A Nasty Performance Regression For Some Intel Systems Wound Up In Linux 6.5 Stable

Written by Michael Larabel in Software on 13 September 2023 at 04:00 PM EDT. Page 2 of 6. 5 Comments.
WebP Image Encode benchmark with settings of Encode Settings: Quality 100, Lossless, Highest Compression. Linux 6.4.14 was the fastest.

The WebP image encoding benchmark was one of the first tests encountered on this Intel Raptor Lake desktop where Linux 6.5 was slower than 6.4.

John The Ripper benchmark with settings of Test: bcrypt. Linux 6.4.14 was the fastest.
John The Ripper benchmark with settings of Test: WPA PSK. Linux 6.4.14 was the fastest.
John The Ripper benchmark with settings of Test: HMAC-SHA512. Linux 6.4.14 was the fastest.

But as more workloads ran, other software test cases even exhibited with even wider performance regressions on Linux 6.5 stable.

AOM AV1 benchmark with settings of Encoder Mode: Speed 6 Realtime, Input: Bosphorus 4K. Linux 6.4.14 was the fastest.
AOM AV1 benchmark with settings of Encoder Mode: Speed 10 Realtime, Input: Bosphorus 4K. Linux 6.4.14 was the fastest.

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