netdev - Re: [net-next 2/2] qdisc: add tracepoint qdisc:qdisc

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Date:   Tue, 13 Jul 2021 10:06:52 +0800
From:   Tonghao Zhang <xiangxia.m.yue@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [net-next 2/2] qdisc: add tracepoint qdisc:qdisc_requeue for
 requeued SKBs

On Mon, Jul 12, 2021 at 12:17 PM Tonghao Zhang <xiangxia.m.yue@...il.com> wrote:
>
> On Mon, Jul 12, 2021 at 11:51 AM Cong Wang <xiyou.wangcong@...il.com> wrote:
> >
> > On Sat, Jul 10, 2021 at 10:00 PM <xiangxia.m.yue@...il.com> wrote:
> > >
> > > From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> > >
> > > The main purpose of this tracepoint is to monitor what,
> > > how many and why packets were requeued. The txq_state can
> > > be used for determining the reason for packets requeued.
> >
> > Hmm, how can I figure out the requeue is caused by
> > validate_xmit_skb_list() when it returns again==true?
Hi cong
Consider this patch again.
The main purpose of this tracepoint is to monitor what, how many and
why packets were requeued.
So should we figure out packets required by validate_xmit_skb_list or
dev_hard_start_xmit ?
because we may want to know what packets were requeued and how many.

if we should figure out, we can add more arg for trace, right ?
> > I fail to see you trace it.
> This patch looks not good.
> > For the other case, we can figure it out by trace_net_dev_xmit().
> > So, in short, your patch looks useless.
> >
> > Thanks.
>
>
>
> --
> Best regards, Tonghao



--
Best regards, Tonghao