Seeking for help with NVMe arbitration questions

[Wang Yicheng]

Thanks Chaitanya for confirming!

Given that the kernel module doesn't support configuring device-level
arbitration, I'm now trying to leverage the I/O queues to achieve the
same goal. If you could kindly help with the following questions it
will be much appreciated!

1. Is there a way to query the type of each I/O queue and which CPU it
resides on?

2. Is there a way to control which queue a submitted I/O goes into?

3. Say I have only 1 default queue and I submit an I/O from some CPU,
then there can be a chance that the I/O would need to cross CPUs, if
the default queue happens not to be on the same core right?

Best,
Yicheng

On Tue, Apr 25, 2023 at 10:17 PM Chaitanya Kulkarni
<chaitanyak at nvidia.com> wrote:
>
>
> > 3. I came across this mail thread: https://lwn.net/Articles/810726/,
> > where Weiping was trying to add WRR support in the kernel. But it
> > seems the patch was eventually dropped. Does it mean today the
> > linux-nvme kernel doesn't have WRR support?
> >
> >
>
> no WRR:-
>
> https://www.spinics.net/lists/linux-block/msg51575.html
>
> -ck
>
>