[PATCH v1 06/10] ufs: host: mediatek: Set IRQ affinity policy for MCQ mode

[Peter Wang (王信友)]

On Wed, 2025-07-16 at 08:27 -0700, Bart Van Assche wrote:
> 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> On 7/15/25 11:25 PM, peter.wang at mediatek.com wrote:
> > This patch sets the IRQ affinity for MCQ mode to improve
> > performance. Specifically, it migrates the IRQ from CPU0 to
> > CPU3 to enhance IRQ handling efficiency.
> 
> IRQ affinity can and should be set from userspace.
> 
> Bart.


Hi Bart,

"IRQ affinity can be set from userspace." 
=> This is correct.

"IRQ affinity should be set from userspace." 
=> I have some doubts about this statement.
Is there any documentation that explains this?


As far as I understand,
This depends on the situation. By default, Linux automatically
distributes
IRQs across CPUs, which is sufficient for most systems. However, in
certain high-performance or special-use cases (such as for network
cards
or storage devices), manually setting IRQ affinity can improve
performance or reduce latency.

Thanks.
Peter