Hi, * Mighty M <mightymb17@xxxxxxxxx> [210430 07:49]: > I have a Samsung Galaxy Tab 2 which has an OMAP 4430 clocked at 1Ghz, > with that there is quite some difference in performance when comparing > the mainline and downstream kernels. To confirm my suspicions I ran > UnixBench(https://github.com/kdlucas/byte-unixbench) on both of them, > the results are as follows - > 1) Downstream (running SailfishOS) - Kernel Source - > https://github.com/CyanogenMod/android_kernel_samsung_espresso10, I > get a result of 580.4 in dual-core and 292.9 in single core. I > compiled UnixBench manually. > 2) Mainline (running PostMarketOS) - Kernel Source - > https://github.com/MightyM17/linux_openpvrsgx/tree/letux-pvrsrvkm-5.12-rc1, > when using UnixBench package from PostMarketOS repo, I get a score of > 352.7 dual core and 192.7 single core, and compiling it myself and > then running gives the score 415.1 dual core and 209.9 single core. > > The downstream scores are quite high even beating Droid 4 which has > CPU clocked at 1.2Ghz when Tab 2 has it at 1 GHz. > > Why is there so much difference in mainline and downstream and what > can be done to improve the performance. If you have a good test case, it would be nice to narrow down the performance issue and fix it. My guess is that the following might help with the mainline Linux kernel built with omap2plus_defconfig: - Disable CONFIG_DEBUG in .config - Disable CONFIG_ARCH_OMAP2 in .config to disable the build options for ARMv6 If the above does not help, then let's look further in the L2 settings for example. Regards, Tony
