netdev - Re: pegged softirq and NAPI race (?)

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Date:   Tue, 18 Sep 2018 21:55:58 +0000
From:   Song Liu <songliubraving@...com>
To:     Eric Dumazet <edumazet@...gle.com>
CC:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alexei Starovoitov <ast@...com>,
        netdev <netdev@...r.kernel.org>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        Kernel Team <Kernel-team@...com>
Subject: Re: pegged softirq and NAPI race (?)



> On Sep 18, 2018, at 2:46 PM, Eric Dumazet <edumazet@...gle.com> wrote:
> 
> On Tue, Sep 18, 2018 at 2:41 PM Song Liu <songliubraving@...com> wrote:
>> 
>> 
>> 
>>> 
>> I would submit the patch if Eric prefer not to. :)
> 
> 
> Hmmm.... maybe the bug is really in ixgbe_netpoll()
> 
> This whole ndo_poll_controller() stuff  is crazy.
> 
> All sane implementations should only call napi_schedule()

Current implement is about identical to napi_schedule_irqoff(). Do 
we really need napi_schedule() instead?

On the other hand, I think we should check napi_complete_done() in
ixgbe_poll() anyway. 

Song