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Date:   Sat, 29 Sep 2018 14:54:25 +0200
From:   Stephen Hemminger <>
Cc:     Stephen Hemminger <>,
        Haiyang Zhang <>,
        Eric Dumazet <>
Subject: Re: [PATCH] hv_netvsc: remove ndo_poll_controller

On Sat, 29 Sep 2018 14:52:56 +0200
Stephen Hemminger <> wrote:

> Similar to other patches from ERic.
> As diagnosed by Song Liu, ndo_poll_controller() can
> be very dangerous on loaded hosts, since the cpu
> calling ndo_poll_controller() might steal all NAPI
> contexts (for all RX/TX queues of the NIC). This capture
> can last for unlimited amount of time, since one
> cpu is generally not able to drain all the queues under load.
> In netvsc driver it uses NAPI for TX completions. The default
> poll_napi will do this for us now and avoid the capture.
> Signed-off-by: Stephen Hemminger <>
> Cc: Haiyang Zhang <>
> Cc: Eric Dumazet <>

Forgot to label this, it is for net-next.

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