netdev - Re: [Kernel][NET] Bug report on packet defragmenting

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Message-ID: <91b43bec-cb19-b94b-8ee3-26979e3a19d1@gmail.com>
Date:   Wed, 7 Nov 2018 17:43:09 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     soukjin.bae@...sung.com,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [Kernel][NET] Bug report on packet defragmenting

On 11/07/2018 05:29 PM, 배석진 wrote:

> If ipv6_defrag hook is not excuted simultaneously, then it's ok.
> ipv6_defrag hook can handle that. [exam 3]

This seems wrong.

This is the root cause, we should not try to work around it but fix it.

There is no guarantee that RSS/RPS/RFS can help here, packets can sit in per-cpu
backlogs long enough to reproduce the issue, if RX queues interrupts are spread
over many cpus.