[PATCHv2] nvme-pci: allow unmanaged interrupts

[Ming Lei]

On Sun, May 12, 2024 at 05:16:13PM +0300, Sagi Grimberg wrote:
> 
> > > Everyone expects nvme performance will suffer. IO latency and CPU
> > > efficieny are not everyone's top priority, so allowing people to
> > > optimize for something else seems like a reasonable request.
> > I guess more people may be interested in 'something else', care to share
> > them in the commit log, cause nvme is going to support it.
> 
> I don't have a special interest in this, but I can share what I heard
> several
> times. The use-case is that people want to dedicate a few cores to handle
> interrupts so they know it does not take cpu time from their application
> threads
> that are running (usually pinned to different cores).
> 
> The app threads isolation is more important to them than affinity to the
> device...

That is exactly what CPU isolation is doing, include 'isolcpus=managed_irq',
isn't it?

Thanks, 
Ming