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Date: Tue, 30 Dec 2014 12:15:01 -0800 From: Cong Wang <cwang@...pensource.com> To: Dennis Chen <kernel.org.gnu@...il.com> Cc: netdev <netdev@...r.kernel.org> Subject: Re: [Question] What's the noop_qdisc introduced for in the kernel? On Tue, Dec 30, 2014 at 1:23 AM, Dennis Chen <kernel.org.gnu@...il.com> wrote: > After google and the code reading, seems this Qdisc instance is only > used for the initialization purpose, I can't find the reason that this > object introduced in the kernel. Does anybody know what the historical > reason is for this invention? the purpose or the benefit for this > Qdisc object? > Not just for initialization, it is kinda a null qdisc when the previous qdisc gets removed: /* ... and graft new one */ if (qdisc == NULL) qdisc = &noop_qdisc; or the entire device is not activated yet. It guarantees no packets can be sent out via this qdisc. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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