[oe] [RFC] cpio.lzma compression level in bitbake.conf

[Khem Raj]

On (10/03/11 10:21), Andrea Adami wrote:
> Hello,
> 
> in bitbake.conf we use the maximum lzma compression level (-c -9) for
> the initramfs:
> 
> IMAGE_CMD_cpio.lzma = "type cpio >/dev/null; cd ${IMAGE_ROOTFS} &&
> (find . | cpio -o -H newc | lzma -c -9
> >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio.lzma)
> ${EXTRA_IMAGECMD}"
> 
> This makes decompressor fail on devices with 32Mb RAM (see
> http://paste.debian.net/110203/ ).
> Same kernel boots with compression set to -7.
> 
> Some figures can be obtained here:
> http://www.gsp.com/cgi-bin/man.cgi?section=1&topic=lzcat
> 
> It was suggested we should introduce something like
> LZMA_COMPRESSION_LEVEL or use internal tables to find better level
> from targets memory amount.
> In the meanwhile I think we should change the defaults in bitbake.conf.

I think this is something we can encapsulate in machine.conf files
so unless the general value in bitbake.conf does not fail for almost
all cases I would suggest to keep it and instead introduce a new
variable to control the level 
> 
> Opinions?
> 
> Andrea
> 
> _______________________________________________
> Openembedded-devel mailing list
> Openembedded-devel at lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-devel

-- 
-Khem