Andi Kleen <andi@xxxxxxxxxxxxxx> writes: > Bertrand Jacquin <beber@xxxxxxxxxxxx> writes: >> >> +# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed >> +# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP >> +# or CONFIG_MODULE_COMPRESS_XZ. >> + >> +mod_compress_cmd = true >> +ifdef CONFIG_MODULE_COMPRESS >> + ifdef CONFIG_MODULE_COMPRESS_GZIP >> + mod_compress_cmd = gzip -n -9 > > Please don't use gzip -9. The gain is very small, but it can make > the time to compress much longer. Just use plain gzip. Interesting: $ time find * -name '*.ko' | xargs -n 1 gzip real 0m9.404s user 0m7.283s sys 0m1.667s $ du -c `find * -name '*.ko.gz'` | tail -n1 56412 total time find * -name '*.ko' | xargs -n 1 gzip -9 real 1m1.968s user 0m58.850s sys 0m1.786s $ du -c `find * -name '*.ko.gz'` | tail -n1 55764 total $ time find * -name '*.ko' | xargs -n 1 xz real 1m23.396s user 1m13.893s sys 0m9.134s $ du -c `find * -name '*.ko.xz` | tail -n1 46868 total $ time find * -name '*.ko' | xargs -n 1 xz -9 real 1m47.202s user 1m25.962s sys 0m21.298s $ du -c `find * -name '*.ko.xz` | tail -n1 46868 total So, Andi is right. Please skip -9 for both options: it makes little (.gz) or no (.xz) difference and it slows things down. Cheers, Rusty. -- 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
