swap space

Home › Forums › MultiConnect OCG › swap space

Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
    Posts
  • November 14, 2011 at 8:34 pm #2671
    Brandon Pedersen
    Participant

    Is there any swapping done on the CDP? I don’t have a firm grasp on swapping in general but I know that the programs I am using right now are using a lot of memory and I believe adding some swap space might help. I am receiving a lot of low memory kernel warnings in the sys log. Would it be possible to partition the root disk to provide swapping? or possibly the sdcard? Or is this a dumb question? 🙂

    November 16, 2011 at 3:14 pm #3537
    Jesse Gilles
    Blocked

    You can technically enable swapping, but I would definitely NOT do this with the root device (NAND flash). It will be very very slow and will wear out the flash part much faster.

    You could investigate trying to use the SD card for this purpose. It will be much easier to setup and it should work just fine, but again, it will be slow (it’s no hard drive).

    November 16, 2011 at 6:37 pm #3538
    Brandon Pedersen
    Participant

    OK, I created a swap partition on the sd card and tried using it but I get:

    # swapon /dev/mmcblk0p2

    swapon: /dev/mmcblk0p2: Function not implemented

    It appears swap functionality is not enabled in the kernel. So I edited openembedded/recipes/linux/linux-2.6.32/mtcdp/defconfig and added:

    CONFIG_SWAP=y

    I then did ‘bitbake linux’ (after upping the revision number) and the built my image. After flashing I get the same error message though. I think I missed a step somewhere…how do I pick up changes to the kernel config and re-build it?

    November 16, 2011 at 7:47 pm #3539
    Jesse Gilles
    Blocked

    Hm, sounds like you did the right thing. If you modified defconfig, and then increased “PR” in the linux_2.6.32.bb and ran ‘bitbake linux’, it should have built a new kernel with your updated config.

    The image should be at build/tmp/deploy/glibc/images/mtcdp/uImage-mtcdp.bin.

    You can verify that your defconfig change took effect by looking in the work directory. Assuming you increased PR to ‘9’, it should be in

    build/tmp/work/mtcdp-corecdp-linux-gnueabi/linux-2.6.32-r9

    November 16, 2011 at 9:28 pm #3540
    Brandon Pedersen
    Participant

    OK, I did get it to work…not sure what happened but my change to the defconfig wasn’t there (in the source defconfig, and in the built version)…went back and added it back in and now it is working

    thanks

  • Author
    Posts
Viewing 5 posts - 1 through 5 (of 5 total)
  • You must be logged in to reply to this topic.