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Re: Enabling peer to peer device transactions for PCIe devices

From Logan Gunthorpe <logang@deltatee.com>
Newsgroups linux.kernel
Subject Re: Enabling peer to peer device transactions for PCIe devices
Date 2016-11-25 17:50 +0100
Message-ID <sHrRf-315-7@gated-at.bofh.it> (permalink)
References (9 earlier) <sGOwy-2sG-3@gated-at.bofh.it> <sGP9g-2Vz-25@gated-at.bofh.it> <sH54l-5b9-13@gated-at.bofh.it> <sH6ts-5UY-11@gated-at.bofh.it> <sHrRf-315-9@gated-at.bofh.it>
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On 25/11/16 06:06 AM, Christian König wrote:
> Well Serguei send me a couple of documents about QPI when we started to
> discuss this internally as well and that's exactly one of the cases I
> had in mind when writing this.
> 
> If I understood it correctly for such systems P2P is technical possible,
> but not necessary a good idea. Usually it is faster to just use a
> bouncing buffer when the peers are a bit "father" apart.
> 
> That this problem is solved on newer hardware is good, but doesn't helps
> us at all if we at want to support at least systems from the last five
> years or so.

Well we have been testing with Sandy Bridge, I think the problem was
supposed to be fixed in Ivy but we never tested it so I can't say what
the performance turned out to be. Ivy is nearly 5 years old. I expect
this is something that will be improved more and more with subsequent
generations.

A white list may end up being rather complicated if it has to cover
different CPU generations and system architectures. I feel this is a
decision user space could easily make.

Logan

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Thread

Enabling peer to peer device transactions for PCIe devices "Deucher, Alexander" <Alexander.Deucher@amd.com> - 2016-11-21 21:40 +0100
  Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 19:20 +0100
    Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 21:10 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 21:30 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Daniel Vetter <daniel@ffwll.ch> - 2016-11-22 21:40 +0100
        Re: Enabling peer to peer device transactions for PCIe devices Daniel Vetter <daniel@ffwll.ch> - 2016-11-22 22:20 +0100
          Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 22:30 +0100
            Re: Enabling peer to peer device transactions for PCIe devices "Sagalovitch, Serguei" <Serguei.Sagalovitch@amd.com> - 2016-11-22 23:30 +0100
            Re: Enabling peer to peer device transactions for PCIe devices Daniel Vetter <daniel@ffwll.ch> - 2016-11-23 08:50 +0100
              Re: Enabling peer to peer device transactions for PCIe devices Dave Hansen <dave.hansen@linux.intel.com> - 2016-11-23 18:10 +0100
    Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-23 18:20 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-23 19:50 +0100
        Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 20:20 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 20:10 +0100
        Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 20:40 +0100
          Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 21:40 +0100
            Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-23 22:20 +0100
              Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 23:40 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-23 23:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 00:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 17:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-24 19:00 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-25 17:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices "Sagalovitch, Serguei" <Serguei.Sagalovitch@amd.com> - 2016-11-24 01:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 17:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-24 02:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 17:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-24 19:20 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Christoph Hellwig <hch@infradead.org> - 2016-11-25 09:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-25 20:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-25 20:40 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-25 21:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Alex Deucher <alexdeucher@gmail.com> - 2016-11-26 00:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-25 20:40 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Christian König <deathsimple@vodafone.de> - 2016-11-25 21:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-25 22:20 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-28 18:00 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-28 19:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-28 22:40 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-28 23:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-28 20:10 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-30 17:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-30 19:10 +0100
                Re: Enabling peer to peer device transactions for PCIe devices "Stephen Bates" <sbates@raithlin.com> - 2016-12-04 14:10 +0100
                Re: Enabling peer to peer device transactions for PCIe devices "Stephen Bates" <sbates@raithlin.com> - 2016-12-04 14:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-12-05 18:20 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-12-05 18:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-12-05 19:10 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-12-05 19:40 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-12-05 19:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-12-05 20:20 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-12-05 20:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-12-05 20:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-12-05 21:00 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Christoph Hellwig <hch@infradead.org> - 2016-12-05 21:10 +0100
                Re: Enabling peer to peer device transactions for PCIe devices "Stephen Bates" <sbates@raithlin.com> - 2016-12-06 09:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-12-06 17:40 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-12-06 18:00 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-12-06 18:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-12-06 22:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-12-06 23:10 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Christoph Hellwig <hch@infradead.org> - 2016-12-06 18:20 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-12-05 19:10 +0100
                RE: Enabling peer to peer device transactions for PCIe devices "Deucher, Alexander" <Alexander.Deucher@amd.com> - 2016-11-30 18:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Haggai Eran <haggaie@mellanox.com> - 2016-11-28 21:00 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Haggai Eran <haggaie@mellanox.com> - 2016-11-28 19:40 +0100

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