displayed when typing top to see the virual memory in a vm? So I am currently running ubunut 10.10 in a vm and I want to run top and display the virtual memory, what sort command would I include with top?
I understand that in linux virtual memory would be the same as swap and I also understand that linux only uses swap when your computer has used all your pc memory. I hope both assumption are right.Can I make a process like firefox use ONLY virtual memory/swap? No access to RAM.
I used to use server 64, and it handled memory well with Jaunty and Karmic but with Lucid the memory usage is always high and can't run virtual machines.
Wine is useless on one of my computers running lucid 32bits. If i try to run a program through wine or even winecfg I get the error:
wine: virtual memory exhausted
I have tried shredding all the files in the .wine directory, removing every package that have anything with wine in their name in synaptic, and sudo aptitude purge wine.
I am running a series of tests for an implementation of a remote pager that sends page faults to other computers in a network. Long story short, I was wondering if there is an easy way to force a process to use virtual memory as oppose to physical RAM so that I can better measure the performance of my implementation against how the system would perform while swapping to the hard drive.
I have a Red Hat 5.3 virtual machine that has 3GB memory. I just upgraded the memory to 4GB, however when I run free -m it still only recognizes 3GB. Is there something else I need to do?
A process is trying one access to memory, for example through an array (ex.: vect[0]=123. What happens?
Here below what I guess but I'm not sure and accept any comment (please, distinguish between "the system" and "the CPU" in case).
Let's suppose swapping to disk disbled.
We have two scenarios: without and with cache.
If no cache is present in the system: 1. The CPU must discover the phys addr of vect[0] virtual addr. To do that, has to read from 3 (or 2 depending on the system?) pages tables, stored in memory as well. 2. The CPU writes to the final address.
These mean 4 memory accesses.
If cache is present: 1. Like above but, if the pages tables are in cache, we have 3 accesses to that. 2. If the req. page is not in cache, it's reads from ram and transferred to it. Afterwards, cache is written. In the best case we have 4 cache accesses.
We have designed a board with Cirrus Logic(arm) processor, A Flash memory and some other peripherals have been connected to that. While building kernel we have selected MMU support. We have written few custom drivers for keypad,LED,LCD. But I would like to know how virtual memory mechanism can be helpful here even though there is no any hard disk has been connected. Where will be the virtual memory reside.
I have a 32 bit Ubuntu installed and my Laptop has 4GB RAM, but only 3GB is considered by Linux. My question is: what is the reason for the upper limit on physical memory ?
Code: dmesg | grep Memory [0.000000] Memory: 3052428k/3112960k available (4673k kernel code, 56364k reserved, 2121k data, 656k init, 2200904k highmem) I am familiar with the virtual memory concept where linux splits upper 1GB for kernel and lower 3GB for user processes. In total, linux 32bit can address 4GB virtual addresses. Does this meant that 1GB of physical memory is already mapped to 1GB of kernel space and Linux only shows the remaining 3GB physical memory left for the user in the above command.
I did some searching on the internet and found some articles related to this, but it only confused me further since some articles suggest 4GB is the upper limit with mentioning whether it's virtual or physical memory, some bring in the concept of PAE, etc. I'm relative new to Linux's memory management, so it'd be really helpful if someone could answer this.
I'm running Fedora 11 (2.6.30.10-105.2.4.fc11.i686.PAE) 8 GB memory on a AMD Phenom(tm) II X4 965 Processor, 4 core server I just built.The problem I have run into is any virtual machine that has >1024 MB memory assigned to it will not boot. As along as it has 1024 MB or less it boots fine.The symptom you see is a very quick message "Booting from hard disk" the screen then goes blank, you can't login through SSH, and can't ping the network address so I know it's not some crazy video problem hiding the boot process.The attachment are messages from a failed boot attempt.
I have windows installed through virtual Box now but i have some questions. When i make it full screen it goes full screen but Windows stays in the middle of the screen small and doesn't adjust to the full screen. Can you make windows completely take up the full screen Can i access folders on my ubuntu drive ? i have a file in downloads i want in windows but don't want to reinstall it
As i undertsand - out of 1GB of the virtual Address space for Kernel from 3GB to 4GB of the process address space, Kernel image (code, data, bss, stack, heap) resides staring @0x0 address. Vmalloc area starts either at the end of Physical ram size or at 896M. This 896M cap is mandated to ensure that minimum of 128MB is reserved as vmalloc_reserve for vmalloc,kmap etc.
Is the understanding correct? Now trying to map Physical Zones into this 1GB address space
Initial 16MB is mapped to ZONE_DMA 16MB - 896MB is mapped to ZONE_NORMAL 896MB - 1024MB is mapped to ZONE_HIGHMEM
Does this mean that Kernel image is residing in ZONE_DMA area? Any call to vmalloc() in kernel code will return address beyond 896M? insmod of any LKM will internally invoke vmalloc() to obtain contiguous area - where will this code physically located along with rest of kernel code in ZONE_DMA or in ZONE_HIGHMEM?
I get errors trying to virtual IPv6 Addresses i a lab environment. It works fine up to 2033 (?) adrressses, but when I try to add more i get "Cannot allocate memory" error:
I'm got ubunt-desktop running VirtualBox. I installed MS XP HOME on a virtual disk. so everything *works* .. but I'd be a lot happier to have the box opened up all the way to my Ubuntu top-and-bottom bars.
When I installed 10.04 in April, I started having all sorts of problems with my Virtual Terminals (CTRL-ALT-F*). First they were inaccessible completely, then they were there, but not visible, i.e. I could use them to login and run commands, but there was no screen output, then they were gone again, and the fight just went on and on. I just recently got this functionality back after months just messing around, testing different peoples solutions, and really just not being afraid to break the whole thing. Ultimately, it boiled down to nVidea graphics driver problems.
However, now I notice that outside of gdm, the screen is not aligned properly. It seems to be about 2 characters to the left and several lines lower than it should be on VT1-VT6, while gnome is aligned perfectly. I can use my screens auto-adjust to fix the problem, but when I switch to another terminal, the problem comes back. It's not really a huge deal, but after all this trouble, I really just want them to work the way they are supposed to work. Does anyone know of a way to set the screen alignment via software, or am I just stuck dealing with it?
I am using Ubuntu 10.10 on a Dell Optiplex GX270, with the Intel video chip. I have a problem with my virtual consoles/terminals (<ctrl-alt>F1-F6). The default screen resolution was set to 1600x1200 at installation, which results in a nearly microscopic, unreadable font. I posted the problem on this thread on ubuntuforums.org, where they suggested adding GRUB_GFXMODE=640x480 and GRUB_GFXPAYLOAD_LINUX=640x480 to /etc/default/grub and /etc/grub.d/00_header. Still no joy--the console screen resolution still was 1600x1200.
I have noticed that the screen resolution changes three times during boot; it starts at standard VGA, 640x480, then switches to 1600x1200, then finally to 1024x768, which is my preferred resolution in X. But, if I switch to a virtual console, the resolution shoots up to 1600x1200 again. There are times when I like to use virtual terminals, and I would like to avoid eyestrain.
I'm running Ubuntu with Sun Virtual Macine on my Mac OSX and I have two problems.Somhow I have managed to get the Ubuntu screen to go completely black with a bash command line in the centre of it and the characters: "tty6" at the top of it. How do I exit this??Also I have a file on this virtual machine. Does anyone know how i would put this on my mac without the use of a Pen drive?
I am new to slackware, but not new to linux. I recently installed slackware 13.37, and am enjoying it very much so far. The most annoying problem I currently have is that, after starting X, I cannot switch to a virtual terminal or even end X without having a problem. For instance, from the GUI if I hit ctrl-alt-F1, instead of going to the 1st virtual terminal, the screen fades quickly to black and does not return. I have not been able to make any progress on this problem, so any input would be greatly appreciated.The only thing worth noting really is that I'm using Fluxbox as my default window manager. Other than that I haven't done a lot of modifications to the base system other than installing some basic packages, but I had this problem since booting directly after installation of the os.
Since I installed Natty on my laptop, some strange behavior occurs. When I open up a file in VLC all is well, I can maximize the window, but then when I go full-screen it starts to eat up all my memory! Including my complete SWAP partition. Rendering my laptop unresponsive......... It doesn't do it all the time though. I have to add to this that I have had this exact same problem with SKYPE, but that doesn't seem to occur anymore. Could it be that certain VLC settings have new defaults or maybe a driver issue?
virtual console (run level 3,5) screen resolution. After installing fed12 the resolution is higher(which is good) then in previous versions. After upgrading from 11 -> 12 the resolution of the virtual consoles stays the same, to large. I already compared grub.conf,i18n which are the same. Where is the resolution configuration for fed 11,12?
