Linux 4.20 kernel , Severe Performance Penalties for Intel Processors

Linux 4.20 Showing Some Performance Slowdowns
https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.20-Initial-Slowdowns

More Benchmarks Of The Performance Pullback In Linux 4.20
https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.20-Performance-Pullback

Bisected: The Unfortunate Reason Linux 4.20 Is Running Slower
https://www.phoronix.com/scan.php?page=article&item=linux-420-bisect&num=1

The Spectre/Meltdown Performance Impact On Linux 4.20, Decimating Benchmarks With New STIBP Overhead
https://www.phoronix.com/scan.php?page=article&item=linux-420-stibp&num=1

Linux Gaming Performance Can Be Impaired By STIBP, But Hope May Be On The Horizon
https://www.phoronix.com/scan.php?page=news_item&px=Linux-Gaming-STIBP

Linux 4.20-rc3 Kernel Released
https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.20-rc3-Released

Linus Torvalds Comments On STIBP & He's Not Happy - STIBP Default Will End Up Changing
https://www.phoronix.com/scan.php?page=news_item&px=Linux-Torvalds-STIBP-Comment

Spectre Patches Whack Intel Performance Hard With Linux 4.20 Kernel
https://www.extremetech.com/computing/280857-spectre-patches-whack-intel-performance-hard-with-linux-4-20-kernel

Linux Spectre V2 Patch Incurs up to 50 Percent Performance Penalty
https://www.tomshardware.com/news/linux-spectre-patch-50-percent-performance-penalty,38099.html


Phoronix 作了不少測試
發現在目前的 Linux 4.20 Kernel 下
Intel 處理器效能大減
原因大約是 Linux 4.20 Kernel 加入針對 Spectre/Meltdown 的更新修正
嚴重影響了 Intel 處理器