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From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	"roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org"
	<roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"raindel-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org"
	<raindel-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH for-next 9/9] Samples: Peer memory client example
Date: Wed, 1 Oct 2014 21:14:41 -0600	[thread overview]
Message-ID: <20141002031441.GA10386@obsidianresearch.com> (raw)
In-Reply-To: <1828884A29C6694DAF28B7E6B8A8237399DE5096-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>

On Wed, Oct 01, 2014 at 05:16:12PM +0000, Hefty, Sean wrote:
> > Adds an example of a peer memory client which implements the peer memory
> > API as defined under include/rdma/peer_mem.h.
> > It uses the HOST memory functionality to implement the APIs and
> > can be a good reference for peer memory client writers.
> 
> Is there a real user of these changes?

Agreed..

Can you also discuss what is going on at the PCI-E level? How are the
peer-to-peer transactions addressed? Is this elaborate scheme just a
way to 'window' GPU memory or is the NIC sending special PCI-E packets
at the GPU?

I'm really confused why this is all necessary, we can already map
PCI-E memory into user space, and there were much simpler patches
floating around to make that work several years ago..

Jason
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  parent reply	other threads:[~2014-10-02  3:14 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-01 15:18 [PATCH for-next 0/9] Peer-Direct support Yishai Hadas
     [not found] ` <1412176717-11979-1-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-01 15:18   ` [PATCH for-next 1/9] IB/core: Introduce peer client interface Yishai Hadas
     [not found]     ` <1412176717-11979-2-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-01 16:34       ` Bart Van Assche
     [not found]         ` <542C2D23.30508-HInyCGIudOg@public.gmane.org>
2014-10-02 14:37           ` Yishai Hadas
2014-10-01 15:18   ` [PATCH for-next 2/9] IB/core: Get/put peer memory client Yishai Hadas
2014-10-01 15:18   ` [PATCH for-next 3/9] IB/core: Umem tunneling peer memory APIs Yishai Hadas
2014-10-01 15:18   ` [PATCH for-next 4/9] IB/core: Infrastructure to manage peer core context Yishai Hadas
     [not found]     ` <1412176717-11979-5-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-01 22:24       ` Yann Droneaud
     [not found]         ` <1412202261.28184.0.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2014-10-02 15:02           ` Shachar Raindel
2014-10-01 15:18   ` [PATCH for-next 5/9] IB/core: Invalidation support for peer memory Yishai Hadas
     [not found]     ` <1412176717-11979-6-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-01 16:25       ` Yann Droneaud
     [not found]         ` <1412180704.4380.40.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2014-10-02 15:05           ` Shachar Raindel
2014-10-01 15:18   ` [PATCH for-next 6/9] IB/core: Sysfs " Yishai Hadas
     [not found]     ` <1412176717-11979-7-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-02 16:41       ` Jason Gunthorpe
2014-10-01 15:18   ` [PATCH for-next 7/9] IB/mlx4: Invalidation support for MR over " Yishai Hadas
2014-10-01 15:18   ` [PATCH for-next 8/9] IB/mlx5: " Yishai Hadas
2014-10-01 15:18   ` [PATCH for-next 9/9] Samples: Peer memory client example Yishai Hadas
     [not found]     ` <1412176717-11979-10-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-01 17:16       ` Hefty, Sean
     [not found]         ` <1828884A29C6694DAF28B7E6B8A8237399DE5096-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2014-10-02  3:14           ` Jason Gunthorpe [this message]
     [not found]             ` <20141002031441.GA10386-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2014-10-02 13:35               ` Shachar Raindel
2014-10-07 16:57           ` Davis, Arlin R
     [not found]             ` <54347E5A035A054EAE9D05927FB467F977CC9244-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2014-10-07 17:09               ` Hefty, Sean

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