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

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Date:	Wed, 10 Aug 2016 13:06:30 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Jamal Hadi Salim <jhs@...atatu.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 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:
>>
>> This patchset fixes several regressions caused by the previous
>> code refactor. Thanks to Jamal for catching them!
>>
>
> Cong,
>
> Good news: oops gone. I havent done more testing than I did
> before; but looks good so far.
>
> Bad news: You have introduced a performance regression which is
> noticeable at high speed.
>
> 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.

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.

Please try v2, since you have more test cases that I do.
Or it would be great if you can share your test cases with
me or us.

Be patient, every big change could have regression. :)

Thanks.