Hi, D'ar meurzh 19 a viz Eost 2014 e 19 eur 55, « Rusty Russell » he deus skrivet : > 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. Thank you Andi and Rusty for the feedback. I'm current updating patches to drop -9 usage. -- Beber -- 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
