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Message-ID: <ZzTqgXqjN4UrT392@kbusch-mbp>
Date: Wed, 13 Nov 2024 11:05:53 -0700
From: Keith Busch <kbusch@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: Bob Beckett <bob.beckett@...labora.com>, Jens Axboe <axboe@...nel.dk>,
	Sagi Grimberg <sagi@...mberg.me>, kernel@...labora.com,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme-pci: 512 byte aligned dma pool segment quirk

On Wed, Nov 13, 2024 at 05:31:51AM +0100, Christoph Hellwig wrote:
> On Tue, Nov 12, 2024 at 07:50:00PM +0000, Bob Beckett wrote:
> > From: Robert Beckett <bob.beckett@...labora.com>
> > 
> > We initially put in a quick fix of limiting the queue depth to 1
> > as experimentation showed that it fixed data corruption on 64GB
> > steamdecks.
> > 
> > After further experimentation, it appears that the corruption
> > is fixed by aligning the small dma pool segments to 512 bytes.
> > Testing via desync image verification shows that it now passes
> > thousands of verification loops, where previously
> > it never managed above 7.
> 
> As suggested before, instead of changing the pool size please just
> always use the large pool for this device.

Well, he's doing what I suggested. I thought this was better because it
puts the decision making in the initialization path instead of the IO
path.

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