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

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Message-ID: <87plnzofah.fsf@nvdebian.thelocal>
Date: Thu, 17 Oct 2024 09:22:19 +1100
From: Alistair Popple <apopple@...dia.com>
To: Yonatan Maman <ymaman@...dia.com>
Cc: Christoph Hellwig <hch@...radead.org>, 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, bskeggs@...dia.com
Subject: Re: [PATCH v1 0/4] GPU Direct RDMA (P2P DMA) for Device Private Pages


Yonatan Maman <ymaman@...dia.com> writes:

> 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).

The performance claims still sound a bit vague. Please make sure you
include actual perftest-rdma performance numbers from before and after
applying this series when you repost.