netdev - Re: Linux 4.12+ memory leak on router with i40e NICs

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Date:   Mon, 16 Oct 2017 16:56:06 -0700
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Paweł Staszewski <pstaszewski@...are.pl>
Cc:     Pavlos Parissis <pavlos.parissis@...il.com>,
        "Anders K. Pedersen | Cohaesio" <akp@...aesio.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "alexander.h.duyck@...el.com" <alexander.h.duyck@...el.com>
Subject: Re: Linux 4.12+ memory leak on router with i40e NICs

On Mon, Oct 16, 2017 at 4:34 PM, Paweł Staszewski <pstaszewski@...are.pl> wrote:
>
>
> W dniu 2017-10-16 o 18:26, Paweł Staszewski pisze:
>
>>
>>
>> W dniu 2017-10-16 o 13:20, Pavlos Parissis pisze:
>>>
>>> On 15/10/2017 02:58 πμ, Alexander Duyck wrote:
>>>>
>>>> Hi Pawel,
>>>>
>>>> To clarify is that Dave Miller's tree or Linus's that you are talking
>>>> about? If it is Dave's tree how long ago was it you pulled it since I
>>>> think the fix was just pushed by Jeff Kirsher a few days ago.
>>>>
>>>> The issue should be fixed in the following commit:
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/drivers/net/ethernet/intel/i40e/i40e_txrx.c?id=2b9478ffc550f17c6cd8c69057234e91150f5972
>>>>
>>>
>>> Do you know when it is going to be available on net-next and linux-stable
>>> repos?
>>>
>>> Cheers,
>>> Pavlos
>>>
>>>
>> I will make some tests today night with "net" git tree where this patch is
>> included.
>> Starting from 0:00 CET
>> :)
>>
>>
> Upgraded and looks like problem is not solved with that patch
> Currently running system with
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/
> kernel
>
> Still about 0.5GB of memory is leaking somewhere
>
> Also can confirm that the latest kernel where memory is not leaking (with
> use i40e driver intel 710 cards) is 4.11.12
> With kernel 4.11.12 - after hour no change in memory usage.
>
> also checked that with ixgbe instead of i40e with same  net.git kernel there
> is no memleak - after hour same memory usage - so for 100% this is i40e
> driver problem.

So how long was the run to get the .5GB of memory leaking?

Also is there any chance of you being able to bisect to determine
where the memory leak was introduced since as you pointed out it
didn't exist in 4.11.12 so odds are it was introduced somewhere
between 4.11 and the latest kernel release.

Thanks.

- Alex