linux-kernel - Re: [PATCH v1 0/4] GPU Direct RDMA (P2P DMA) for Device Private Pages

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Message-ID: <1a667504-72bd-445b-8bf8-a6604b7beb2b@nvidia.com>
Date: Wed, 16 Oct 2024 18:16:28 +0300
From: Yonatan Maman <ymaman@...dia.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-rdma@...r.kernel.org, linux-mm@...ck.org, herbst@...hat.com,
 lyude@...hat.com, dakr@...hat.com, airlied@...il.com, simona@...ll.ch,
 jgg@...pe.ca, leon@...nel.org, jglisse@...hat.com,
 akpm@...ux-foundation.org, dri-devel@...ts.freedesktop.org,
 apopple@...dia.com, bskeggs@...dia.com
Subject: Re: [PATCH v1 0/4] GPU Direct RDMA (P2P DMA) for Device Private Pages



On 16/10/2024 7:23, Christoph Hellwig wrote:
> On Tue, Oct 15, 2024 at 06:23:44PM +0300, Yonatan Maman wrote:
>> From: Yonatan Maman <Ymaman@...dia.com>
>>
>> This patch series aims to enable Peer-to-Peer (P2P) DMA access in
>> GPU-centric applications that utilize RDMA and private device pages. This
>> enhancement is crucial for minimizing data transfer overhead by allowing
>> the GPU to directly expose device private page data to devices such as
>> NICs, eliminating the need to traverse system RAM, which is the native
>> method for exposing device private page data.
> 
> Please tone down your marketing language and explain your factual
> changes.  If you make performance claims back them by numbers.
> 

Got it, thanks! I'll fix that. Regarding performance, we’re achieving 
over 10x higher bandwidth and 10x lower latency using perftest-rdma, 
especially (with a high rate of GPU memory access).