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Date: Fri, 01 Mar 2019 23:07:10 -0800 (PST) From: David Miller <davem@...emloft.net> To: edumazet@...gle.com Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, john.fastabend@...il.com, jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us Subject: Re: [PATCH net] net: sched: put back q.qlen into a single location From: Eric Dumazet <edumazet@...gle.com> Date: Thu, 28 Feb 2019 12:55:43 -0800 > In the series fc8b81a5981f ("Merge branch 'lockless-qdisc-series'") > John made the assumption that the data path had no need to read > the qdisc qlen (number of packets in the qdisc). > > It is true when pfifo_fast is used as the root qdisc, or as direct MQ/MQPRIO > children. > > But pfifo_fast can be used as leaf in class full qdiscs, and existing > logic needs to access the child qlen in an efficient way. ... I'm going to let this sit a bit for review...
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