> > > 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? The loading time for bootloader can be longer as size increased, but that depends on which media it uses. For our usecase, it's not a big problem. As we run the kernel in virtual machine and lunch thousands of instances in the same physical machine so only the first instance needs to read from the file and later we just copy the memory. The thing that really matters for us is how fast we can boot for majority of the instances. > > 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? Exactly, LZ4 is the fastest. It takes 16ms to complete the decompression. Still sounds a little longer when compared to uncompressed kernel. Chao -- 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
