Resend the email using plain text. I found some kernel performance regression issues that might be related w/ 4.14.y LTS commit. 4.14.y commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v4.14.253&id=27d185697322f9547bfd381c71252ce0bc1c0ee4 The issue is observed when "console=" is used as a kernel parameter to disable the kernel console. I browsed android common kernel logs and the upstream stable kernel tree, found some related changes. printk: handle blank console arguments passed in. (link: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.14.15&id=3cffa06aeef7ece30f6b5ac0ea51f264e8fea4d0) Revert "init/console: Use ttynull as a fallback when there is no console" (link: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.14.15&id=a91bd6223ecd46addc71ee6fcd432206d39365d2) It looks like upstream also noticed the regression introduced by the commit, and the workaround is to use "ttynull" to handle "console=" case. But the "ttynull" was reverted due to some other reasons mentioned in the commit message. Any insight or recommendation will be appreciated. Thanks, Yi Fan
