From: Christoph Hellwig <hch@lst.de>
To: John Garry <john.garry@linux.dev>
Cc: Christoph Hellwig <hch@lst.de>,
kbusch@kernel.org, ahuang12@lenovo.com, sagi@grimberg.me,
linux-nvme@lists.infradead.org, sunjw10@lenovo.com,
iommu@lists.linux.dev
Subject: Re: [PATCH] Revert "nvme-pci: clamp max_hw_sectors based on DMA optimized limitation"
Date: Thu, 8 Oct 2026 14:37:24 +0200 [thread overview]
Message-ID: <20261008123724.GA22096@lst.de> (raw)
In-Reply-To: <8cf8a8ea-c9c9-434b-aec6-e361280a88a4@linux.dev>
On Thu, Oct 08, 2026 at 08:36:54AM +0100, John Garry wrote:
> On 10/6/26 13:02, Christoph Hellwig wrote:
>> This turns down to cause up to 15% performance regressions on standard
>> large transfer workloads. Revert it and hope the IOVA allocator can
>> eventually be fixed to remove the need for the original workaround.
>>
>> This reverts commit 3710e2b056cb92ad816e4d79fa54a6a5b6ad8cbd.
>>
>
> What was the block size and conditions for the original issue? The commit
> just mentions that mdts=10 and we get a 4096KB max HW sectors.
Good question. The original submitter and reporter are on Cc.
next prev parent reply other threads:[~2026-10-08 12:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-06 12:02 [PATCH] Revert "nvme-pci: clamp max_hw_sectors based on DMA optimized limitation" Christoph Hellwig
2026-10-08 7:36 ` John Garry
2026-10-08 12:37 ` Christoph Hellwig [this message]
2026-10-09 9:11 ` [External] " Adrian Huang12
2026-10-09 15:37 ` Keith Busch
2026-10-12 8:42 ` John Garry
2026-10-12 12:17 ` Christoph Hellwig
2026-10-12 14:39 ` John Garry
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