Background..
With any linux system i build first thing i do is remove the journal from all my EXT4 partitions, to make a long story short ( i wont bore you with details of just how journal writes totally slow disk i/o , google it ) this gave me on average a 25% increase in system speed ( obviously due to the increased i/o rate )
I usually did it with
before installing the distro, now i thought hey maybe this would work on android?
Now mke2fs is not well supported on arm but tune2fs is! in fact its included in TWRP 2.5 so
( for the system partition) should work right , and in fact yes it does !!!, tried it from TWRP command line and hey presto %^$%^$^%$ FAST system
This is the code for a recovery script version
And i include a zip for those who like to test
Ps have not checked the function of this line
the bash equivalent is
where ^has_journal is a parameter of -O not sure the recovery script is wrapping that correctly, if anyone flashes this script could you please check by typing
in the TWRP terminal, scroll upward with an up finger swipe and check has_journal is not in the filesystem properties ( going to do it myself on next system wipe, but just enjoying the speed at the mo !! , am testing it on PRIME 04-20 mildly tweaked by me )
Thanks
Edit ... Since there has been more than passing interest in this obscure piece of code i have decided to tidy this post up
Hence now there are 2 scripts, one to remove the journal from your ext4 partitions, and one to re-instate the journal, this should allow people to test their setup with each without any wiping or reformatting
Instructions.......
( tested with TWRP 2.5+ only )
Flash the bugger :)
DO NOT WIPE ANYTHING, after flashing, doing so will only reformat the wiped partition with a journal
With any linux system i build first thing i do is remove the journal from all my EXT4 partitions, to make a long story short ( i wont bore you with details of just how journal writes totally slow disk i/o , google it ) this gave me on average a 25% increase in system speed ( obviously due to the increased i/o rate )
I usually did it with
Code:
mke2fs.ext4 -O ^has_journal ...device...Now mke2fs is not well supported on arm but tune2fs is! in fact its included in TWRP 2.5 so
Code:
tune2fs -O ^has_journal /dev/block/platform/sdhci-tegra.3/by-name/APPThis is the code for a recovery script version
Code:
ui_print("test script");
ui_print("");
ui_print("");
ifelse(is_mounted("/system") == "/system", unmount("/system"));
ifelse(is_mounted("/cache") == "/cache", unmount("/cache"));
ifelse(is_mounted("/data") == "/data", unmount("/data"));
ui_print("converting partitions to ext4 minus journal");
ui_print(" ");
set_progress(1.000000);
ui_print("e2fsck system partition");
ui_print(" ");
run_program("/sbin/e2fsck", "-p", "/dev/block/platform/sdhci-tegra.3/by-name/APP");
ui_print("e2fsck data partition");
ui_print(" ");
run_program("/sbin/e2fsck", "-p", "/dev/block/platform/sdhci-tegra.3/by-name/UDA");
ui_print("e2fsck cache partition");
ui_print(" ");
run_program("/sbin/e2fsck", "-p", "/dev/block/platform/sdhci-tegra.3/by-name/CAC");
ui_print("now lets rub out those nasty journals");
ui_print(" ");
run_program("/sbin/tune2fs", "-O", "^has_journal", "/dev/block/platform/sdhci-tegra.3/by-name/APP");
run_program("/sbin/tune2fs", "-O", "^has_journal", "/dev/block/platform/sdhci-tegra.3/by-name/UDA");
run_program("/sbin/tune2fs", "-O", "^has_journal", "/dev/block/platform/sdhci-tegra.3/by-name/CAC");
ui_print("and re-fsck to clean any set bits");
ui_print(" ");
ui_print("e2fsck system partition");
ui_print(" ");
run_program("/sbin/e2fsck", "-p", "/dev/block/platform/sdhci-tegra.3/by-name/APP");
ui_print("e2fsck data partition");
ui_print(" ");
run_program("/sbin/e2fsck", "-p", "/dev/block/platform/sdhci-tegra.3/by-name/UDA");
ui_print("e2fsck cache partition");
ui_print(" ");
run_program("/sbin/e2fsck", "-p", "/dev/block/platform/sdhci-tegra.3/by-name/CAC");Ps have not checked the function of this line
Code:
run_program("/sbin/tune2fs", "-O", "^has_journal", "/dev/block/platform/sdhci-tegra.3/by-name/APP");Code:
tune2fs -O ^has_journal /dev/block/platform/sdhci-tegra.3/by-name/APPCode:
tune2fs -l /dev/block/platform/sdhci-tegra.3/by-name/APPThanks
Edit ... Since there has been more than passing interest in this obscure piece of code i have decided to tidy this post up
Hence now there are 2 scripts, one to remove the journal from your ext4 partitions, and one to re-instate the journal, this should allow people to test their setup with each without any wiping or reformatting
Instructions.......
( tested with TWRP 2.5+ only )
Flash the bugger :)
DO NOT WIPE ANYTHING, after flashing, doing so will only reformat the wiped partition with a journal