Re: [PATCH 5/7] x86: remove the experimental forcesac boot option
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- To: Christoph Hellwig <hch@xxxxxx>
- Subject: Re: [PATCH 5/7] x86: remove the experimental forcesac boot option
- From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- Date: Mon, 28 May 2018 08:07:57 +0200 (CEST)
- Cc: Ingo Molnar <mingo@xxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx
- In-reply-to: <20180525143512.1466-6-hch@lst.de>
- References: <20180525143512.1466-1-hch@lst.de> <20180525143512.1466-6-hch@lst.de>
- User-agent: Alpine 2.21 (DEB 202 2017-01-01)
On Fri, 25 May 2018, Christoph Hellwig wrote:
x86/pci-dma: ...
Please
> Limiting the dma mask to avoid PCI (pre-PCIe) DAC cycles while paying
> the huge overhead of an IOMMU is rather pointless, and this seriously
> gets in the way of dma mapping work.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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