From: Eric Pilmore <epilmore@gigaio.com>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: Kit Chow <kchow@gigaio.com>, Bjorn Helgaas <helgaas@kernel.org>,
linux-pci@vger.kernel.org, David Woodhouse <dwmw2@infradead.org>,
Alex Williamson <alex.williamson@redhat.com>,
iommu@lists.linux-foundation.org
Subject: Re: IOAT DMA w/IOMMU
Date: Tue, 21 Aug 2018 16:59:08 -0700 [thread overview]
Message-ID: <CAOQPn8unksJgKiG2fnJf8u6K8wOcC10MKBvAsKpZs+fDrVsOQg@mail.gmail.com> (raw)
In-Reply-To: <b62adad7-6f39-8bb2-9aca-258cbf909d4d@deltatee.com>
On Tue, Aug 21, 2018 at 4:53 PM, Logan Gunthorpe <logang@deltatee.com> wrote:
>
> CPUs don't always have good support for routing PCI P2P transactions.
> However, I would have expected a relatively new i7 CPU to support it
> well. It may simply be that this CPU does not have good support, however
> that comes as a bit of a surprise to me. Our plans for the P2P
> patch-set was to have a white-list for CPUs that work.
>
> If you can, it would be worth hooking up a PCI analyzer to see what's
> happening to the TLPs in both cases.
We do have one, but it will be a bit of a logistical effort to get it set-up
in this config. Will be a while before I can gather that data. Will forward
along when I do.
Thanks,
Eric
next prev parent reply other threads:[~2018-08-21 23:59 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-09 18:14 IOAT DMA w/IOMMU Eric Pilmore
2018-08-09 18:43 ` Bjorn Helgaas
2018-08-09 18:51 ` Eric Pilmore
2018-08-09 19:35 ` Logan Gunthorpe
2018-08-09 19:47 ` Kit Chow
2018-08-09 20:11 ` Logan Gunthorpe
2018-08-09 20:57 ` Kit Chow
2018-08-09 21:11 ` Logan Gunthorpe
2018-08-09 21:47 ` Kit Chow
2018-08-09 22:40 ` Jiang, Dave
2018-08-09 22:48 ` Kit Chow
2018-08-09 22:50 ` Logan Gunthorpe
2018-08-09 23:00 ` Kit Chow
2018-08-10 16:02 ` Kit Chow
2018-08-10 16:23 ` Kit Chow
2018-08-10 16:24 ` Logan Gunthorpe
2018-08-10 16:24 ` Logan Gunthorpe
2018-08-10 16:31 ` Dave Jiang
2018-08-10 16:33 ` Logan Gunthorpe
2018-08-10 17:01 ` Dave Jiang
2018-08-10 17:15 ` Logan Gunthorpe
2018-08-10 17:46 ` Dave Jiang
2018-08-11 0:53 ` Kit Chow
2018-08-11 2:10 ` Logan Gunthorpe
2018-08-13 14:23 ` Kit Chow
2018-08-13 14:59 ` Robin Murphy
2018-08-13 15:21 ` Kit Chow
2018-08-13 23:30 ` Kit Chow
2018-08-13 23:39 ` Logan Gunthorpe
2018-08-13 23:48 ` Kit Chow
2018-08-13 23:50 ` Logan Gunthorpe
2018-08-14 13:47 ` Kit Chow
2018-08-14 14:03 ` Robin Murphy
2018-08-13 23:36 ` Kit Chow
2018-08-09 21:31 ` Eric Pilmore
2018-08-09 21:36 ` Logan Gunthorpe
2018-08-16 17:16 ` Kit Chow
2018-08-16 17:21 ` Logan Gunthorpe
2018-08-16 18:53 ` Kit Chow
2018-08-16 18:56 ` Logan Gunthorpe
2018-08-21 23:18 ` Eric Pilmore
2018-08-21 23:20 ` Logan Gunthorpe
2018-08-21 23:28 ` Eric Pilmore
2018-08-21 23:35 ` Logan Gunthorpe
2018-08-21 23:45 ` Eric Pilmore
2018-08-21 23:53 ` Logan Gunthorpe
2018-08-21 23:59 ` Eric Pilmore [this message]
2018-08-21 23:30 ` Eric Pilmore
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