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From: Cong Wang <>
To: Tonghao Zhang <>
Cc: Jamal Hadi Salim <>,
	Linux Kernel Network Developers <>
Subject: Re: [net-next 1/2] qdisc: add tracepoint qdisc:qdisc_enqueue for enqueued SKBs
Date: Sun, 11 Jul 2021 11:24:54 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Sat, Jul 10, 2021 at 10:00 PM <> wrote:
> From: Tonghao Zhang <>
> This tracepoint can work with qdisc:qdisc_dequeue to measure
> packets latency in qdisc queue. In some case, for example,
> if TX queues are stopped or frozen, sch_direct_xmit will invoke
> the dev_requeue_skb to requeue SKBs to qdisc->gso_skb, that may
> delay the SKBs in qdisc queue.
> With this patch, we can measure packets latency.

Coincidentally, we have a nearly same patch:

Also, '%p' certainly does not work, it produces same address for
different packets. This is why we changed it to '%px', see:


      parent reply	other threads:[~2021-07-11 18:25 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-11  5:00 xiangxia.m.yue
2021-07-11  5:00 ` [net-next 2/2] qdisc: add tracepoint qdisc:qdisc_requeue for requeued SKBs xiangxia.m.yue
2021-07-12  3:51   ` Cong Wang
2021-07-12  4:17     ` Tonghao Zhang
2021-07-13  2:06       ` Tonghao Zhang
2021-07-15  4:24         ` Cong Wang
2021-07-11 18:24 ` Cong Wang [this message]

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