How to reduce rootfs image size?



Does the Yocto rootfs image size is based on real contents included in
the image-rootfs.tar.gz?

When I build the image with very large size of applications and
libraries such as boost, I have my about 44 MB,
then I removed all large size of applications and libraries, I changed
IMAGE_ROOTFS_SIZE to a small size IMAGE_ROOTFS_SIZE = 20000, I thought
the image-rootfs.tar.gz should be reduced to a small size, but it is
still 43 MB I don't believe it is that big, which variable I should
use to reduce the image size?

Thank you.

Kind regards,

- jh

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