netdev - Re: [PATCH net v1] net/sched: Don't print dump stack in event of transmission timeout

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Date:   Mon, 13 Apr 2020 10:22:33 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Leon Romanovsky <leonro@...lanox.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net v1] net/sched: Don't print dump stack in event of
 transmission timeout

On Sat, Apr 11, 2020 at 11:09 PM Leon Romanovsky <leon@...nel.org> wrote:
>
> From: Leon Romanovsky <leonro@...lanox.com>
>
> In event of transmission timeout, the drivers are given an opportunity
> to recover and continue to work after some in-house cleanups.
>
> Such event can be caused by HW bugs, wrong congestion configurations
> and many more other scenarios. In such case, users are interested to
> get a simple  "NETDEV WATCHDOG ... " print, which points to the relevant
> netdevice in trouble.
>
> The dump stack printed later was added in the commit b4192bbd85d2
> ("net: Add a WARN_ON_ONCE() to the transmit timeout function") to give
> extra information, like list of the modules and which driver is involved.
>
> While the latter is already printed in "NETDEV WATCHDOG ... ", the list
> of modules rarely needed and can be collected later.
>
> So let's remove the WARN_ONCE() and make dmesg look more user-friendly in
> large cluster setups.
...
>
> Fixes: b4192bbd85d2 ("net: Add a WARN_ON_ONCE() to the transmit timeout function")
> Signed-off-by: Leon Romanovsky <leonro@...lanox.com>

Acked-by: Cong Wang <xiyou.wangcong@...il.com>

Thanks.