12603 2018-03-14 03:48:46 +0000 Performance regression with new kernel upgrade 2018-03-15 07:54:27 +0000 1 1 7 Build System, Metadata & Runtime OE-Core kernel 2.5 x86 Multiple RESOLVED FIXED Undecided normal --- 1 ross.burton bruce.ashfield tom.zanussi --- --- No (bug/feature does not impact docs) oldest_to_newest 79808 0 ross.burton 2018-03-14 03:48:46 +0000 Since the last kernel upgrade in oe-core 62acf087dca83ff094b1c0300b5752978807ca17 the speed of building the kernel changed massively. buildstats-diff output of the that commit and before the kernel bumps: PKG TASK ABSDIFF RELDIFF CPUTIME1 -> CPUTIME2 linux-yocto do_package 22.3s +194.7% 11.5s -> 33.8s linux-yocto do_deploy 30.1s +1557.3% 1.9s -> 32.0s linux-yocto do_package_write_ipk 135.0s +348.8% 38.7s -> 173.7s linux-yocto do_compile_kernelmodules 142.0s +17.8% 799.7s -> 941.8s linux-yocto do_package_write_rpm 158.9s +574.1% 27.7s -> 186.6s linux-yocto do_compile 174.7s +18.7% 933.3s -> 1108.0s Longer to compile, a lot longer to deploy and package. 79809 1 ross.burton 2018-03-14 05:42:49 +0000 The problem is the 'linux-yocto: aufs and systemtap' commit which enables CONFIG_KERNEL_DEBUG. packages/qemux86-poky-linux/linux-yocto/kernel-vmlinux: PKGSIZE changed from 19587044 to 300944172 (+1436%) Yes, that's 19M to 300M. 79811 2 bruce.ashfield 2018-03-14 05:54:33 +0000 I'll revert the patch that enabled debug, and send it along shortly. 79828 3 ross.burton 2018-03-15 07:54:27 +0000 Fixed in oe-core ad8f68e9831c57fde62f7b1942bfa9e1307f113d