netdev - Re: [Patch net 0/5] net_sched: tc action fixes and updates

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Date:	Sat, 13 Aug 2016 07:05:00 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [Patch net 0/5] net_sched: tc action fixes and updates

On 16-08-11 08:08 PM, Cong Wang wrote:
> On Thu, Aug 11, 2016 at 9:20 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
>> On 16-08-10 04:06 PM, Cong Wang wrote:
>>>
>>> On Wed, Aug 10, 2016 at 7:34 AM, Jamal Hadi Salim <jhs@...atatu.com>
>>> wrote:
>>>>
>>>> On 16-08-08 04:46 PM, Cong Wang wrote:
>>
>>
>>>> tcf_exts_exec() is the culprit - and conversion to from flexarray
>>>> to linked list in the fast problem to be specific.
>>>
>>>
>>> Ah, this reminds me that I don't have to use flex_array, initially
>>> I thought the tcf_exts could hold as many actions as it wants,
>>> but actually there is a upper bound, TCA_ACT_MAX_PRIO.
>>> IOW, a regular dynamic array is just enough here.
>>>
>>
>> Yes, a regular array would be enough.
>>
>>
>>> I just replaced the flex_array with a regular one, it works fine
>>> for me too, at least no crash with all of my test cases.
>>>
>>
>
>> No problem Cong - except we have a kernel that crashes right now.
>> BTW: I just thought of another test which uses a different code
>> path
>> # add a policer rule
>> sudo $TC actions add action police rate 1kbit burst 90k drop
>> #dump rules..
>> sudo $TC -s actions ls action police
>>
>

I tested a lot more this time.
Good news: performance regression now resolved.
Some bad news - there's still one more oops:

sudo $TC actions add action police rate 1kbit burst 90k drop index 1

note how i explicitly specified the index.
If i leave out the index, all works fine. I'll continue to see
if there are any other issue for the next while and will email.
I think you are close so  I will also make small comments on the
patches because you are going to make another update.

cheers,
jamal