From: Jason Gunthorpe <jgg@ziepe.ca>
To: fengchengwen <fengchengwen@huawei.com>
Cc: Zhiping Zhang <zhipingz@meta.com>,
Leon Romanovsky <leon@kernel.org>,
Michael Guralnik <michaelgur@nvidia.com>,
Sumit Semwal <sumit.semwal@linaro.org>,
Christian Konig <christian.koenig@amd.com>,
Alex Williamson <alex@shazbot.org>,
Bjorn Helgaas <bhelgaas@google.com>,
kvm@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v12 0/4] vfio/dma-buf: add TPH support for peer-to-peer access
Date: Thu, 16 Jul 2026 11:47:08 -0300 [thread overview]
Message-ID: <20260716144708.GD210048@ziepe.ca> (raw)
In-Reply-To: <7dd5c995-a23c-4d3a-9ba0-7fc77972339f@huawei.com>
On Thu, Jul 16, 2026 at 09:07:35AM +0800, fengchengwen wrote:
> Because cross-Root-Port P2P traffic with ST does not affect the host, but
> merely the completer may experience some performance degradation because
> it lacks the TPH hint. In this case, I suggest adding restrictions in the
> uAPI.
I don't think this is complexity is worth doing for something that has
no functional impact.
There is no difference between supplying the TPH and not supplying it,
so may as well supply it.
Jason
prev parent reply other threads:[~2026-07-16 14:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20260715204008.3911275-1-zhipingz@meta.com>
2026-07-16 1:07 ` [PATCH v12 0/4] vfio/dma-buf: add TPH support for peer-to-peer access fengchengwen
2026-07-16 14:47 ` Jason Gunthorpe [this message]
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