From: jianghaoran <jianghaoran@kylinos.cn>
To: Jakub Kicinski <kuba@kernel.org>
Cc: vinicius.gomes@intel.com, jhs@mojatatu.com, jiri@resnulli.us,
davem@davemloft.net, edumazet@google.com, pabeni@redhat.com,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
vladimir.oltean@nxp.com
Subject: Re: [PATCH] taprio: Set the value of picos_per_byte before fill sched_entry
Date: Sat, 1 Oct 2022 08:44:56 +0800 [thread overview]
Message-ID: <75394e2d-7923-0991-91ad-089c9c9829ef@kylinos.cn> (raw)
In-Reply-To: <7b707ba4-c3f2-dd17-e3f2-e4d143b76245@kylinos.cn>
在 2022/10/1 上午8:42, jianghaoran 写道:
>
> 在 2022/9/30 上午10:18, Jakub Kicinski 写道:
>> On Wed, 28 Sep 2022 14:58:30 +0800 jianghaoran wrote:
>>> If the value of picos_per_byte is set after fill sched_entry,
>>> as a result, the min_duration calculated by length_to_duration is 0,
>>> and the validity of the input interval cannot be judged,
>>> too small intervals couldn't allow any packet to be transmitted.
>>
>> Meaning an invalid configuration is accepted but no packets
>> can ever be transmitted? Could you make the user-visible
>> issue clearer?
>
> Yes, It's possible that the user specifies an too small interval that
> couldn't allow any packet to be transmitted.According to the following example,
> the interval is set to 9, and the network port enp5s0f0 cannot send any
> data
>
>>> It will appear like commit b5b73b26b3ca ("taprio:
>>> Fix allowing too small intervals") described problem.
>>> Here is a further modification of this problem.
>>>
>>> example:
>>
>> Here as well it seems worthwhile to mention what this is an example of.
>> e.g. "example configuration which will not be able to transmit packets"
>>
>>> tc qdisc replace dev enp5s0f0 parent root handle 100 taprio \
>>> num_tc 3 \
>>> map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
>>> queues 1@0 1@1 2@2 \
>>> base-time 1528743495910289987 \
>>> sched-entry S 01 9 \
>>> sched-entry S 02 9 \
>>> sched-entry S 04 9 \
>>> clockid CLOCK_TAI
>>
>> Please add a Fixes tag pointing to the first commit where the issue was
>> present, and CC Vladimir Oltean <vladimir.oltean@nxp.com> on the next
>> version.
>>
> Thank you for your suggestion. I will modify it as suggested
next prev parent reply other threads:[~2022-10-01 0:48 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-28 6:58 [PATCH] taprio: Set the value of picos_per_byte before fill sched_entry jianghaoran
2022-09-30 2:18 ` Jakub Kicinski
2022-09-30 11:18 ` jianghaoran
2022-09-30 13:46 ` jianghaoran
2022-09-30 13:58 ` test jianghaoran
2022-09-30 14:16 ` [PATCH] taprio: Set the value of picos_per_byte before fill sched_entry jianghaoran
2022-10-01 0:42 ` jianghaoran
2022-10-01 0:44 ` jianghaoran [this message]
2022-10-01 0:49 ` jianghaoran
2022-10-01 0:57 ` jianghaoran
2022-10-01 0:59 ` jianghaoran
2022-10-01 1:10 ` jianghaoran
2022-10-01 1:17 ` jianghaoran
2022-10-01 1:23 ` jianghaoran
2022-10-01 7:48 ` [PATCH V2] " jianghaoran
2022-10-01 7:51 ` jianghaoran
2022-10-01 7:51 ` jianghaoran
2022-10-01 7:53 ` jianghaoran
2022-10-01 8:00 ` jianghaoran
2022-10-01 8:06 ` jianghaoran
2022-10-01 11:44 ` Vladimir Oltean
2022-10-03 15:08 ` Jakub Kicinski
2022-10-01 8:29 ` jianghaoran
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