linux-kernel - Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts

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Date: Mon, 13 May 2024 07:12:42 -0600
From: Bart Van Assche <bvanassche@....org>
To: Christoph Hellwig <hch@....de>, Keith Busch <kbusch@...a.com>
Cc: linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
 tglx@...utronix.de, ming.lei@...hat.com, Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts

On 5/10/24 08:10, Christoph Hellwig wrote:
> On Fri, May 10, 2024 at 07:14:59AM -0700, Keith Busch wrote:
>> From: Keith Busch <kbusch@...nel.org>
>>
>> Some people _really_ want to control their interrupt affinity.
> 
> So let them argue why.  I'd rather have a really, really, really
> good argument for this crap, and I'd like to hear it from the horses
> mouth.

Performance can be increased by modifying the interrupt assignments
carefully, especially in storage appliances that have to process a
large number of network and storage interrupts. By carefully assigning
interrupts the number of completions processed per interrupt can be
increased and hence performance also increases. In 2014 I was working
on a product that benefited from this approach.

Thanks,

Bart.