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

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Message-ID: <CAHApi-nt+B8wQTDbXYWW+DSi0-MN8smXNqkyCHGOCpwQ2BtFng@mail.gmail.com>
Date:   Wed, 29 Mar 2023 17:40:25 +0200
From:   Kal Cutter Conley <kal.conley@...tris.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     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>,
        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-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/3] xsk: Support UMEM chunk_size > PAGE_SIZE

> can you tell us a bit more about your environment setup - from what i can
> tell mlx4 does not support xdp multi-buffer, so you were testing this
> feature with XDP program attached in generic mode?

This card uses the mlx5 driver. These numbers were taken from a
slightly modified xdpsock example. XDP multi-buffer was not used.

>
> if you were using xdpsock -S or xdpsock -c? or maybe even something
> different?
>
> what was your MTU size on NIC?

I will update the table in the v2 patchset with more information.

Kal