On Mon, 2017-03-27 at 15:25 +0200, Arnd Bergmann wrote: > On Mon, Mar 27, 2017 at 1:47 PM, Michal Marek <mmarek@xxxxxxxx> wrote: > > > > Dne 27.3.2017 v 09:58 Sebastian Andrzej Siewior napsal(a): > > > > > > On 2017-03-24 13:35:40 [+0800], Chao Peng wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > kernel kernel size time in > > > > > > > decompress_kernel > > > > > > > compressed (gzip) 3.3M 53ms > > > > > > > uncompressed 14M 3ms > > > > > > > > > > Exactly, LZ4 is the fastest. It takes 16ms to complete the > > > > decompression. Still sounds a little longer when compared to > > > > uncompressed kernel. > > > > > > Are we seriously talking here about one-time improvement of 13ms > > > boot time? > > > > If the use case is launching new VM instances continuously, then > > compressing the kernel image is about as useful as compressing > > /bin/bash. > > I guess the next step would be to use CONFIG_XIP_KERNEL on x86, > which requires an uncompressed kernel but has the additional advantage > of sharing the read-only sections of the kernel image across virtual > machines, resulting in better RAM and cache usage. That is something we wanna look into :) 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
