netdev - Re: [PATCH V1 net-next 00/12] Improving performance and reducing latencies, by using latest capabilities exposed in ENA device

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Message-ID: <1539119909353.25034@amazon.com>
Date:   Tue, 9 Oct 2018 21:18:30 +0000
From:   "Bshara, Saeed" <saeedb@...zon.com>
To:     "Bshara, Nafea" <nafea@...zon.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        "Kiyanovski, Arthur" <akiyano@...zon.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        "Machulsky, Zorik" <zorik@...zon.com>,
        "Matushevsky, Alexander" <matua@...zon.com>,
        "Wilson, Matt" <msw@...zon.com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        "Tzalik, Guy" <gtzalik@...zon.com>,
        "Belgazal, Netanel" <netanel@...zon.com>,
        "Saidi, Ali" <alisaidi@...zon.com>,
        Björn Töpel <bjorn.topel@...el.com>
Subject: Re: [PATCH V1 net-next 00/12] Improving performance and reducing
 latencies, by using latest capabilities exposed in ENA device


Jesper,
currently the driver allocate page per rx buffer, but we are considering to support mode where page split to 2 buffers in order to overcome memory fragmentation issue on low memory systems. but, this won't work with XDP, right?
what's your advice?



From: Bshara, Nafea
Sent: Tuesday, October 9, 2018 10:33 PM
To: Jesper Dangaard Brouer; Kiyanovski, Arthur
Cc: davem@...emloft.net; netdev@...r.kernel.org; Woodhouse, David; Machulsky, Zorik; Matushevsky, Alexander; Bshara, Saeed; Wilson, Matt; Liguori, Anthony; Tzalik, Guy; Belgazal, Netanel; Saidi, Ali; Björn Töpel
Subject: Re: [PATCH V1 net-next 00/12] Improving performance and reducing latencies, by using latest capabilities exposed in ENA device
    
It is high priority for us right after this major release get merged.

On 10/9/18, 12:31 PM, "Jesper Dangaard Brouer" <brouer@...hat.com> wrote:

    
    On Tue, 9 Oct 2018 21:44:57 +0300 <akiyano@...zon.com> wrote:
    
    > From: Arthur Kiyanovski <akiyano@...zon.com>
    > 
    > This patchset introduces the following:
    > 1. A new placement policy of Tx headers and descriptors, which takes
    > advantage of an option to place headers + descriptors in device memory
    > space. This is sometimes referred to as LLQ - low latency queue.
    > The patch set defines the admin capability, maps the device memory as
    > write-combined, and adds a mode in transmit datapath to do header +
    > descriptor placement on the device.
    > 2. Support for RX checksum offloading
    > 3. Miscelaneous small improvements and code cleanups
    
    What are your plans for XDP?
    
    You are unsure ask your-colleague David Woodhouse, who I've discussed
    this with when he attended my talk at Kernel-Recipes[1], slide[2].
    
    [1]  https://kernel-recipes.org/en/2018/talks/xdp-a-new-programmable-network-layer/
    [2]  http://people.netfilter.org/hawk/presentations/KernelRecipes2018/XDP_Kernel_Recipes_2018.pdf
    -- 
    Best regards,
      Jesper Dangaard Brouer
      MSc.CS, Principal Kernel Engineer at Red Hat
      LinkedIn: http://www.linkedin.com/in/brouer