Hi Christian,

On 12/3/2025 11:01 PM, ALOK TIWARI wrote:

Hi,

I’m reporting a performance regression of up to 6% sequential I/O vdbench regression observed on 6.12.y kernel. While running performance benchmarks on v6.12.60 kernel the sequential I/O vdbench metrics are showing a 5-6% performance regression when compared to v6.12.48

Bisect root cause commit

• commit b39b62075ab4 ("cpuidle: menu: Remove iowait influence")

Things work fine again when the previously removed performance- multiplier code is added back.

Test details

The system is connected to a number of disks in disk array using multipathing and directio configuration in the vdbench profile.

wd=wd1,sd=sd*,rdpct=0,seekpct=sequential,xfersize=128k rd=128k64T,wd=wd1,iorate=max,elapsed=600,interval=1,warmup=300,threads=64

Thanks, Alok

Just a gentle ping in case this was missed. Please let us know if we are missing anything or if there are additional things to consider.

Thanks, Alok