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

["孙魁 (Kui Sun)" <kui.sun@unisoc.com>]

We have already included these two fixes, which are related to stability. The issue we're encountering is performance-related

Thank You.

-----邮件原件-----
发件人: Bart Van Assche <bvanassche@acm.org> 
发送时间: 2026年7月10日 22:56
收件人: 孙魁 (Kui Sun) <kui.sun@unisoc.com>; Neil Armstrong <neil.armstrong@linaro.org>; Alim Akhtar <alim.akhtar@samsung.com>; Avri Altman <avri.altman@wdc.com>; James E.J. Bottomley <James.Bottomley@HansenPartnership.com>; Martin K. Petersen <martin.petersen@oracle.com>; andre.draszik@linaro.org
抄送: Peter Griffin <peter.griffin@linaro.org>; Tudor Ambarus <tudor.ambarus@linaro.org>; Will McVicker <willmcvicker@google.com>; Manivannan Sadhasivam <mani@kernel.org>; kernel-team@android.com; linux-samsung-soc@vger.kernel.org; linux-scsi@vger.kernel.org; linux-kernel@vger.kernel.org; stable@vger.kernel.org; linux-arm-msm@vger.kernel.org; 张如泉 (Rain Zhang) <Rain.Zhang@unisoc.com>; cixi.geng@linux.dev; 唐月林 (Yuelin Tang) <yuelin.tang@unisoc.com>; 陈文超 (Wenchao Chen) <Wenchao.Chen@unisoc.com>; André Draszik <andre.draszik@linaro.org>
主题: 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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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@acm.org>
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@quicinc.com>
Date:   Tue Jul 29 04:27:11 2025 +0530

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

Thanks,

Bart.