linux-kernel - Re: [RFC PATCH v2 1/1] scsi: mpi3mr: Introduce smp_affinity

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Message-ID: <282d9766-ce98-4350-84e9-f6d2d7081408@oracle.com>
Date: Tue, 17 Jun 2025 08:18:42 +0100
From: John Garry <john.g.garry@...cle.com>
To: Aaron Tomlin <atomlin@...mlin.com>, mpi3mr-linuxdrv.pdl@...adcom.com
Cc: kashyap.desai@...adcom.com, sumit.saxena@...adcom.com,
        sreekanth.reddy@...adcom.com, James.Bottomley@...senPartnership.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/1] scsi: mpi3mr: Introduce smp_affinity_enable
 module parameter

On 01/06/2025 02:40, Aaron Tomlin wrote:
> This patch introduces a new module parameter namely
> "smp_affinity_enable", to govern the application of system-wide IRQ
> affinity (with kernel boot-time parameter "irqaffinity") for MSI-X
> interrupts. By default, the default IRQ affinity mask will not be
> respected. Set smp_affinity_enable to 0 disables this behaviour.
> Consequently, preventing the auto-assignment of MSI-X IRQs.

You have given no substantial motivation for this change.

On the cover letter you have, "I noticed that the Linux MegaRAID driver 
for SAS based RAID controllers has the same aforementioned module 
parameter ..." and " I suspect it would be useful ..."