From: Keith Busch <kbusch@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <kbusch@meta.com>, linux-nvme@lists.infradead.org
Subject: Re: [PATCH] nvme: uring_cmd specific request_queue for SGLs
Date: Fri, 27 Jun 2025 09:34:56 -0600 [thread overview]
Message-ID: <aF66IGSMATG9-sLy@kbusch-mbp> (raw)
In-Reply-To: <20250627072524.GA1329@lst.de>
On Fri, Jun 27, 2025 at 09:25:24AM +0200, Christoph Hellwig wrote:
>
> Oh, you are referring to blk_dma_map_direct?
Yes, exactly. Sorry I shortened the name to the ambiguous "direct", but
I think we're on the same page now.
Back to this patch, I get that this uring_cmd path wouldn't be able to
use the more efficient coalesced mapping when the IOMMU is on, and
instead map each segment indiviually. I think that's still better than
the alternative, though.
next prev parent reply other threads:[~2025-06-27 16:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-24 21:14 [PATCH] nvme: uring_cmd specific request_queue for SGLs Keith Busch
2025-06-25 6:09 ` Christoph Hellwig
2025-06-25 22:08 ` Keith Busch
2025-06-26 5:14 ` Christoph Hellwig
2025-06-26 15:29 ` Keith Busch
2025-06-27 7:25 ` Christoph Hellwig
2025-06-27 15:34 ` Keith Busch [this message]
2025-06-30 6:00 ` Christoph Hellwig
2025-06-30 14:04 ` Keith Busch
2025-07-01 6:16 ` Christoph Hellwig
2025-07-01 12:15 ` Keith Busch
2025-07-01 14:35 ` Keith Busch
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