netdev - Re: Regression: [PATCH] mlx4: give precise rx/tx bytes/packets counters

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Date:   Wed, 30 Nov 2016 22:42:35 +0200
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: Regression: [PATCH] mlx4: give precise rx/tx bytes/packets counters

On Wed, Nov 30, 2016 at 7:35 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2016-11-30 at 18:46 +0200, Saeed Mahameed wrote:
>
>> we had/still have the proper stats they are the ones that
>> mlx4_en_fold_software_stats is trying to cache into  (they always
>> exist),
>> but the ones that you are trying to read from (the mlx4 rings) are gone !
>>
>> This bug is totally new and as i warned, this is another symptom of
>> the real root cause (can't sleep while reading stats).
>>
>> Eric what do you suggest ? Keep pre-allocated MAX_RINGS stats  and
>> always iterate over all of them to query stats ?
>> what if you have one ring/none/1K ? how would you know how many to query ?
>
> I am suggesting I will fix the bug I introduced.
>
> Do not panic.
>
>

Not at all, I trust you are the only one who is capable of providing
the best solution.
I am just trying to read your mind :-).

As i said i like the solution and i want to adapt it to mlx5, so I am
a little bit enthusiastic :)

Thanks.