Increase log_buf_len (Generic Intel)

**heitbaum** · November 28, 2020 at 12:06 AM

I would like to suggest increasing the default log_buf_len to 128K or 256K (not the 16M that I have on my dev unit)

The later 5.x kernels boot logs are no longer complete using the default ring buffer size.

# grep log /flash/syslinux.cfg

APPEND boot=LABEL=System disk=LABEL=Storage log_buf_len=16M quiet

# dmesg | wc

961 8316 65437

# uname -a

Linux LibreELEC 5.9.11 #1 SMP Thu Nov 26 12:54:34 UTC 2020 x86_64 GNU/Linux

Happy to raise a PR either as syslinux or CONFIG_LOG_BUF_SHIFT if this makes sense.

**mglae** · November 28, 2020 at 9:04 AM

When using CONFIG_LOG_BUF_SHIFT we can differ between platforms. I.e. using 128k for small memory RPI1 devices and 512k for most other.

**HiassofT** · November 28, 2020 at 9:34 AM

Most devices use the kernel default of 128k (CONFIG_LOG_BUF_SHIFT=17), not sure why Generic is set to 64k. Would be best if you created a PR and change it to 17, too

Code

hias@delle:~/private/libreelec/libreelec-git$ git grep CONFIG_LOG_BUF_SHIFT
projects/Allwinner/linux/linux.aarch64.conf:CONFIG_LOG_BUF_SHIFT=17
projects/Allwinner/linux/linux.arm.conf:CONFIG_LOG_BUF_SHIFT=17
projects/Amlogic/linux/linux.aarch64.conf:CONFIG_LOG_BUF_SHIFT=18
projects/Generic/linux/linux.x86_64.conf:CONFIG_LOG_BUF_SHIFT=16
projects/NXP/devices/iMX6/linux/linux.arm.conf:CONFIG_LOG_BUF_SHIFT=18
projects/Qualcomm/devices/Dragonboard/linux/linux.aarch64.conf:CONFIG_LOG_BUF_SHIFT=14
projects/RPi/devices/RPi/linux/linux.arm.conf:CONFIG_LOG_BUF_SHIFT=17
projects/RPi/devices/RPi2/linux/linux.arm.conf:CONFIG_LOG_BUF_SHIFT=17
projects/RPi/devices/RPi4/linux/linux.arm.conf:CONFIG_LOG_BUF_SHIFT=17
projects/Rockchip/devices/RK3288/linux/default/linux.arm.conf:CONFIG_LOG_BUF_SHIFT=17
projects/Rockchip/devices/RK3328/linux/default/linux.aarch64.conf:CONFIG_LOG_BUF_SHIFT=17
projects/Rockchip/devices/RK3399/linux/default/linux.aarch64.conf:CONFIG_LOG_BUF_SHIFT=17
projects/Samsung/linux/linux.arm.conf:CONFIG_LOG_BUF_SHIFT=17

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so long,

Hias