netdev - Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

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Message-ID: <CANn89iK2YaThRzWtcaFRi01FuJ874krD0b5orzVtDqijkdtbvw@mail.gmail.com>
Date:   Tue, 14 Feb 2017 08:03:05 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Tariq Toukan <ttoukan.linux@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        Martin KaFai Lau <kafai@...com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

> Anything _relying_ on order-3 pages being available to impress
> friends/customers is a lie.
>

BTW, you do understand that on PowerPC right now, an Ethernet frame
holds 65536*8 =  half a MByte , right ?

So any PowerPC host using mlx4 NIC can easily be bringed down, by
using a few TCP flows and sending out of order packets.

That is in itself quite scary.