linux-kernel - Re: [PATCH bpf-next v3 1/3] xsk: Support UMEM chunk_size > PAGE

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Message-ID: <CAHApi-m4gu8SX_1rBtUwrw+1-Q3ERFEX-HPMcwcCK1OceirwuA@mail.gmail.com>
Date:   Thu, 13 Apr 2023 14:43:32 +0200
From:   Kal Cutter Conley <kal.conley@...tris.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 1/3] xsk: Support UMEM chunk_size > PAGE_SIZE

> Well, you mentioned yourself that:
>
> > The disadvantage of this patchset is requiring the user to allocate
> > HugeTLB pages which is an extra complication.

It's a small extra complication *for the user*. However, users that
need this feature are willing to allocate hugepages. We are one such
user. For us, having to deal with packets split into disjoint buffers
(from the XDP multi-buffer paradigm) is a significantly more annoying
complication than allocating hugepages (particularly on the RX side).