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From: "Sorah Fukumori" <her@sorah.jp>
To: "Eric Dumazet" <edumazet@kernel.org>
Cc: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org,
	pabeni@redhat.com, horms@kernel.org, willemb@google.com,
	lixiaoyan@google.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: gro: don't chain linear parts larger than gso_size into frag_list
Date: Tue, 13 Oct 2026 22:00:12 +0900	[thread overview]
Message-ID: <20f75d91-97fd-479d-b3f1-66eaaf493261@app.fastmail.com> (raw)
In-Reply-To: <CAL4WiirpDVzho606z1gt5=1=MFykgTC2CbqdAkxnngSvBYq_Qg@mail.gmail.com>

Hi,

On Tue, 13 Oct 2026, at 8:03 PM, Eric Dumazet wrote:
> It seems an XDP program with frags support in generic mode could
> get there: skb_pp_cow_data() builds a head_frag skb with up to
> about one page of linear data, the rest in page frags, and
> skb_copy_header() keeps the GSO metadata. Two such 64KB packets
> can not share a single frags[] array.
>
> Have you tried this variant with your reproducer ?

Thanks, I haven't. I tried to reproduce that variant under various gro_max_size/RPS configuration, but I couldn't repro on my qemu+veth based script.

Will send out v2 with updated commit message soon, and sorry about missing `net` prefix in the subject, it will be included in v2.

      reply	other threads:[~2026-10-13 13:00 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-13 10:24 Sorah Fukumori
2026-10-13 11:03 ` Eric Dumazet
2026-10-13 13:00   ` Sorah Fukumori [this message]

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