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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.

Albin Tonnerre, Free Electrons
Kernel, drivers and embedded Linux development,
consulting, training and support.

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