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    SubjectRe: [PATCH 4/6] Add support for LZO-compressed kernels for ARM
    On Thu, Aug 06, 2009 at 11:40:55PM +0100, Russell King - ARM Linux wrote :
    > On Mon, Aug 03, 2009 at 04:58:19PM +0200, Albin Tonnerre wrote:
    > > This is the second part of patch. This part includes:
    > > - changes to ach/arch/boot/Makefile to make it easier to add new
    > > compression types
    > > - new piggy.lzo.S necessary for lzo compression
    > > - changes in arch/arm/boot/compressed/misc.c to allow the use of lzo or
    > > gzip, depending on the config
    > > - Kconfig support
    >
    > FYI, with these patches applied and selecting GZIP method, I get
    > linker errors. I've been unable to track down what's going on, but
    > it appears to be a libgcc issue.
    >
    > In spite of the decompressor being built as an EABI object, gcc seems
    > to be issuing calls to __umodsi3, which isn't in the EABI libgcc
    > (they're called something different - don't ask.)

    Looks like this one is on its way to getting solved.

    > So I think these patches need further testing and evaluation on ARM
    > before they can be merged. Moreover, I'd like to see some comparisons
    > between the _current_ gzip method, the new gzip method and the lzo
    > method on ARM.

    The figures I posted with my patch were from an ARM (AT91SAM9263) 180MHz CPU.
    For the record (average on 25 boots with each compression method):

    Uncompressed size: 3.24Mo
    gzip 1.61Mo 0.72s
    lzo 1.75Mo 0.48s

    Some tests with the current gzip code give about 1.64s decompression time.

    Regards,
    --
    Albin Tonnerre, Free Electrons
    Kernel, drivers and embedded Linux development,
    consulting, training and support.
    http://free-electrons.com


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