linux-kernel - Re: [PATCH net v8 0/3] fix packet stuck problem for lockless qdisc

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Date:   Fri, 14 May 2021 10:56:22 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>
CC:     <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>,
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        <alobakin@...me>
Subject: Re: [PATCH net v8 0/3] fix packet stuck problem for lockless qdisc

On 2021/5/14 10:26, Yunsheng Lin wrote:
> This patchset fixes the packet stuck problem mentioned in [1].
> 
> Patch 1: Add STATE_MISSED flag to fix packet stuck problem.
> Patch 2: Fix a tx_action rescheduling problem after STATE_MISSED
>          flag is added in patch 1.
> Patch 3: Fix the significantly higher CPU consumption problem when
>          multiple threads are competing on a saturated outgoing
>          device.
> 
> V8: Change function name in patch 3 as suggested by Jakub, adjust
>     commit log in patch 2, and add Acked-by from Jakub.

Please ignore this patchset, there is some typo in patch 3.

> V7: Fix netif_tx_wake_queue() data race noted by Jakub.
> V6: Some performance optimization in patch 1 suggested by Jakub
>     and drop NET_XMIT_DROP checking in patch 3.
> V5: add patch 3 to fix the problem reported by Michal Kubecek.
> V4: Change STATE_NEED_RESCHEDULE to STATE_MISSED and add patch 2.
> 
> [1]. https://lkml.org/lkml/2019/10/9/42
> 
> Yunsheng Lin (3):
>   net: sched: fix packet stuck problem for lockless qdisc
>   net: sched: fix tx action rescheduling issue during deactivation
>   net: sched: fix tx action reschedule issue with stopped queue
> 
>  include/net/pkt_sched.h   |  7 +------
>  include/net/sch_generic.h | 35 ++++++++++++++++++++++++++++++++-
>  net/core/dev.c            | 29 ++++++++++++++++++++++-----
>  net/sched/sch_generic.c   | 50 +++++++++++++++++++++++++++++++++++++++++++++--
>  4 files changed, 107 insertions(+), 14 deletions(-)
>