linux-kernel - Re: [PATCH net v4 1/2] net: sched: fix packet stuck problem for lockless qdisc

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Date:   Fri, 30 Apr 2021 11:11:55 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Michal Kubecek <mkubecek@...e.cz>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <olteanv@...il.com>,
        <ast@...nel.org>, <daniel@...earbox.net>, <andriin@...com>,
        <edumazet@...gle.com>, <weiwan@...gle.com>,
        <cong.wang@...edance.com>, <ap420073@...il.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>, <mkl@...gutronix.de>,
        <linux-can@...r.kernel.org>, <jhs@...atatu.com>,
        <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <andrii@...nel.org>, <kafai@...com>, <songliubraving@...com>,
        <yhs@...com>, <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <bpf@...r.kernel.org>, <pabeni@...hat.com>, <mzhivich@...mai.com>,
        <johunt@...mai.com>, <albcamus@...il.com>, <kehuan.feng@...il.com>,
        <a.fatoum@...gutronix.de>, <atenart@...nel.org>,
        <alexander.duyck@...il.com>, <hdanton@...a.com>, <jgross@...e.com>,
        <JKosina@...e.com>
Subject: Re: [PATCH net v4 1/2] net: sched: fix packet stuck problem for
 lockless qdisc

On 2021/4/23 17:42, Yunsheng Lin wrote:
> On 2021/4/21 17:25, Yunsheng Lin wrote:
>> On 2021/4/21 16:44, Michal Kubecek wrote:
>>
>>>
>>> I'll try running some tests also on other architectures, including arm64
>>> and s390x (to catch potential endinanity issues).
> 
> I tried debugging nperf in arm64, with the below patch:
>
> Any idea what went wrong here?
> 
> Also, Would you mind running netperf to see if there is similar issue
> in your system?

Hi, Michal
    I was able to reproduce the fluctuation for one thread TCP_STREAM test,
So I am assuming it may more related to test environment or nperf issue.

   I plan to send v5 with netdev queue stopped handling after the golden
holiday in china. If there is any issue with patchset, please let me know,
thanks.

> 
>>>
>>> Michal
>>>
>>> .
>>>
>>
>>
>> .
>>
> 
> 
> .
>