On (03/23/17 08:07), Yinghai Lu wrote: > On Thu, Mar 23, 2017 at 5:51 AM, Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx> wrote: > > Compressed kernel has its own drawback: uncompressing takes time. Even > > though the time is short enough to ignore for most cases but for cases that > > time is critical this is still a big number. In our on-going optimization > > for kernel boot time, the measured overall kernel boot time is ~90ms while > > the uncompressing takes ~50ms with gzip. > > > > The patch adds a 'CONFIG_KERNEL_RAW' configure choice so the built binary > > can have no uncompressing at all. The experiment shows: > > > > kernel kernel size time in decompress_kernel > > compressed (gzip) 3.3M 53ms > > uncompressed 14M 3ms > > How about the time difference for bootloader to read kernel from > flash/disk/network to ram? there are also faster de-compressors than gzip out there. LZ4, for instance. LZ4, as far as I remember, can be quite fast, like ~10 times faster than gzip. have you tested it? -ss -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
