netdev - Re: [PATCH net-next 0/2] sched: refactor NOLOCK qdiscs

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Message-Id: <20180517.130645.233025265779233333.davem@davemloft.net>
Date:   Thu, 17 May 2018 13:06:45 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, john.fastabend@...il.com, mst@...hat.com
Subject: Re: [PATCH net-next 0/2] sched: refactor NOLOCK qdiscs

From: Paolo Abeni <pabeni@...hat.com>
Date: Tue, 15 May 2018 16:24:35 +0200

> With the introduction of NOLOCK qdiscs, pfifo_fast performances in the
> uncontended scenario degraded measurably, especially after the commit
> eb82a9944792 ("net: sched, fix OOO packets with pfifo_fast").
> 
> This series restore the pfifo_fast performances in such scenario back the
> previous level, mainly reducing the number of atomic operations required to
> perform the qdisc_run() call. Even performances in the contended scenario
> increase measurably.
> 
> Note: This series is on top of:
> 
> sched: manipulate __QDISC_STATE_RUNNING in qdisc_run_* helpers

Series applied, thank you.