From: Cong Wang <xiyou.wangcong@gmail.com>
To: Jiri Kosina <jikos@kernel.org>
Cc: Hillf Danton <hdanton@sina.com>,
John Fastabend <john.fastabend@gmail.com>,
Paolo Abeni <pabeni@redhat.com>,
Kehuan Feng <kehuan.feng@gmail.com>,
Jike Song <albcamus@gmail.com>,
Jonas Bonn <jonas.bonn@netrounds.com>,
Michael Zhivich <mzhivich@akamai.com>,
David Miller <davem@davemloft.net>,
LKML <linux-kernel@vger.kernel.org>,
Michal Kubecek <mkubecek@suse.cz>,
Netdev <netdev@vger.kernel.org>, Josh Hunt <johunt@akamai.com>,
Yunsheng Lin <linyunsheng@huawei.com>
Subject: Re: Packet gets stuck in NOLOCK pfifo_fast qdisc
Date: Mon, 5 Apr 2021 18:49:58 -0700 [thread overview]
Message-ID: <CAM_iQpU+YD9AcX_77kqmQkqKMuOtnRh5xoGcz9dRRJTe1OnpBQ@mail.gmail.com> (raw)
In-Reply-To: <nycvar.YFH.7.76.2104031420470.12405@cbobk.fhfr.pm>
On Sat, Apr 3, 2021 at 5:23 AM Jiri Kosina <jikos@kernel.org> wrote:
>
> I am still planning to have Yunsheng Lin's (CCing) fix [1] tested in the
> coming days. If it works, then we can consider proceeding with it,
> otherwise I am all for reverting the whole NOLOCK stuff.
>
> [1] https://lore.kernel.org/linux-can/1616641991-14847-1-git-send-email-linyunsheng@huawei.com/T/#u
I personally prefer to just revert that bit, as it brings more troubles
than gains. Even with Yunsheng's patch, there are still some issues.
Essentially, I think the core qdisc scheduling code is not ready for
lockless, just look at those NOLOCK checks in sch_generic.c. :-/
Thanks.
next prev parent reply other threads:[~2021-04-06 1:50 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-09 6:46 Packet gets stuck in NOLOCK pfifo_fast qdisc Jonas Bonn
2019-10-09 19:14 ` Paolo Abeni
2019-10-10 6:27 ` Jonas Bonn
2019-10-11 0:39 ` Jonas Bonn
2020-06-23 13:42 ` Michael Zhivich
2020-06-30 19:14 ` Josh Hunt
2020-07-01 7:53 ` Jonas Bonn
2020-07-01 16:05 ` Cong Wang
2020-07-01 19:58 ` Cong Wang
2020-07-01 22:02 ` Josh Hunt
2020-07-02 6:14 ` Jonas Bonn
2020-07-02 9:45 ` Paolo Abeni
2020-07-02 18:08 ` Josh Hunt
2020-07-07 14:18 ` Paolo Abeni
2020-07-08 20:16 ` Cong Wang
2020-07-09 9:20 ` Paolo Abeni
2020-07-08 20:33 ` Zhivich, Michael
2020-08-20 7:43 ` Jike Song
2020-08-20 18:13 ` Josh Hunt
[not found] ` <20200822032800.16296-1-hdanton@sina.com>
2020-08-25 2:18 ` Fengkehuan Feng
[not found] ` <20200825032312.11776-1-hdanton@sina.com>
2020-08-25 7:14 ` Fengkehuan Feng
[not found] ` <20200825162329.11292-1-hdanton@sina.com>
2020-08-26 2:38 ` Kehuan Feng
[not found] ` <CACS=qqKptAQQGiMoCs1Zgs9S4ZppHhasy1AK4df2NxnCDR+vCw@mail.gmail.com>
[not found] ` <5f46032e.1c69fb81.9880c.7a6cSMTPIN_ADDED_MISSING@mx.google.com>
2020-08-27 6:56 ` Kehuan Feng
[not found] ` <20200827125747.5816-1-hdanton@sina.com>
2020-08-28 1:45 ` Kehuan Feng
2020-09-03 5:01 ` Cong Wang
2020-09-03 8:39 ` Paolo Abeni
2020-09-03 17:43 ` Cong Wang
2020-09-04 5:07 ` John Fastabend
2020-09-10 20:15 ` Cong Wang
2020-09-10 21:07 ` John Fastabend
2020-09-10 21:40 ` Paolo Abeni
2021-04-02 19:25 ` Jiri Kosina
2021-04-02 19:33 ` Josh Hunt
[not found] ` <20210403003537.2032-1-hdanton@sina.com>
2021-04-03 12:23 ` Jiri Kosina
2021-04-06 0:55 ` Yunsheng Lin
2021-04-06 7:06 ` Michal Kubecek
2021-04-06 10:13 ` Juergen Gross
2021-04-06 12:17 ` Yunsheng Lin
2021-04-06 1:49 ` Cong Wang [this message]
2021-04-06 2:46 ` Yunsheng Lin
2021-04-06 7:31 ` Michal Kubecek
2021-04-06 12:24 ` Yunsheng Lin
[not found] ` <20200903101957.428-1-hdanton@sina.com>
2020-09-04 3:20 ` Kehuan Feng
2020-09-10 20:19 ` Cong Wang
2020-09-14 2:10 ` Yunsheng Lin
2020-09-17 19:52 ` Cong Wang
2020-09-18 2:06 ` Kehuan Feng
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