linux-kernel - Re: [PATCH 0/2] Misc fixes on registering PCI NVMe CMB

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Message-ID: <Z70MC0zoC0L-tOgO@kbusch-mbp>
Date: Mon, 24 Feb 2025 17:17:15 -0700
From: Keith Busch <kbusch@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: Icenowy Zheng <uwu@...nowy.me>, Jens Axboe <axboe@...nel.dk>,
	Sagi Grimberg <sagi@...mberg.me>, linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Misc fixes on registering PCI NVMe CMB

On Thu, Feb 13, 2025 at 06:54:49AM +0100, Christoph Hellwig wrote:
> On Thu, Feb 13, 2025 at 01:04:42AM +0800, Icenowy Zheng wrote:
> > Here is a small patchset that is developed during my investigation of
> > a WARNING in my boot kernel log (AMD EPYC 7K62 CPU + Intel DC D4502
> > SSD), which is because of the SSD's too-small CMB block (512KB only).
> 
> Hah, that's certainly and odd CMB configuration.

Should be okay if it's just for submission queues. The driver has an
arbitrary requirement that the queues have at least 64 entries for CMB,
and 512k allows us to create 128 submission queues like that. That's
enough for most systems.