Re: [RFC] Significant Random I/O Performance Regression in Linux Kernel 6.18 (Up to 27.7%) Likely Caused by Commit 3c7ac40d7322

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From: Bart Van Assche

Date: Fri Jul 10 2026 - 10:57:00 EST

On 7/10/26 12:17 AM, 孙魁 (Kui Sun) wrote:

Through investigation, we identified that upstream commit
3c7ac40d732232fec0ba31d0a5e3cc9c112fc2e7, merged in April 2025, is
likely responsible for this performance drop.

Two fixes for that commit are present in the upstream kernel. Are these
fixes present in your kernel tree?

commit eabcac808ca3ee9878223d4b49b750979029016b
Author: Bart Van Assche <bvanassche@xxxxxxx>
Date: Fri Aug 15 08:58:23 2025 -0700

scsi: ufs: core: Fix IRQ lock inversion for the SCSI host lock

commit 034d319c8899e8c5c0a35c6692c7fc7e8c12c374
Author: Nitin Rawat <quic_nitirawa@xxxxxxxxxxx>
Date: Tue Jul 29 04:27:11 2025 +0530

scsi: ufs: core: Fix interrupt handling for MCQ Mode

Thanks,

Bart.