From: Keith Busch <kbusch@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: santhosh kumar <santhu.linux@gmail.com>,
linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Ming Lei <ming.lei@redhat.com>,
x86@kernel.org
Subject: Re: [RFC] PCI_IRQ_AFFINITY limits MSI-X allocation on 384 CPU / 1000+ NVMe system
Date: Thu, 30 Jul 2026 07:28:38 -0600 [thread overview]
Message-ID: <amtRhu7KdGyHIwVf@kbusch-mbp> (raw)
In-Reply-To: <87ldasfwht.ffs@fw13>
On Thu, Jul 30, 2026 at 03:16:46PM +0200, Thomas Gleixner wrote:
> As I told you before it's simple math and resource exhaustion due to the
> way how NVME is implemented and the x86 vector space limitations.
>
> If you want that to behave differently, then you have to talk to the
> NVME people as I told you before.
We can introduce a module parameter to throttle down the maximum number
of IO queues to allocate per controller. I don't think the driver can
automatically reason out what the correct number should be because it
doesn't know how many devices it's going to see.
next prev parent reply other threads:[~2026-07-30 13:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-28 6:42 [RFC] PCI_IRQ_AFFINITY limits MSI-X allocation on 384 CPU / 1000+ NVMe system santhosh kumar
2026-07-28 22:52 ` Thomas Gleixner
2026-07-29 6:29 ` santhosh kumar
2026-07-30 13:16 ` Thomas Gleixner
2026-07-30 13:28 ` Keith Busch [this message]
2026-07-30 19:44 ` Thomas Gleixner
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